diff --git a/doc/examples/README.cpp b/doc/examples/README.cpp
index a424e1958..b928e1167 100644
--- a/doc/examples/README.cpp
+++ b/doc/examples/README.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/README.link b/doc/examples/README.link
index dab9343fb..62671439b 100644
--- a/doc/examples/README.link
+++ b/doc/examples/README.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/vsDHoEGWuGiwM0oh"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/y0porRuf7gTGQrIn"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/array.cpp b/doc/examples/array.cpp
index 106c47a16..3ec0a133b 100644
--- a/doc/examples/array.cpp
+++ b/doc/examples/array.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/array.link b/doc/examples/array.link
index 2fa5d1dc2..626dcd25c 100644
--- a/doc/examples/array.link
+++ b/doc/examples/array.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/NeN8wmHsQGxFXC6L"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/TTykAqoDgbLzKxt3"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/at__object_t_key_type.cpp b/doc/examples/at__object_t_key_type.cpp
index 29c24c0ce..a8fc9998c 100644
--- a/doc/examples/at__object_t_key_type.cpp
+++ b/doc/examples/at__object_t_key_type.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/at__object_t_key_type.link b/doc/examples/at__object_t_key_type.link
index beba6a0fb..f7e44b204 100644
--- a/doc/examples/at__object_t_key_type.link
+++ b/doc/examples/at__object_t_key_type.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/3ir8W1OZ5KtbRz6r"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/wjOUJUwo2SO7q5u8"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/at__object_t_key_type_const.cpp b/doc/examples/at__object_t_key_type_const.cpp
index 4a3355276..0686db45e 100644
--- a/doc/examples/at__object_t_key_type_const.cpp
+++ b/doc/examples/at__object_t_key_type_const.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/at__object_t_key_type_const.link b/doc/examples/at__object_t_key_type_const.link
index 59ff8a90a..8ba211662 100644
--- a/doc/examples/at__object_t_key_type_const.link
+++ b/doc/examples/at__object_t_key_type_const.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/zwOKkXrKstDlMPjr"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/7gGtalpuoF4xE7VN"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/at__size_type.cpp b/doc/examples/at__size_type.cpp
index 617485bf0..e31d61d35 100644
--- a/doc/examples/at__size_type.cpp
+++ b/doc/examples/at__size_type.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/at__size_type.link b/doc/examples/at__size_type.link
index a5ce10e4d..76a409c20 100644
--- a/doc/examples/at__size_type.link
+++ b/doc/examples/at__size_type.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/9Ae4DO4HJjULnq5j"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/Sa6XYQS7TJ5sGG8a"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/at__size_type_const.cpp b/doc/examples/at__size_type_const.cpp
index 8c4324d48..a8a43ed8f 100644
--- a/doc/examples/at__size_type_const.cpp
+++ b/doc/examples/at__size_type_const.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/at__size_type_const.link b/doc/examples/at__size_type_const.link
index 663ee72e3..5a1cdde95 100644
--- a/doc/examples/at__size_type_const.link
+++ b/doc/examples/at__size_type_const.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/Ti47m4DY2lV4SWNV"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/PGQOjyIV7s5YnsQM"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/back.cpp b/doc/examples/back.cpp
index 581d376d6..20a2ecb69 100644
--- a/doc/examples/back.cpp
+++ b/doc/examples/back.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/back.link b/doc/examples/back.link
index 98bca5fe6..1e0751335 100644
--- a/doc/examples/back.link
+++ b/doc/examples/back.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/zB9tSkSVYIthfgj6"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/M9xQVJJLTE1qvTtm"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/basic_json.cpp b/doc/examples/basic_json.cpp
index ceb47c5e4..0f36e4f84 100644
--- a/doc/examples/basic_json.cpp
+++ b/doc/examples/basic_json.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/basic_json.link b/doc/examples/basic_json.link
index f623a3cfa..1625c487a 100644
--- a/doc/examples/basic_json.link
+++ b/doc/examples/basic_json.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/Hrajl95QUa1Lplou"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/mSAAr3GATT6ciVjV"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/basic_json__CompatibleArrayType.cpp b/doc/examples/basic_json__CompatibleArrayType.cpp
index e63529b64..bbbf5970c 100644
--- a/doc/examples/basic_json__CompatibleArrayType.cpp
+++ b/doc/examples/basic_json__CompatibleArrayType.cpp
@@ -5,7 +5,7 @@
 #include <set>
 #include <unordered_set>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/basic_json__CompatibleArrayType.link b/doc/examples/basic_json__CompatibleArrayType.link
index 52e8cae9a..313ae3fed 100644
--- a/doc/examples/basic_json__CompatibleArrayType.link
+++ b/doc/examples/basic_json__CompatibleArrayType.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/vyrjruntW4ASDBKH"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/InYach9gNBDvA8QR"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/basic_json__CompatibleIntegerNumberType.cpp b/doc/examples/basic_json__CompatibleIntegerNumberType.cpp
index 7f6eb45dc..50e751d11 100644
--- a/doc/examples/basic_json__CompatibleIntegerNumberType.cpp
+++ b/doc/examples/basic_json__CompatibleIntegerNumberType.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/basic_json__CompatibleIntegerNumberType.link b/doc/examples/basic_json__CompatibleIntegerNumberType.link
index c1dba478f..f994babb3 100644
--- a/doc/examples/basic_json__CompatibleIntegerNumberType.link
+++ b/doc/examples/basic_json__CompatibleIntegerNumberType.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/cyithYO7sPbXxK16"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/VDu3HkQPf0Rv5dzH"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/basic_json__CompatibleNumberFloatType.cpp b/doc/examples/basic_json__CompatibleNumberFloatType.cpp
index 73adf78ee..6f8d3f67a 100644
--- a/doc/examples/basic_json__CompatibleNumberFloatType.cpp
+++ b/doc/examples/basic_json__CompatibleNumberFloatType.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/basic_json__CompatibleNumberFloatType.link b/doc/examples/basic_json__CompatibleNumberFloatType.link
index aa10ad21a..9e08b6a64 100644
--- a/doc/examples/basic_json__CompatibleNumberFloatType.link
+++ b/doc/examples/basic_json__CompatibleNumberFloatType.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/yO6SWuP9bEYvNEvX"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/BjDrTHvJMwFC3iLr"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/basic_json__CompatibleObjectType.cpp b/doc/examples/basic_json__CompatibleObjectType.cpp
index 8aa0dc735..d284b697b 100644
--- a/doc/examples/basic_json__CompatibleObjectType.cpp
+++ b/doc/examples/basic_json__CompatibleObjectType.cpp
@@ -1,7 +1,7 @@
 #include <json.hpp>
 #include <unordered_map>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/basic_json__CompatibleObjectType.link b/doc/examples/basic_json__CompatibleObjectType.link
index 3fe8de3a4..6d65b17a4 100644
--- a/doc/examples/basic_json__CompatibleObjectType.link
+++ b/doc/examples/basic_json__CompatibleObjectType.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/FCiYtNwovQ84DWxl"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/ZJz4SFD4Iuy8OS4T"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/basic_json__CompatibleStringType.cpp b/doc/examples/basic_json__CompatibleStringType.cpp
index d9dc181a8..a0f3b4f67 100644
--- a/doc/examples/basic_json__CompatibleStringType.cpp
+++ b/doc/examples/basic_json__CompatibleStringType.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/basic_json__CompatibleStringType.link b/doc/examples/basic_json__CompatibleStringType.link
index 88406aed3..2131a163b 100644
--- a/doc/examples/basic_json__CompatibleStringType.link
+++ b/doc/examples/basic_json__CompatibleStringType.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/h8c1hfORMnVrJ1Ky"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/Fe1WNG7eJRaWYMM4"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/basic_json__InputIt_InputIt.cpp b/doc/examples/basic_json__InputIt_InputIt.cpp
index a1fe0e5a5..86a0faf8c 100644
--- a/doc/examples/basic_json__InputIt_InputIt.cpp
+++ b/doc/examples/basic_json__InputIt_InputIt.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/basic_json__InputIt_InputIt.link b/doc/examples/basic_json__InputIt_InputIt.link
index 6945986e0..3ce3686ad 100644
--- a/doc/examples/basic_json__InputIt_InputIt.link
+++ b/doc/examples/basic_json__InputIt_InputIt.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/z2P1DpA8uSSlwgTl"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/Ulv0RYN6QoJ6ECVR"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/basic_json__array_t.cpp b/doc/examples/basic_json__array_t.cpp
index 641c56e0f..1bb6931b2 100644
--- a/doc/examples/basic_json__array_t.cpp
+++ b/doc/examples/basic_json__array_t.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/basic_json__array_t.link b/doc/examples/basic_json__array_t.link
index 6ea8193b6..53322832d 100644
--- a/doc/examples/basic_json__array_t.link
+++ b/doc/examples/basic_json__array_t.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/vwVgsv7w6YZUgctJ"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/T5FlYwVpQ1oXBuBH"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/basic_json__basic_json.cpp b/doc/examples/basic_json__basic_json.cpp
index c61827e94..28f1fd072 100644
--- a/doc/examples/basic_json__basic_json.cpp
+++ b/doc/examples/basic_json__basic_json.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/basic_json__basic_json.link b/doc/examples/basic_json__basic_json.link
index 4853dde83..c3109d16e 100644
--- a/doc/examples/basic_json__basic_json.link
+++ b/doc/examples/basic_json__basic_json.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/wwzBU7cK8Xr2yiKJ"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/vPBv5smAPKUko4Qo"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/basic_json__boolean_t.cpp b/doc/examples/basic_json__boolean_t.cpp
index cd6117c84..38f014e01 100644
--- a/doc/examples/basic_json__boolean_t.cpp
+++ b/doc/examples/basic_json__boolean_t.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/basic_json__boolean_t.link b/doc/examples/basic_json__boolean_t.link
index 656069902..9fe211e42 100644
--- a/doc/examples/basic_json__boolean_t.link
+++ b/doc/examples/basic_json__boolean_t.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/RzWnqhbfuvbHXCBJ"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/saCwetmQZaB8tQ24"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/basic_json__const_int.cpp b/doc/examples/basic_json__const_int.cpp
index b0797f573..7e38544bf 100644
--- a/doc/examples/basic_json__const_int.cpp
+++ b/doc/examples/basic_json__const_int.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/basic_json__const_int.link b/doc/examples/basic_json__const_int.link
index 8df3800a7..73d286286 100644
--- a/doc/examples/basic_json__const_int.link
+++ b/doc/examples/basic_json__const_int.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/BPk4vUc4kJPWX0rz"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/BzGFT02b2KTR6z2B"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/basic_json__copyassignment.cpp b/doc/examples/basic_json__copyassignment.cpp
index 977bd79db..9e9c2eccf 100644
--- a/doc/examples/basic_json__copyassignment.cpp
+++ b/doc/examples/basic_json__copyassignment.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/basic_json__copyassignment.link b/doc/examples/basic_json__copyassignment.link
index 363e8ff6d..96679cf45 100644
--- a/doc/examples/basic_json__copyassignment.link
+++ b/doc/examples/basic_json__copyassignment.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/P8QWpucrWhov8JRR"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/Ib1A0jrFXwYhf0eA"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/basic_json__list_init_t.cpp b/doc/examples/basic_json__list_init_t.cpp
index 393c17ffd..8734dff15 100644
--- a/doc/examples/basic_json__list_init_t.cpp
+++ b/doc/examples/basic_json__list_init_t.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/basic_json__list_init_t.link b/doc/examples/basic_json__list_init_t.link
index 36a902280..5eca20502 100644
--- a/doc/examples/basic_json__list_init_t.link
+++ b/doc/examples/basic_json__list_init_t.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/IWIZSNthuHrT3AS6"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/r7SIosyJCePZZvqh"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/basic_json__moveconstructor.cpp b/doc/examples/basic_json__moveconstructor.cpp
index f73f8a5ae..e470c95b1 100644
--- a/doc/examples/basic_json__moveconstructor.cpp
+++ b/doc/examples/basic_json__moveconstructor.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/basic_json__moveconstructor.link b/doc/examples/basic_json__moveconstructor.link
index 8fe8910c9..88002bbd8 100644
--- a/doc/examples/basic_json__moveconstructor.link
+++ b/doc/examples/basic_json__moveconstructor.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/dvTtz7DIo8TDhYE6"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/y7ngrkT74SN0fFWG"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/basic_json__nullptr_t.cpp b/doc/examples/basic_json__nullptr_t.cpp
index f2f1a8c07..426afabc6 100644
--- a/doc/examples/basic_json__nullptr_t.cpp
+++ b/doc/examples/basic_json__nullptr_t.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/basic_json__nullptr_t.link b/doc/examples/basic_json__nullptr_t.link
index 3587d6020..bb26af46d 100644
--- a/doc/examples/basic_json__nullptr_t.link
+++ b/doc/examples/basic_json__nullptr_t.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/hcERmrPzjmXeSzB8"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/Y7B27Mtrcp64PI9l"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/basic_json__number_float_t.cpp b/doc/examples/basic_json__number_float_t.cpp
index 88403231a..92533b7d0 100644
--- a/doc/examples/basic_json__number_float_t.cpp
+++ b/doc/examples/basic_json__number_float_t.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/basic_json__number_float_t.link b/doc/examples/basic_json__number_float_t.link
index c5a320a74..a7c6b6074 100644
--- a/doc/examples/basic_json__number_float_t.link
+++ b/doc/examples/basic_json__number_float_t.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/47cqX7AduSWn24lA"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/rsIsQEvaeJEaJx9c"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/basic_json__number_integer_t.cpp b/doc/examples/basic_json__number_integer_t.cpp
index a40dd3e84..1078f360e 100644
--- a/doc/examples/basic_json__number_integer_t.cpp
+++ b/doc/examples/basic_json__number_integer_t.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/basic_json__number_integer_t.link b/doc/examples/basic_json__number_integer_t.link
index eb89983a3..764aa649d 100644
--- a/doc/examples/basic_json__number_integer_t.link
+++ b/doc/examples/basic_json__number_integer_t.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/RUSNdk5YEAr2vL4E"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/3aV9OONj8OfHPXBV"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/basic_json__object_t.cpp b/doc/examples/basic_json__object_t.cpp
index 0a296d1a7..39e2fcc0c 100644
--- a/doc/examples/basic_json__object_t.cpp
+++ b/doc/examples/basic_json__object_t.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/basic_json__object_t.link b/doc/examples/basic_json__object_t.link
index dbe9e78ec..f6bad665a 100644
--- a/doc/examples/basic_json__object_t.link
+++ b/doc/examples/basic_json__object_t.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/4IF0ofRq0nZcV8pI"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/YhDZ1WhldMdwBthI"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/basic_json__size_type_basic_json.cpp b/doc/examples/basic_json__size_type_basic_json.cpp
index 1774366d7..15f8c0d5c 100644
--- a/doc/examples/basic_json__size_type_basic_json.cpp
+++ b/doc/examples/basic_json__size_type_basic_json.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/basic_json__size_type_basic_json.link b/doc/examples/basic_json__size_type_basic_json.link
index 349d423d5..6ae76b6f2 100644
--- a/doc/examples/basic_json__size_type_basic_json.link
+++ b/doc/examples/basic_json__size_type_basic_json.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/dkznQmTMqulurCqD"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/OTJ7W8jL7z9qQlkL"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/basic_json__string_t.cpp b/doc/examples/basic_json__string_t.cpp
index 97d3c943d..3205f623d 100644
--- a/doc/examples/basic_json__string_t.cpp
+++ b/doc/examples/basic_json__string_t.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/basic_json__string_t.link b/doc/examples/basic_json__string_t.link
index e3f988fcb..a5051e582 100644
--- a/doc/examples/basic_json__string_t.link
+++ b/doc/examples/basic_json__string_t.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/S9jwK28ThNIGkdUI"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/ZRv2SsnLGdLzBhFO"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/basic_json__string_t_value_type.cpp b/doc/examples/basic_json__string_t_value_type.cpp
index 15bf39f18..5379ca064 100644
--- a/doc/examples/basic_json__string_t_value_type.cpp
+++ b/doc/examples/basic_json__string_t_value_type.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/basic_json__string_t_value_type.link b/doc/examples/basic_json__string_t_value_type.link
index f85b8236d..4646b5b2a 100644
--- a/doc/examples/basic_json__string_t_value_type.link
+++ b/doc/examples/basic_json__string_t_value_type.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/xNtouqvB2OJBOwkv"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/xttjHgaxVqpfriXz"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/basic_json__value.cpp b/doc/examples/basic_json__value.cpp
index 37081791e..dfb91d840 100644
--- a/doc/examples/basic_json__value.cpp
+++ b/doc/examples/basic_json__value.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/basic_json__value.link b/doc/examples/basic_json__value.link
index 6698c8917..452a1fe4f 100644
--- a/doc/examples/basic_json__value.link
+++ b/doc/examples/basic_json__value.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/pehnjdIduvv90qfX"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/ejZBeBBPEBmYsPFz"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/basic_json__value_t.cpp b/doc/examples/basic_json__value_t.cpp
index c36e0e518..faf5dfaec 100644
--- a/doc/examples/basic_json__value_t.cpp
+++ b/doc/examples/basic_json__value_t.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/basic_json__value_t.link b/doc/examples/basic_json__value_t.link
index 9d8b06335..774aaa255 100644
--- a/doc/examples/basic_json__value_t.link
+++ b/doc/examples/basic_json__value_t.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/ncOG8fdxNrISUNFj"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/fkrZveuulCw95PXF"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/begin.cpp b/doc/examples/begin.cpp
index f6b1b1e49..46c17218d 100644
--- a/doc/examples/begin.cpp
+++ b/doc/examples/begin.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/begin.link b/doc/examples/begin.link
index 5db4ca8d2..6a76a5887 100644
--- a/doc/examples/begin.link
+++ b/doc/examples/begin.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/Nwb94PEGlvnjrqj1"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/9HE53y23Ldu1xzQU"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/cbegin.cpp b/doc/examples/cbegin.cpp
index 43a11939d..fe45e49b0 100644
--- a/doc/examples/cbegin.cpp
+++ b/doc/examples/cbegin.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/cbegin.link b/doc/examples/cbegin.link
index fcbe5f2b6..83c75dd3c 100644
--- a/doc/examples/cbegin.link
+++ b/doc/examples/cbegin.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/mWrMi5IrJjRILgir"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/8rGgyscFrA1fCiIn"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/cend.cpp b/doc/examples/cend.cpp
index f796c9051..a140fb0b5 100644
--- a/doc/examples/cend.cpp
+++ b/doc/examples/cend.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/cend.link b/doc/examples/cend.link
index 60ba84418..acca215d2 100644
--- a/doc/examples/cend.link
+++ b/doc/examples/cend.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/0OHrFwFGvRuDKdfx"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/Zek4QM4kvKLUywGC"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/clear.cpp b/doc/examples/clear.cpp
index dcd3cc79b..60016753b 100644
--- a/doc/examples/clear.cpp
+++ b/doc/examples/clear.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/clear.link b/doc/examples/clear.link
index 5a34bf9f8..8defa668d 100644
--- a/doc/examples/clear.link
+++ b/doc/examples/clear.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/Ddggfbg18WXOIBkW"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/D6RJMyjkibQmKUC4"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/count.cpp b/doc/examples/count.cpp
index cf6796447..a805eeb6a 100644
--- a/doc/examples/count.cpp
+++ b/doc/examples/count.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/count.link b/doc/examples/count.link
index ef8835391..e13caf363 100644
--- a/doc/examples/count.link
+++ b/doc/examples/count.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/mPQHwiNeVa872Aky"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/GFOaqTzQCZeTQk3R"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/crbegin.cpp b/doc/examples/crbegin.cpp
index b36692fa7..4ea71d973 100644
--- a/doc/examples/crbegin.cpp
+++ b/doc/examples/crbegin.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/crbegin.link b/doc/examples/crbegin.link
index ad4fbeb9f..27de8eb89 100644
--- a/doc/examples/crbegin.link
+++ b/doc/examples/crbegin.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/XA8jRF4u0UBKMVKT"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/ZVFFzaSjRzx81O7o"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/crend.cpp b/doc/examples/crend.cpp
index d61804e87..079eeea6c 100644
--- a/doc/examples/crend.cpp
+++ b/doc/examples/crend.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/crend.link b/doc/examples/crend.link
index a691504ae..c678236d9 100644
--- a/doc/examples/crend.link
+++ b/doc/examples/crend.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/XHuFmdmwqZ7Tdw2U"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/EmWt4iCaVbSmTxUs"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/dump.cpp b/doc/examples/dump.cpp
index 962e40082..3145d4539 100644
--- a/doc/examples/dump.cpp
+++ b/doc/examples/dump.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/dump.link b/doc/examples/dump.link
index d6470d44a..35ef46533 100644
--- a/doc/examples/dump.link
+++ b/doc/examples/dump.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/tkZFGPekIFMEQYY0"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/PjtHNsrmmgEeCFVp"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/empty.cpp b/doc/examples/empty.cpp
index 0da27d27b..2edda6dc9 100644
--- a/doc/examples/empty.cpp
+++ b/doc/examples/empty.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/empty.link b/doc/examples/empty.link
index 8b885b037..fd22770cf 100644
--- a/doc/examples/empty.link
+++ b/doc/examples/empty.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/8vK2Qdo2tJk3loVq"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/daiGc21CilMsU7ln"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/end.cpp b/doc/examples/end.cpp
index 11a655753..848623a4d 100644
--- a/doc/examples/end.cpp
+++ b/doc/examples/end.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/end.link b/doc/examples/end.link
index 4f9ce01dc..260696d5a 100644
--- a/doc/examples/end.link
+++ b/doc/examples/end.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/PTRnmRsywWUoknqU"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/7QIAVTX9fvOkHUrH"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/erase__IteratorType.cpp b/doc/examples/erase__IteratorType.cpp
index 3c02bbffc..5743c3274 100644
--- a/doc/examples/erase__IteratorType.cpp
+++ b/doc/examples/erase__IteratorType.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/erase__IteratorType.link b/doc/examples/erase__IteratorType.link
index e1a133a0d..b523066ed 100644
--- a/doc/examples/erase__IteratorType.link
+++ b/doc/examples/erase__IteratorType.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/iqtEFeReXatgjqHy"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/DlwzEWGJkvmikaNi"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/erase__IteratorType_IteratorType.cpp b/doc/examples/erase__IteratorType_IteratorType.cpp
index a5bde58b4..9250c3ca0 100644
--- a/doc/examples/erase__IteratorType_IteratorType.cpp
+++ b/doc/examples/erase__IteratorType_IteratorType.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/erase__IteratorType_IteratorType.link b/doc/examples/erase__IteratorType_IteratorType.link
index c1479769c..b7f3da724 100644
--- a/doc/examples/erase__IteratorType_IteratorType.link
+++ b/doc/examples/erase__IteratorType_IteratorType.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/4ZSaQAFaqyN8Vhop"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/ds4TH3IAYVLCGyIz"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/erase__key_type.cpp b/doc/examples/erase__key_type.cpp
index a1d1e44df..ca0962aaa 100644
--- a/doc/examples/erase__key_type.cpp
+++ b/doc/examples/erase__key_type.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/erase__key_type.link b/doc/examples/erase__key_type.link
index 4ab5bb614..bef018cab 100644
--- a/doc/examples/erase__key_type.link
+++ b/doc/examples/erase__key_type.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/vQ4ipI1dlW8IZhNh"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/h6FfQqA0UIqdG6ca"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/erase__size_type.cpp b/doc/examples/erase__size_type.cpp
index 8578660eb..7df3d0625 100644
--- a/doc/examples/erase__size_type.cpp
+++ b/doc/examples/erase__size_type.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/erase__size_type.link b/doc/examples/erase__size_type.link
index 1a4bbfdde..fe2d560d5 100644
--- a/doc/examples/erase__size_type.link
+++ b/doc/examples/erase__size_type.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/foNekpKoDDTEfKuy"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/Fg7ut6CV4YBCsDbQ"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/find__key_type.cpp b/doc/examples/find__key_type.cpp
index 214fe53f5..79eed509a 100644
--- a/doc/examples/find__key_type.cpp
+++ b/doc/examples/find__key_type.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/find__key_type.link b/doc/examples/find__key_type.link
index 68beedbe3..2bc0512d1 100644
--- a/doc/examples/find__key_type.link
+++ b/doc/examples/find__key_type.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/q5oRles9a6IgEOkD"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/BfABW7AMVl4xqeoJ"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/front.cpp b/doc/examples/front.cpp
index 8ed35764e..a29d33eff 100644
--- a/doc/examples/front.cpp
+++ b/doc/examples/front.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/front.link b/doc/examples/front.link
index 2821f00d3..32d4a19ba 100644
--- a/doc/examples/front.link
+++ b/doc/examples/front.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/OvihNTNV4XPwoSw8"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/NH4F08xGiQfNT71r"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/get__PointerType.cpp b/doc/examples/get__PointerType.cpp
index ed77d7b0c..7c15c5aa3 100644
--- a/doc/examples/get__PointerType.cpp
+++ b/doc/examples/get__PointerType.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/get__PointerType.link b/doc/examples/get__PointerType.link
index 7dd011cb0..a811b26df 100644
--- a/doc/examples/get__PointerType.link
+++ b/doc/examples/get__PointerType.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/OQ6W9gVosCWDgJHS"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/iunIxpTIIy6vcWJZ"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/get__ValueType_const.cpp b/doc/examples/get__ValueType_const.cpp
index 3ccba5489..40a96184b 100644
--- a/doc/examples/get__ValueType_const.cpp
+++ b/doc/examples/get__ValueType_const.cpp
@@ -1,7 +1,7 @@
 #include <json.hpp>
 #include <unordered_map>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/get__ValueType_const.link b/doc/examples/get__ValueType_const.link
index 0969939c2..fce774b2b 100644
--- a/doc/examples/get__ValueType_const.link
+++ b/doc/examples/get__ValueType_const.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/4OkGAXhiCsa1E5Jx"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/7k9830oUxfGndWzT"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/get_ptr.cpp b/doc/examples/get_ptr.cpp
index 2a3d974a1..2c319dc40 100644
--- a/doc/examples/get_ptr.cpp
+++ b/doc/examples/get_ptr.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/get_ptr.link b/doc/examples/get_ptr.link
index 265ebb048..e318d7780 100644
--- a/doc/examples/get_ptr.link
+++ b/doc/examples/get_ptr.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/Onaz3FY3sow5TEwH"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/NDeUS78poIDrGhIP"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/get_ref.cpp b/doc/examples/get_ref.cpp
index c73cff3e4..d0ddb2d27 100644
--- a/doc/examples/get_ref.cpp
+++ b/doc/examples/get_ref.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/get_ref.link b/doc/examples/get_ref.link
index 4c8fd69af..c0d8275a3 100644
--- a/doc/examples/get_ref.link
+++ b/doc/examples/get_ref.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/nBNBANVonG9HCQqQ"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/5IINd4ZXCINhlk8u"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/insert.cpp b/doc/examples/insert.cpp
index c7adfc5ad..967f443ef 100644
--- a/doc/examples/insert.cpp
+++ b/doc/examples/insert.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/insert.link b/doc/examples/insert.link
index 80ec801ca..3886e04d5 100644
--- a/doc/examples/insert.link
+++ b/doc/examples/insert.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/s0562du3uk9eMpos"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/814P5z0lA90nVh8b"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/insert__count.cpp b/doc/examples/insert__count.cpp
index cfdb39b67..258515e68 100644
--- a/doc/examples/insert__count.cpp
+++ b/doc/examples/insert__count.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/insert__count.link b/doc/examples/insert__count.link
index 3c0e781cb..b97d0d69f 100644
--- a/doc/examples/insert__count.link
+++ b/doc/examples/insert__count.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/kZCcDOrWRsmOCjOn"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/OG3x3F7DFoqtHyqh"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/insert__ilist.cpp b/doc/examples/insert__ilist.cpp
index 02d83daee..c0138d2a0 100644
--- a/doc/examples/insert__ilist.cpp
+++ b/doc/examples/insert__ilist.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/insert__ilist.link b/doc/examples/insert__ilist.link
index b7bfd25af..4920588b5 100644
--- a/doc/examples/insert__ilist.link
+++ b/doc/examples/insert__ilist.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/ciOQKs1KoHMSAWN3"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/6gMuEfviD6ijflgd"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/insert__range.cpp b/doc/examples/insert__range.cpp
index 03ea0bc3b..b5d0001ba 100644
--- a/doc/examples/insert__range.cpp
+++ b/doc/examples/insert__range.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/insert__range.link b/doc/examples/insert__range.link
index 03c5d0124..ac773f8b2 100644
--- a/doc/examples/insert__range.link
+++ b/doc/examples/insert__range.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/lZeC91nMjP3Npmx7"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/pUKVc892loGnjxUL"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/is_array.cpp b/doc/examples/is_array.cpp
index c436f38f4..11a631150 100644
--- a/doc/examples/is_array.cpp
+++ b/doc/examples/is_array.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/is_array.link b/doc/examples/is_array.link
index 4d5fdb07f..8c8b9f825 100644
--- a/doc/examples/is_array.link
+++ b/doc/examples/is_array.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/NTSNuQecVsmv3guC"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/0jJBJgku6NLIxJfv"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/is_boolean.cpp b/doc/examples/is_boolean.cpp
index 24511a2fd..9efcf6943 100644
--- a/doc/examples/is_boolean.cpp
+++ b/doc/examples/is_boolean.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/is_boolean.link b/doc/examples/is_boolean.link
index 5fda3d0a8..62f5fed14 100644
--- a/doc/examples/is_boolean.link
+++ b/doc/examples/is_boolean.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/3ZOet3bImwKg2vMb"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/chWkSIROaePvwcDq"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/is_discarded.cpp b/doc/examples/is_discarded.cpp
index 7f6c8c07b..a1d42a7a8 100644
--- a/doc/examples/is_discarded.cpp
+++ b/doc/examples/is_discarded.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/is_discarded.link b/doc/examples/is_discarded.link
index 5f58643d7..7ce69a104 100644
--- a/doc/examples/is_discarded.link
+++ b/doc/examples/is_discarded.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/a0c6rKo8VbeOBAmD"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/j10gcmatdR8o625C"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/is_null.cpp b/doc/examples/is_null.cpp
index d6a6de4c7..0d69c05c2 100644
--- a/doc/examples/is_null.cpp
+++ b/doc/examples/is_null.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/is_null.link b/doc/examples/is_null.link
index 39c5d2611..6b22b9780 100644
--- a/doc/examples/is_null.link
+++ b/doc/examples/is_null.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/z9pBPy4eSYMCZgEr"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/rnEIZwD2AvtjaEzo"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/is_number.cpp b/doc/examples/is_number.cpp
index 29c21ffba..fd2a99b11 100644
--- a/doc/examples/is_number.cpp
+++ b/doc/examples/is_number.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/is_number.link b/doc/examples/is_number.link
index 090b5ca92..bf863a1cf 100644
--- a/doc/examples/is_number.link
+++ b/doc/examples/is_number.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/1rel3xdea4ADiKds"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/ZyMWRbD7gH5eC5Xy"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/is_number_float.cpp b/doc/examples/is_number_float.cpp
index 289428c3e..92bcfa108 100644
--- a/doc/examples/is_number_float.cpp
+++ b/doc/examples/is_number_float.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/is_number_float.link b/doc/examples/is_number_float.link
index 7ed767603..38abb5985 100644
--- a/doc/examples/is_number_float.link
+++ b/doc/examples/is_number_float.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/vEZZNyL8GPbAfAsJ"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/ouIIgi0X3Te9upBj"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/is_number_integer.cpp b/doc/examples/is_number_integer.cpp
index d7a38b6ad..ecac7cd64 100644
--- a/doc/examples/is_number_integer.cpp
+++ b/doc/examples/is_number_integer.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/is_number_integer.link b/doc/examples/is_number_integer.link
index fae1ef433..d6162ab0e 100644
--- a/doc/examples/is_number_integer.link
+++ b/doc/examples/is_number_integer.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/bulo75cZB0cPINgL"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/jZwJVIXretvfg4kS"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/is_number_unsigned.cpp b/doc/examples/is_number_unsigned.cpp
index 185d93de7..ad457591c 100644
--- a/doc/examples/is_number_unsigned.cpp
+++ b/doc/examples/is_number_unsigned.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/is_number_unsigned.link b/doc/examples/is_number_unsigned.link
index 1877ced96..41986cefa 100644
--- a/doc/examples/is_number_unsigned.link
+++ b/doc/examples/is_number_unsigned.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/h4s4VitQ3VmCOEXr"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/Vd3c1gtskokcJHp7"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/is_object.cpp b/doc/examples/is_object.cpp
index b85253a3b..56db66e56 100644
--- a/doc/examples/is_object.cpp
+++ b/doc/examples/is_object.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/is_object.link b/doc/examples/is_object.link
index 549bc0c0f..1a304d09a 100644
--- a/doc/examples/is_object.link
+++ b/doc/examples/is_object.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/40lrBaplftujclBr"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/ivLUeazmkk6aCUkE"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/is_primitive.cpp b/doc/examples/is_primitive.cpp
index 3f45b95a5..48872ab5a 100644
--- a/doc/examples/is_primitive.cpp
+++ b/doc/examples/is_primitive.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/is_primitive.link b/doc/examples/is_primitive.link
index 27167a3a4..eb73ffb1b 100644
--- a/doc/examples/is_primitive.link
+++ b/doc/examples/is_primitive.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/zZYJHMvzYyYkNoAU"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/9qjfclmdmZrCnVR3"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/is_string.cpp b/doc/examples/is_string.cpp
index 6020fb668..2d6ed0698 100644
--- a/doc/examples/is_string.cpp
+++ b/doc/examples/is_string.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/is_string.link b/doc/examples/is_string.link
index 1e8d54fa3..6af78b0ba 100644
--- a/doc/examples/is_string.link
+++ b/doc/examples/is_string.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/1x7B5XrHtV8RTROC"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/Uh60XVyyG1N5pL2n"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/is_structured.cpp b/doc/examples/is_structured.cpp
index 40a7cb332..ed573e3cc 100644
--- a/doc/examples/is_structured.cpp
+++ b/doc/examples/is_structured.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/is_structured.link b/doc/examples/is_structured.link
index 6cc3c9bba..8ae6fd044 100644
--- a/doc/examples/is_structured.link
+++ b/doc/examples/is_structured.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/kXpxIk6MP6OxEvwu"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/QH2PmyggbFbaA8Dg"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/max_size.cpp b/doc/examples/max_size.cpp
index b5537c671..d2f1b727d 100644
--- a/doc/examples/max_size.cpp
+++ b/doc/examples/max_size.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/max_size.link b/doc/examples/max_size.link
index 88752ae72..d91bc8cda 100644
--- a/doc/examples/max_size.link
+++ b/doc/examples/max_size.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/RLNomTjexFIzyUx4"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/pHK8lxPJaR0LZwRM"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/object.cpp b/doc/examples/object.cpp
index a4f9b4a26..54f3ca3b8 100644
--- a/doc/examples/object.cpp
+++ b/doc/examples/object.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/object.link b/doc/examples/object.link
index b41ff5a33..575473b35 100644
--- a/doc/examples/object.link
+++ b/doc/examples/object.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/wArBhgANa8p39v92"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/g46YJ0TCAELXYvZb"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/operator__ValueType.cpp b/doc/examples/operator__ValueType.cpp
index 962b4bf64..9307e69bb 100644
--- a/doc/examples/operator__ValueType.cpp
+++ b/doc/examples/operator__ValueType.cpp
@@ -1,7 +1,7 @@
 #include <json.hpp>
 #include <unordered_map>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/operator__ValueType.link b/doc/examples/operator__ValueType.link
index cc28e01f1..204d8f5e3 100644
--- a/doc/examples/operator__ValueType.link
+++ b/doc/examples/operator__ValueType.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/PK8Jc2HcZ1MdHOFH"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/laFGVm1oHwhEIiJl"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/operator__equal.cpp b/doc/examples/operator__equal.cpp
index e40dc9649..12bf92ed5 100644
--- a/doc/examples/operator__equal.cpp
+++ b/doc/examples/operator__equal.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/operator__equal.link b/doc/examples/operator__equal.link
index 28e820443..41ae20ce3 100644
--- a/doc/examples/operator__equal.link
+++ b/doc/examples/operator__equal.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/a74tSggkWP5Zo0Ee"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/Zpc5xccVHh210pJ4"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/operator__equal__nullptr_t.cpp b/doc/examples/operator__equal__nullptr_t.cpp
index f3ce2fe21..49c632cfd 100644
--- a/doc/examples/operator__equal__nullptr_t.cpp
+++ b/doc/examples/operator__equal__nullptr_t.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/operator__equal__nullptr_t.link b/doc/examples/operator__equal__nullptr_t.link
index 0ddbd47ef..49e46fd65 100644
--- a/doc/examples/operator__equal__nullptr_t.link
+++ b/doc/examples/operator__equal__nullptr_t.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/gXAi4IhfawcmtX6v"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/Y7k4oKr0qq2C1m6Q"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/operator__greater.cpp b/doc/examples/operator__greater.cpp
index bd78b0ce1..bee3b2b5a 100644
--- a/doc/examples/operator__greater.cpp
+++ b/doc/examples/operator__greater.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/operator__greater.link b/doc/examples/operator__greater.link
index 5b13ba112..2299d6102 100644
--- a/doc/examples/operator__greater.link
+++ b/doc/examples/operator__greater.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/TZmhplJw3tl08RFN"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/FsDUutWOyZiFDADV"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/operator__greaterequal.cpp b/doc/examples/operator__greaterequal.cpp
index df73b5151..cd3989669 100644
--- a/doc/examples/operator__greaterequal.cpp
+++ b/doc/examples/operator__greaterequal.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/operator__greaterequal.link b/doc/examples/operator__greaterequal.link
index 76203276d..fdd676e6e 100644
--- a/doc/examples/operator__greaterequal.link
+++ b/doc/examples/operator__greaterequal.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/clvCFZxlFEerhtk8"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/EGB8bgj4XZ1QDdoG"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/operator__less.cpp b/doc/examples/operator__less.cpp
index 68afac04e..d4a7b7941 100644
--- a/doc/examples/operator__less.cpp
+++ b/doc/examples/operator__less.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/operator__less.link b/doc/examples/operator__less.link
index 949c3f83f..5d7f6f566 100644
--- a/doc/examples/operator__less.link
+++ b/doc/examples/operator__less.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/85XpxnwbJZR1PVtz"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/4UPUe8lpV9e48paC"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/operator__lessequal.cpp b/doc/examples/operator__lessequal.cpp
index 98f99b4d5..20654d9e8 100644
--- a/doc/examples/operator__lessequal.cpp
+++ b/doc/examples/operator__lessequal.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/operator__lessequal.link b/doc/examples/operator__lessequal.link
index 8e2c58aab..620b6aa8a 100644
--- a/doc/examples/operator__lessequal.link
+++ b/doc/examples/operator__lessequal.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/JYP6JpBzl8Q9xQDZ"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/D1CUYI3AqEozXpjh"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/operator__notequal.cpp b/doc/examples/operator__notequal.cpp
index 27182b258..499a00d17 100644
--- a/doc/examples/operator__notequal.cpp
+++ b/doc/examples/operator__notequal.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/operator__notequal.link b/doc/examples/operator__notequal.link
index 6a9d08f55..482b97212 100644
--- a/doc/examples/operator__notequal.link
+++ b/doc/examples/operator__notequal.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/csiUCov9Mquff3ZZ"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/AVJ7PQO6te3sC6kp"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/operator__notequal__nullptr_t.cpp b/doc/examples/operator__notequal__nullptr_t.cpp
index 9a740d5d5..014e6343a 100644
--- a/doc/examples/operator__notequal__nullptr_t.cpp
+++ b/doc/examples/operator__notequal__nullptr_t.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/operator__notequal__nullptr_t.link b/doc/examples/operator__notequal__nullptr_t.link
index 4d6ad55f6..40f6bb4fe 100644
--- a/doc/examples/operator__notequal__nullptr_t.link
+++ b/doc/examples/operator__notequal__nullptr_t.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/yfp2fEHkXCZSenTX"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/E0Hu2nk9YvMUW1ck"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/operator__value_t.cpp b/doc/examples/operator__value_t.cpp
index 39d85a690..d281df0d8 100644
--- a/doc/examples/operator__value_t.cpp
+++ b/doc/examples/operator__value_t.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/operator__value_t.link b/doc/examples/operator__value_t.link
index 36b32318a..a97072328 100644
--- a/doc/examples/operator__value_t.link
+++ b/doc/examples/operator__value_t.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/OTJgTuHDjzQlrONB"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/qt8t1mE1LjXjtBtO"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/operator_deserialize.cpp b/doc/examples/operator_deserialize.cpp
index af82c74ea..a43cdf0fb 100644
--- a/doc/examples/operator_deserialize.cpp
+++ b/doc/examples/operator_deserialize.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/operator_deserialize.link b/doc/examples/operator_deserialize.link
index 3b6051510..27e998d9a 100644
--- a/doc/examples/operator_deserialize.link
+++ b/doc/examples/operator_deserialize.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/q0DrCAa87X0xR7vu"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/Q4f0uwIQWvnheKCb"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/operator_serialize.cpp b/doc/examples/operator_serialize.cpp
index 2531064e8..c1568d99d 100644
--- a/doc/examples/operator_serialize.cpp
+++ b/doc/examples/operator_serialize.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/operator_serialize.link b/doc/examples/operator_serialize.link
index 558c0738f..231306ac2 100644
--- a/doc/examples/operator_serialize.link
+++ b/doc/examples/operator_serialize.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/t8kFPBs2j2mN6VBc"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/c5XBX38eOBEz5Xkw"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/operatorarray__key_type.cpp b/doc/examples/operatorarray__key_type.cpp
index 6050dc128..e83a2ac00 100644
--- a/doc/examples/operatorarray__key_type.cpp
+++ b/doc/examples/operatorarray__key_type.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/operatorarray__key_type.link b/doc/examples/operatorarray__key_type.link
index 1dfa0cc08..40df071bf 100644
--- a/doc/examples/operatorarray__key_type.link
+++ b/doc/examples/operatorarray__key_type.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/NjX5TeaQdGHer7Xu"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/ibp0eDm8dPhHEsSB"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/operatorarray__key_type_const.cpp b/doc/examples/operatorarray__key_type_const.cpp
index a59cca58b..5ad97355e 100644
--- a/doc/examples/operatorarray__key_type_const.cpp
+++ b/doc/examples/operatorarray__key_type_const.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/operatorarray__key_type_const.link b/doc/examples/operatorarray__key_type_const.link
index 7e740a1b8..bba664a5c 100644
--- a/doc/examples/operatorarray__key_type_const.link
+++ b/doc/examples/operatorarray__key_type_const.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/4WLxv7id8P64Q1KI"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/pHB8PKHjuFOesfMM"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/operatorarray__size_type.cpp b/doc/examples/operatorarray__size_type.cpp
index 70a7d5626..4ccbf2704 100644
--- a/doc/examples/operatorarray__size_type.cpp
+++ b/doc/examples/operatorarray__size_type.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/operatorarray__size_type.link b/doc/examples/operatorarray__size_type.link
index 050f86f60..b9d578810 100644
--- a/doc/examples/operatorarray__size_type.link
+++ b/doc/examples/operatorarray__size_type.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/x5eACUyqALnEmtJa"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/KUCir2gm6mh39HNy"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/operatorarray__size_type_const.cpp b/doc/examples/operatorarray__size_type_const.cpp
index d99d8c5dd..2ef794781 100644
--- a/doc/examples/operatorarray__size_type_const.cpp
+++ b/doc/examples/operatorarray__size_type_const.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/operatorarray__size_type_const.link b/doc/examples/operatorarray__size_type_const.link
index ef0eec4f7..a1f8c98b7 100644
--- a/doc/examples/operatorarray__size_type_const.link
+++ b/doc/examples/operatorarray__size_type_const.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/eyDuHRe4RnWdGv2o"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/KGERZ2Wgb9dpt4V0"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/parse__istream__parser_callback_t.cpp b/doc/examples/parse__istream__parser_callback_t.cpp
index 858053100..6812a5e2e 100644
--- a/doc/examples/parse__istream__parser_callback_t.cpp
+++ b/doc/examples/parse__istream__parser_callback_t.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/parse__istream__parser_callback_t.link b/doc/examples/parse__istream__parser_callback_t.link
index 36aee856f..85960e159 100644
--- a/doc/examples/parse__istream__parser_callback_t.link
+++ b/doc/examples/parse__istream__parser_callback_t.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/2ZxOGwFs5YLdSOlG"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/9Maolv5LJQM9pbqb"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/parse__string__parser_callback_t.cpp b/doc/examples/parse__string__parser_callback_t.cpp
index 52fecbffd..62982ca6f 100644
--- a/doc/examples/parse__string__parser_callback_t.cpp
+++ b/doc/examples/parse__string__parser_callback_t.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/parse__string__parser_callback_t.link b/doc/examples/parse__string__parser_callback_t.link
index f92ef4b67..9db1c3b83 100644
--- a/doc/examples/parse__string__parser_callback_t.link
+++ b/doc/examples/parse__string__parser_callback_t.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/XD9GkEmVZI9ecPEL"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/rleJPtEaWVJ9oBAn"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/push_back.cpp b/doc/examples/push_back.cpp
index 8599999c2..5d0877f0a 100644
--- a/doc/examples/push_back.cpp
+++ b/doc/examples/push_back.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/push_back.link b/doc/examples/push_back.link
index a1781b84f..8ec17dbac 100644
--- a/doc/examples/push_back.link
+++ b/doc/examples/push_back.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/5ZglUDvkQ0VxYxQ4"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/NDbzJ3aIWcJCtyQj"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/push_back__object_t__value.cpp b/doc/examples/push_back__object_t__value.cpp
index 92f1c210e..b55ee6402 100644
--- a/doc/examples/push_back__object_t__value.cpp
+++ b/doc/examples/push_back__object_t__value.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/push_back__object_t__value.link b/doc/examples/push_back__object_t__value.link
index 4744be03e..24882e38c 100644
--- a/doc/examples/push_back__object_t__value.link
+++ b/doc/examples/push_back__object_t__value.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/xtErbxTG2iIC5wHh"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/PbG1Ox3wbWO5M2n0"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/rbegin.cpp b/doc/examples/rbegin.cpp
index 58514b734..2ced56d3c 100644
--- a/doc/examples/rbegin.cpp
+++ b/doc/examples/rbegin.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/rbegin.link b/doc/examples/rbegin.link
index 69e5aaa20..de269d74b 100644
--- a/doc/examples/rbegin.link
+++ b/doc/examples/rbegin.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/qVpSdd1SQJeMkVQQ"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/61XbPi0WzoFMwGOC"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/rend.cpp b/doc/examples/rend.cpp
index 319a75c11..ece1c5517 100644
--- a/doc/examples/rend.cpp
+++ b/doc/examples/rend.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/rend.link b/doc/examples/rend.link
index e8c43daf3..17faa9117 100644
--- a/doc/examples/rend.link
+++ b/doc/examples/rend.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/7oaTSGkGGPAiGxSU"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/1jdSpDY9sGkVXNXf"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/size.cpp b/doc/examples/size.cpp
index db0128619..5949ed63f 100644
--- a/doc/examples/size.cpp
+++ b/doc/examples/size.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/size.link b/doc/examples/size.link
index e82246040..4cc0afa10 100644
--- a/doc/examples/size.link
+++ b/doc/examples/size.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/GozebkNWdjby4a8N"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/EbP2syhcIlnzaVgg"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/swap__array_t.cpp b/doc/examples/swap__array_t.cpp
index e97161830..3c2cc6b76 100644
--- a/doc/examples/swap__array_t.cpp
+++ b/doc/examples/swap__array_t.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/swap__array_t.link b/doc/examples/swap__array_t.link
index 5afa09c95..8851fdb98 100644
--- a/doc/examples/swap__array_t.link
+++ b/doc/examples/swap__array_t.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/qHbCdOUwZK6INFH8"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/Dm8mklPRNsWM9jDG"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/swap__object_t.cpp b/doc/examples/swap__object_t.cpp
index aaed2fc4c..d3a0bae25 100644
--- a/doc/examples/swap__object_t.cpp
+++ b/doc/examples/swap__object_t.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/swap__object_t.link b/doc/examples/swap__object_t.link
index 6063f8159..8bd7495ef 100644
--- a/doc/examples/swap__object_t.link
+++ b/doc/examples/swap__object_t.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/g5pkLUCrBVoNPRyE"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/oTEHCv1zOE5n03v8"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/swap__reference.cpp b/doc/examples/swap__reference.cpp
index 4c03cc01b..178a60bec 100644
--- a/doc/examples/swap__reference.cpp
+++ b/doc/examples/swap__reference.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/swap__reference.link b/doc/examples/swap__reference.link
index 7f834590f..3ee4c0df8 100644
--- a/doc/examples/swap__reference.link
+++ b/doc/examples/swap__reference.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/TKgXGJF9Cr5TXabd"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/HUBPhdgANUGiBEWp"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/swap__string_t.cpp b/doc/examples/swap__string_t.cpp
index 4922f7c9c..af166849f 100644
--- a/doc/examples/swap__string_t.cpp
+++ b/doc/examples/swap__string_t.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/swap__string_t.link b/doc/examples/swap__string_t.link
index 15d703e2d..719313695 100644
--- a/doc/examples/swap__string_t.link
+++ b/doc/examples/swap__string_t.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/UsEo3yK2GsjH8CyA"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/BBJAr8uCd2ru1ODN"><b>online</b></a>
\ No newline at end of file
diff --git a/doc/examples/type.cpp b/doc/examples/type.cpp
index e5a38ea83..07ec78856 100644
--- a/doc/examples/type.cpp
+++ b/doc/examples/type.cpp
@@ -1,6 +1,6 @@
 #include <json.hpp>
 
-using namespace nlohmann;
+using json = nlohmann::json;
 
 int main()
 {
diff --git a/doc/examples/type.link b/doc/examples/type.link
index acd8cbfb1..f197d847a 100644
--- a/doc/examples/type.link
+++ b/doc/examples/type.link
@@ -1 +1 @@
-<a target="_blank" href="http://melpon.org/wandbox/permlink/bYygSYwOFyTzN2Py"><b>online</b></a>
\ No newline at end of file
+<a target="_blank" href="http://melpon.org/wandbox/permlink/ZfaJtrNZiwyke1M8"><b>online</b></a>
\ No newline at end of file