Add proxy example

example/CMakeLists.txt

@@ -11,11 +11,20 @@ source_group("" FILES
     file.hpp
     path.cpp
     pretty.cpp
+    proxy.cpp
     validate.cpp
 )
 
 #
 
+add_executable(path
+    path.cpp
+)
+set_property(TARGET path PROPERTY FOLDER "example")
+target_link_libraries(path PRIVATE Boost::json)
+
+#
+
 add_executable(pretty
     file.hpp
     pretty.cpp
@@ -25,11 +34,12 @@ target_link_libraries(pretty PRIVATE Boost::json)
 
 #
 
-add_executable(path
-    path.cpp
+add_executable(proxy
+    file.hpp
+    proxy.cpp
 )
-set_property(TARGET path PROPERTY FOLDER "example")
-target_link_libraries(path PRIVATE Boost::json)
+set_property(TARGET proxy PROPERTY FOLDER "example")
+target_link_libraries(proxy PRIVATE Boost::json)
 
 #
 

example/Jamfile

@@ -34,6 +34,12 @@ exe pretty :
     $(LIB)
     ;
 
+exe proxy :
+    proxy.cpp
+    : :
+    $(LIB)
+    ;
+
 exe validate :
     validate.cpp
     : :

example/proxy.cpp

@@ -0,0 +1,63 @@
+//
+// Copyright (c) 2019 Vinnie Falco (vinnie.falco@gmail.com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+// Official repository: https://github.com/cppalliance/json
+//
+
+#include <boost/json.hpp>
+
+using namespace boost::json;
+
+class proxy
+{
+    value& jv_;
+
+public:
+    explicit
+    proxy(value& jv) noexcept
+        : jv_(jv)
+    {
+    }
+
+    proxy
+    operator[](string_view key)
+    {
+        object* obj;
+        if(jv_.is_null())
+            obj = &jv_.emplace_object();
+        else
+            obj = &jv_.as_object();
+        return proxy((*obj)[key]);
+    }
+
+    proxy
+    operator[](std::size_t index)
+    {
+        array *arr;
+        if(jv_.is_null())
+            arr = &jv_.emplace_array();
+        else
+            arr = &jv_.as_array();
+        if(arr->size() <= index)
+            arr->resize(index + 1);
+        return proxy((*arr)[index]);
+    }
+
+    value&
+    operator*() noexcept
+    {
+        return jv_;
+    }
+};
+
+
+int
+main(int, char**)
+{
+    value jv;
+    *proxy(jv)["user:config"]["authority"]["router"][0]["users"] = 42;
+    return EXIT_SUCCESS;
+}