diff --git a/doc/src_code/dictionary.cpp b/doc/src_code/dictionary.cpp
index 1f8ead92..dece3089 100644
--- a/doc/src_code/dictionary.cpp
+++ b/doc/src_code/dictionary.cpp
@@ -10,7 +10,6 @@
 
 //[case_insensitive_functions
     struct iequal_to
-        : std::binary_function<std::string, std::string, bool>
     {
         bool operator()(std::string const& x,
             std::string const& y) const
@@ -20,7 +19,6 @@
     };
 
     struct ihash
-        : std::unary_function<std::string, std::size_t>
     {
         std::size_t operator()(std::string const& x) const
         {
diff --git a/doc/src_code/point1.cpp b/doc/src_code/point1.cpp
index 0d17c1f5..dd562264 100644
--- a/doc/src_code/point1.cpp
+++ b/doc/src_code/point1.cpp
@@ -18,7 +18,6 @@
     }
 
     struct point_hash
-        : std::unary_function<point, std::size_t>
     {
         std::size_t operator()(point const& p) const
         {
diff --git a/examples/case_insensitive.hpp b/examples/case_insensitive.hpp
index 0204a221..83a388d8 100644
--- a/examples/case_insensitive.hpp
+++ b/examples/case_insensitive.hpp
@@ -19,7 +19,6 @@
 namespace hash_examples
 {
     struct iequal_to
-        : std::binary_function<std::string, std::string, bool>
     {
         iequal_to() {}
         explicit iequal_to(std::locale const& l) : locale_(l) {}
@@ -34,7 +33,6 @@ namespace hash_examples
     };
 
     struct ihash
-        : std::unary_function<std::string, std::size_t>
     {
         ihash() {}
         explicit ihash(std::locale const& l) : locale_(l) {}