Remove std::unary/binary_function use, they have been removed in C++17

include/boost/function/function_template.hpp

@@ -656,17 +656,6 @@ namespace boost {
     BOOST_FUNCTION_TEMPLATE_PARMS
   >
   class BOOST_FUNCTION_FUNCTION : public function_base
-
-#if BOOST_FUNCTION_NUM_ARGS == 1
-
-    , public std::unary_function<T0,R>
-
-#elif BOOST_FUNCTION_NUM_ARGS == 2
-
-    , public std::binary_function<T0,T1,R>
-
-#endif
-
   {
   public:
 #ifndef BOOST_NO_VOID_RETURNS

test/Jamfile.v2

@@ -66,6 +66,8 @@ import testing ;
   [ run libs/function/test/rvalues_test.cpp :  :  :  :  ]
 
   [ compile libs/function/test/function_typeof_test.cpp ]
+
+  [ run libs/function/test/result_arg_types_test.cpp ]
  ;
 }
       

test/result_arg_types_test.cpp

@@ -0,0 +1,40 @@
+// Boost.Function library
+
+//  Copyright 2016 Peter Dimov
+
+//  Use, modification and distribution is subject to
+//  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)
+
+#include <boost/function.hpp>
+#include <boost/core/is_same.hpp>
+#include <boost/core/lightweight_test_trait.hpp>
+
+struct X
+{
+};
+
+struct Y
+{
+};
+
+struct Z
+{
+};
+
+int main()
+{
+    typedef boost::function<X(Y)> F1;
+
+    BOOST_TEST_TRAIT_TRUE(( boost::core::is_same<F1::result_type, X> ));
+    BOOST_TEST_TRAIT_TRUE(( boost::core::is_same<F1::argument_type, Y> ));
+
+    typedef boost::function<X(Y, Z)> F2;
+
+    BOOST_TEST_TRAIT_TRUE(( boost::core::is_same<F2::result_type, X> ));
+    BOOST_TEST_TRAIT_TRUE(( boost::core::is_same<F2::first_argument_type, Y> ));
+    BOOST_TEST_TRAIT_TRUE(( boost::core::is_same<F2::second_argument_type, Z> ));
+
+    return boost::report_errors();
+}