Big update for is_function and is_member_function_pointer for modern compilers with modern features.

See https://github.com/boostorg/type_traits/issues/81.

test/is_function_test.cpp

@@ -12,6 +12,19 @@
 #include "test.hpp"
 #include "check_integral_constant.hpp"
 
+struct X
+{
+   void f() {}
+   void fc() const {}
+   void fv() volatile {}
+   void fcv() const volatile {}
+};
+
+template< class C, class F > void test_cv_qual(F C::*)
+{
+   BOOST_CHECK_INTEGRAL_CONSTANT(boost::is_function< F >::value, true);
+}
+
 TT_TEST_BEGIN(is_function)
 
 typedef void foo0_t();
@@ -72,6 +85,15 @@ BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_function<sfoo4_t>::value, true);
 
 #endif
 
+#ifndef BOOST_NO_CXX11_VARIADIC_TEMPLATES
+
+test_cv_qual(&X::f);
+test_cv_qual(&X::fc);
+test_cv_qual(&X::fv);
+test_cv_qual(&X::fcv);
+
+#endif
+
 TT_TEST_END