re PR libstdc++/48521 ([C++0x] std::result_of doesn't work with pointer to member)

re PR libstdc++/48521 ([C++0x] std::result_of doesn't work with pointer to member)

2011-04-19  Jonathan Wakely  <jwakely.gcc@gmail.com>

	PR libstdc++/48521
	* include/std/type_traits (result_of): Handle pointer to member.
	* include/std/functional (__invoke): Likewise.
	(_Function_to_function_pointer): Remove.
	(_Reference_wrapper_base): Provide nested types independent of
	unary_function and binary_function.
	(reference_wrapper::operator()): DR 2017.
	(ref(const A&&), cref(const A&&): Define as deleted.
	* include/std/future (async): Simplify SFINAE and use result_of to
	support pointer to member.
	* testsuite/20_util/reference_wrapper/invoke.cc: Test pointer to
	member.
	* testsuite/20_util/reference_wrapper/24803.cc: Likewise.
	* testsuite/20_util/reference_wrapper/typedefs.cc: Test for types
	instead of derivation from unary_function and binary_function.
	* testsuite/20_util/declval/requirements/1_neg.cc: Adjust.
	* testsuite/20_util/reference_wrapper/invoke-2.cc: New.
	* testsuite/20_util/reference_wrapper/ref_neg.c: New.
	* testsuite/20_util/reference_wrapper/typedefs-3.c: New.

From-SVN: r172709