re PR libstdc++/41622 ([DR 1245] [c++0x] std::hash<std::string>::operator() copies its argument)

2009-11-19  Paolo Carlini  <paolo.carlini@oracle.com>

	PR libstdc++/41622
	* include/bits/functional_hash.h: Implement inline the various
	std::hash specializations, using, when appropriate, pass by
	const ref too, per DR 1245.
	* include/tr1_impl/functional_hash.h: Remove, move its contents...
	* include/tr1/functional_hash.h: ... here.
	* include/std/functional: Tweak includes.
	* src/hash_c++0x: Rename to...
	* src/compatibility-c++0x.cc: ... this, implementing compatibility
	std::hash<>::operator() specializations.
	* src/hash.cc: Do not mark specializations as throw().
	* src/Makefile.am: Adjust.
	* include/Makefile.am: Likewise.
	* src/Makefile.in: Regenerate.
	* include/Makefile.in: Likewise.
	* testsuite/util/testsuite_api.h: Define a dummy hash for
	NonDefaultConstructible.
	* testsuite/23_containers/unordered_map/requirements/
	explicit_instantiation/2.cc: Use it.
	* testsuite/23_containers/unordered_multimap/requirements/
	explicit_instantiation/2.cc: Likewise.
	* testsuite/23_containers/unordered_set/requirements/
	explicit_instantiation/2.cc: Likewise.
	* testsuite/23_containers/unordered_multiset/requirements/
	explicit_instantiation/2.cc: Likewise.

From-SVN: r154335