2012-04-12  Paolo Carlini  <paolo.carlini@oracle.com>

	PR libstdc++/52942
	* include/bits/stl_function.h (_Identity, _Select1st, _Select2nd):
	In C++11 mode do not derive from std::unary_function.
	* include/ext/functional (identity, select1st, select2nd): Adjust.
	* testsuite/23_containers/unordered_map/requirements/52942.cc: New.
	* testsuite/23_containers/unordered_set/requirements/52942.cc: Likewise.

From-SVN: r186375