2011-07-09 Jonathan Wakely <jwakely.gcc@gmail.com>

2011-07-09  Jonathan Wakely  <jwakely.gcc@gmail.com>

	* include/ext/alloc_traits.h (__allocator_always_compares_equal): New
	trait, provide partial specializations for known allocators.
	(__alloc_traits::construct, __alloc_traits::destroy): Overload for
	non-standard pointer types.
	(__alloc_traits::_S_always_equal): New trait for use with noexcept.
	(__alloc_traits::_S_nothrow_move): Likewise.
	(__alloc_traits::_S_nothrow_swap): Likewise.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@176077 138bc75d-0d04-0410-961f-82ee72b054a4