2010-01-10  Paolo Carlini  <paolo.carlini@oracle.com>

	* include/bits/basic_string.h (basic_string<>::
	basic_string(basic_string&&), operator=(basic_string&&),
	assign(basic_string&&)): Add.
	* config/abi/pre/gnu.ver: Export new symbols.
	* include/ext/vstring.h (__versa_string<>::assign(__versa_string&&)):
	Add.
	(operator=(__versa_string&&)): Don't call clear unnecessarily.
	* include/ext/rc_string_base.h (__rc_string_base<>::
	__rc_string_base(__rc_string_base&&)): Simplify a tad.
	* testsuite/21_strings/basic_string/cons/char/moveable.cc: New.
	* testsuite/21_strings/basic_string/cons/wchar_t/moveable.cc: Likewise.
	* testsuite/ext/vstring/assign/move_assign.cc: Likewise.
	* testsuite/21_strings/basic_string/assign/char/move_assign.cc:
	Likewise.
	* testsuite/21_strings/basic_string/assign/wchar_t/move_assign.cc:
	Likewise.

From-SVN: r155788