functional (function::function): Move construct target.

functional (function::function): Move construct target.

2009-12-15  Jonathan Wakely  <jwakely.gcc@gmail.com>

	* include/std/functional (function::function): Move construct target.
	(function::operator=): Use perfect forwarding for argument.
	(function::operator()): Use new __throw_bad_function_call.
	* include/bits/functexcept.h (__throw_bad_function_call): Declare.
	* src/functexcept.cc (__throw_bad_function_call): Define.
	* config/abi/pre/gnu.ver: Add new symbol.
	* testsuite/20_util/function/cons/move_target.cc: New.
	* testsuite/20_util/function/assign/move_target.cc: New.

From-SVN: r155261