functional (function): Use explicit operator bool.

functional (function): Use explicit operator bool.

2009-05-20  Benjamin Kosnik  <bkoz@redhat.com>

	* include/tr1_impl/functional (function): Use explicit operator bool.
	* include/bits/shared_ptr.h (__shared_ptr): Same.
	* include/bits/unique_ptr.h (unique_ptr): Same.
	* include/std/mutex (unique_lock): Same.
	* include/std/system_error (error_code): Same.
	(error_condition): Same.
	* include/std/ostream (sentry): Same.
	* include/std/istream (sentry): Same.
	* testsuite/19_diagnostics/error_condition/operators/bool.cc: Adjust.
	* testsuite/19_diagnostics/error_condition/operators/bool_neg.cc: Same.
	* testsuite/19_diagnostics/error_code/operators/bool.cc: Same.
	* testsuite/19_diagnostics/error_code/operators/bool_neg.cc: Same.
	* testsuite/20_util/unique_ptr/modifiers/reset_neg.cc: Same.
	* testsuite/20_util/unique_ptr/assign/assign_neg.cc: Same.
	* testsuite/20_util/shared_ptr/observers/bool_conv.cc: Same.

From-SVN: r147756