type_traits: Implement is_pointer, remove_pointer, and add_pointer; reformat.

2004-12-12  Paolo Carlini  <pcarlini@suse.de>

	* include/tr1/type_traits: Implement is_pointer, remove_pointer,
	and add_pointer; reformat.
	(_DEFINE_PRIMARY_SPEC_HELPER, _DEFINE_PRIMARY_SPEC): Generalize
	and rename to _DEFINE_SPEC_HELPER and _DEFINE_SPEC; update uses.
	* testsuite/tr1/4_metaprogramming/pointer_modifications/
	add_pointer.cc: New.
	* testsuite/tr1/4_metaprogramming/pointer_modifications/
	remove_pointer.cc: Likewise.
	* testsuite/tr1/4_metaprogramming/primary_type_categories/
	is_pointer/is_pointer.cc: Likewise.
	* testsuite/tr1/4_metaprogramming/primary_type_categories/
	is_pointer/typedefs.cc: Likewise.

	* testsuite/tr1/4_metaprogramming/primary_type_categories/
	is_reference/is_reference.cc: Slightly tweak consistently.

From-SVN: r92047