type_traits: Implement is_enum (usual caveats about the nasty consequences of c+...

type_traits: Implement is_enum (usual caveats about the nasty consequences of c++/19076...).

2004-12-25  Paolo Carlini  <pcarlini@suse.de>

	* include/tr1/type_traits: Implement is_enum (usual caveats about
	the nasty consequences of c++/19076...).
	* testsuite/testsuite_tr1.h: Add ConvType.
	* testsuite/tr1/4_metaprogramming/composite_type_traits/
	is_scalar/is_scalar.cc: New.
	* testsuite/tr1/4_metaprogramming/composite_type_traits/
	is_scalar/typedefs.cc: Likewise.
	* testsuite/tr1/4_metaprogramming/primary_type_categories/
	is_enum/is_enum.cc: Likewise.
	* testsuite/tr1/4_metaprogramming/primary_type_categories/
	is_enum/typedefs.cc: Likewise.

From-SVN: r92604