support Directory Reference

Directory dependency graph for support:

Files
file	apply_to_value_type.hpp
	Similar to mpl::apply but for tagged types.
file	default_tagged.hpp
	Weak tagging.
file	is_tagged.hpp
	type_traits extension
file	overwrite_tagged.hpp
	Hard tagging.
file	tag_of.hpp
	Safe way to acces the tag of a type.
file	value_type_of.hpp
	Consistent way to access the value type of a tagged or untagged type.