id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
6577	Add meta-function to extract the raw type, meta-function to compare raw types	Daryle Walker	John Maddock	"Based on the work I did on change-set [77046], can we add my two type-traits to the general library?

The first one extracts the raw type, that removes the top-level reference, const, and/or volatile qualifiers from a type expression.  You need the raw type if you want to make a new object and/or apply your own transformations.

{{{
template < typename T >
struct remove_cv_ref
{
    typedef typename ::boost::remove_cv<
     typename ::boost::remove_reference<
     typename ::boost::remove_cv<T>::type>::type>::type  type;
};
}}}

Unlike my patch code, the version here can handle ""T const & volatile"".  (I don't think automatic code can add a cv-qualifier after a reference, that's why I didn't have it.  We have to be more general here.)

The second trait would work like is_same, but compare the raw types.

{{{
template < typename T, typename U > 
struct is_related 
    : public ::boost::is_same< 
     typename ::boost::detail::remove_cv_ref<T>::type, 
     typename ::boost::detail::remove_cv_ref<U>::type > 
{};
}}}

Like the guy I got the idea from, you could use a template alias to implement this in C++2011.
"	Feature Requests	closed	Boost 1.50.0	type_traits	Boost Development Trunk	Not Applicable	obsolete