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// Boost.TypeErasure library
//
// Copyright 2011 Steven Watanabe
//
// Distributed under the Boost Software License Version 1.0. (See
// accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
//
// $Id$
#ifndef BOOST_TYPE_ERASURE_SAME_TYPE_HPP_INCLUDED
#define BOOST_TYPE_ERASURE_SAME_TYPE_HPP_INCLUDED
namespace boost {
namespace type_erasure {
/**
* A built in concept that indicates that two
* types are the same. Either T or U or both
* can be placeholders.
*
* \warning Any number of instances of @ref deduced
* can be connected with @ref same_type, but there
* should be at most one regular placeholder in
* the group. same_type<_a, _b> is not allowed.
* The reason for this is that the library needs
* to normalize all the placeholders, and in this
* context there is no way to decide whether to
* use @ref _a or @ref _b.
*/
template<class T, class U>
struct same_type {};
}
}
#endif