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