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[857] | 1 | //=======================================================================
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| 2 | // Copyright 1997, 1998, 1999, 2000 University of Notre Dame.
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| 3 | // Authors: Andrew Lumsdaine, Lie-Quan Lee, Jeremy G. Siek
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| 4 | //
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| 5 | // Distributed under the Boost Software License, Version 1.0. (See
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| 6 | // accompanying file LICENSE_1_0.txt or copy at
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| 7 | // http://www.boost.org/LICENSE_1_0.txt)
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| 8 | //=======================================================================
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| 9 | #ifndef BOOST_GRAPH_DETAIL_IS_SAME_HPP
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| 10 | #define BOOST_GRAPH_DETAIL_IS_SAME_HPP
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| 11 |
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| 12 | #include <boost/pending/ct_if.hpp>
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| 13 |
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| 14 | namespace boost {
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| 15 | struct false_tag;
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| 16 | struct true_tag;
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| 17 |
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| 18 | namespace graph_detail {
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| 19 |
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| 20 | #if !defined BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
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| 21 | template <class U, class V>
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| 22 | struct is_same {
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| 23 | typedef boost::false_tag is_same_tag;
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| 24 | };
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| 25 | template <class U>
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| 26 | struct is_same<U, U> {
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| 27 | typedef boost::true_tag is_same_tag;
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| 28 | };
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| 29 | #else
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| 30 | template <class U, class V>
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| 31 | struct is_same {
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| 32 | enum { Unum = U::num, Vnum = V::num };
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| 33 | typedef typename boost::ct_if< (Unum == Vnum),
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| 34 | boost::true_tag, boost::false_tag>::type is_same_tag;
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| 35 | };
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| 36 | #endif
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| 37 | } // namespace graph_detail
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| 38 | } // namespace boost
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| 39 |
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| 40 | #endif
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