source: NonGTP/Boost/boost/graph/detail/is_same.hpp @ 857

Revision 857, 1.2 KB checked in by igarcia, 19 years ago (diff)
RevLine 
[857]1//=======================================================================
2// Copyright 1997, 1998, 1999, 2000 University of Notre Dame.
3// Authors: Andrew Lumsdaine, Lie-Quan Lee, Jeremy G. Siek
4//
5// Distributed under the Boost Software License, Version 1.0. (See
6// accompanying file LICENSE_1_0.txt or copy at
7// http://www.boost.org/LICENSE_1_0.txt)
8//=======================================================================
9#ifndef BOOST_GRAPH_DETAIL_IS_SAME_HPP
10#define BOOST_GRAPH_DETAIL_IS_SAME_HPP
11
12#include <boost/pending/ct_if.hpp>
13
14namespace boost {
15  struct false_tag;
16  struct true_tag;
17
18  namespace graph_detail {
19   
20#if !defined BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
21    template <class U, class V>
22    struct is_same {
23      typedef boost::false_tag is_same_tag;
24    };
25    template <class U>
26    struct is_same<U, U> {
27      typedef boost::true_tag is_same_tag;
28    };
29#else
30    template <class U, class V>
31    struct is_same {
32      enum { Unum = U::num, Vnum = V::num };
33      typedef typename boost::ct_if< (Unum == Vnum),
34               boost::true_tag, boost::false_tag>::type is_same_tag;
35    };
36#endif
37  } // namespace graph_detail
38} // namespace boost
39
40#endif
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