forked from boostorg/fusion
69 lines
1.7 KiB
C++
69 lines
1.7 KiB
C++
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/*=============================================================================
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Copyright (c) 2001-2006 Joel de Guzman
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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==============================================================================*/
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#if !defined(FUSION_COUNT_09162005_0158)
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#define FUSION_COUNT_09162005_0158
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#include <boost/mpl/or.hpp>
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#include <boost/type_traits/is_convertible.hpp>
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#include <boost/fusion/support/detail/access.hpp>
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namespace boost { namespace fusion { namespace detail
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{
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template <bool is_convertible>
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struct compare_convertible;
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// T1 is convertible to T2 or vice versa
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template <>
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struct compare_convertible<true>
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{
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template <typename T1, typename T2>
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static bool
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call(T1 const& x, T2 const& y)
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{
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return x == y;
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}
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};
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// T1 is NOT convertible to T2 NOR vice versa
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template <>
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struct compare_convertible<false>
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{
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template <typename T1, typename T2>
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static bool
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call(T1 const&, T2 const&)
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{
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return false;
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}
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};
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template <typename T1>
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struct count_compare
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{
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typedef typename detail::call_param<T1>::type param;
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count_compare(param x)
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: x(x) {}
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template <typename T2>
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bool
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operator()(T2 const& y)
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{
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return
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compare_convertible<
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mpl::or_<
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is_convertible<T1, T2>
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, is_convertible<T2, T1>
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>::value
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>::call(x, y);
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}
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param x;
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};
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}}}
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#endif
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