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1 /*=============================================================================
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2 Copyright (c) 2001-2011 Joel de Guzman
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3
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4 Distributed under the Boost Software License, Version 1.0. (See accompanying
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5 file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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6 ==============================================================================*/
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7 #if !defined(FUSION_COUNT_09162005_0158)
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8 #define FUSION_COUNT_09162005_0158
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9
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10 #include <boost/fusion/support/config.hpp>
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11 #include <boost/config.hpp>
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12 #include <boost/mpl/or.hpp>
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13 #include <boost/type_traits/is_convertible.hpp>
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14 #include <boost/fusion/support/detail/access.hpp>
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15
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16 #if defined (BOOST_MSVC)
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17 # pragma warning(push)
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18 # pragma warning (disable: 4512) // assignment operator could not be generated.
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19 #endif
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20
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21 namespace boost { namespace fusion { namespace detail
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22 {
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23 template <bool is_convertible>
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24 struct compare_convertible;
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25
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26 // T1 is convertible to T2 or vice versa
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27 template <>
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28 struct compare_convertible<true>
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29 {
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30 template <typename T1, typename T2>
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31 BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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32 static bool
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33 call(T1 const& x, T2 const& y)
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34 {
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35 return x == y;
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36 }
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37 };
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38
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39 // T1 is NOT convertible to T2 NOR vice versa
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40 template <>
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41 struct compare_convertible<false>
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42 {
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43 template <typename T1, typename T2>
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44 BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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45 static bool
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46 call(T1 const&, T2 const&)
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47 {
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48 return false;
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49 }
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50 };
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51
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52 template <typename T1>
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53 struct count_compare
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54 {
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55 typedef typename detail::call_param<T1>::type param;
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56 BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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57 count_compare(param in_x)
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58 : x(in_x) {}
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59
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60 template <typename T2>
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61 BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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62 bool
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63 operator()(T2 const& y) const
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64 {
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65 return
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66 compare_convertible<
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67 mpl::or_<
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68 is_convertible<T1, T2>
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69 , is_convertible<T2, T1>
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70 >::value
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71 >::call(x, y);
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72 }
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73
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74 param x;
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75 };
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76 }}}
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77
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78 #if defined (BOOST_MSVC)
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79 # pragma warning(pop)
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80 #endif
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81
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82 #endif
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83
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