multiset/aux_/count_impl.hpp

0001
0002 #ifndef BOOST_MPL_MULTISET_AUX_COUNT_IMPL_HPP_INCLUDED
0003 #define BOOST_MPL_MULTISET_AUX_COUNT_IMPL_HPP_INCLUDED
0004
0005 // Copyright Aleksey Gurtovoy 2003-2004
0006 //
0007 // Distributed under the Boost Software License, Version 1.0.
0008 // (See accompanying file LICENSE_1_0.txt or copy at
0009 // http://www.boost.org/LICENSE_1_0.txt)
0010 //
0011 // See http://www.boost.org/libs/mpl for documentation.
0012
0013 // $Id$
0014 // $Date$
0015 // $Revision$
0016
0017 #include <boost/mpl/multiset/aux_/tag.hpp>
0018 #include <boost/mpl/count_fwd.hpp>
0019 #include <boost/mpl/int.hpp>
0020 #include <boost/mpl/aux_/type_wrapper.hpp>
0021 #include <boost/mpl/aux_/static_cast.hpp>
0022 #include <boost/mpl/aux_/config/static_constant.hpp>
0023 #include <boost/mpl/aux_/config/workaround.hpp>
0024 #include <boost/mpl/aux_/config/msvc.hpp>
0025
0026 #if BOOST_WORKAROUND(BOOST_MSVC, <= 1300)
0027 #   include <boost/mpl/if.hpp>
0028 #   include <boost/type_traits/is_reference.hpp>
0029 #endif
0030
0031 namespace boost { namespace mpl {
0032
0033 #if BOOST_WORKAROUND(BOOST_MSVC, <= 1300)
0034
0035 namespace aux {
0036 template< typename S, typename U >
0037 struct multiset_count_impl
0038     : int_< sizeof(S::key_count(BOOST_MPL_AUX_STATIC_CAST(U*,0))) - 1 >
0039 {
0040 };
0041
0042 template< typename S, typename U >
0043 struct multiset_count_ref_impl
0044 {
0045     typedef U (* u_)();
0046     typedef int_< sizeof(S::ref_key_count(BOOST_MPL_AUX_STATIC_CAST(u_,0))) - 1 > type_;
0047     BOOST_STATIC_CONSTANT(int, value = type_::value);
0048     typedef type_ type;
0049 };
0050 }
0051
0052 template<>
0053 struct count_impl< aux::multiset_tag >
0054 {
0055     template< typename Set, typename Key > struct apply
0056         : if_<
0057               is_reference<Key>
0058             , aux::multiset_count_ref_impl<Set,Key>
0059             , aux::multiset_count_impl<Set,Key>
0060             >::type
0061     {
0062     };
0063 };
0064
0065 #else
0066
0067 template<>
0068 struct count_impl< aux::multiset_tag >
0069 {
0070     template< typename Set, typename Key > struct apply
0071     {
0072         enum { msvc71_wknd_ = sizeof(Set::key_count(BOOST_MPL_AUX_STATIC_CAST(aux::type_wrapper<Key>*,0))) - 1 };
0073         typedef int_< msvc71_wknd_ > type;
0074         BOOST_STATIC_CONSTANT(int, value = msvc71_wknd_);
0075     };
0076 };
0077
0078 #endif // BOOST_WORKAROUND(BOOST_MSVC, <= 1300)
0079
0080 }}
0081
0082 #endif // BOOST_MPL_MULTISET_AUX_COUNT_IMPL_HPP_INCLUDED