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annotate DEPENDENCIES/generic/include/boost/mpl/if.hpp @ 125:34e428693f5d vext

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Vext -> Repoint
author Chris Cannam
date Thu, 14 Jun 2018 11:15:39 +0100
parents c530137014c0
children
rev   line source
Chris@16 1
Chris@16 2 #ifndef BOOST_MPL_IF_HPP_INCLUDED
Chris@16 3 #define BOOST_MPL_IF_HPP_INCLUDED
Chris@16 4
Chris@16 5 // Copyright Aleksey Gurtovoy 2000-2004
Chris@16 6 //
Chris@16 7 // Distributed under the Boost Software License, Version 1.0.
Chris@16 8 // (See accompanying file LICENSE_1_0.txt or copy at
Chris@16 9 // http://www.boost.org/LICENSE_1_0.txt)
Chris@16 10 //
Chris@16 11 // See http://www.boost.org/libs/mpl for documentation.
Chris@16 12
Chris@101 13 // $Id$
Chris@101 14 // $Date$
Chris@101 15 // $Revision$
Chris@16 16
Chris@16 17 #include <boost/mpl/aux_/value_wknd.hpp>
Chris@16 18 #include <boost/mpl/aux_/static_cast.hpp>
Chris@16 19 #include <boost/mpl/aux_/na_spec.hpp>
Chris@16 20 #include <boost/mpl/aux_/lambda_support.hpp>
Chris@16 21 #include <boost/mpl/aux_/config/integral.hpp>
Chris@16 22 #include <boost/mpl/aux_/config/ctps.hpp>
Chris@16 23 #include <boost/mpl/aux_/config/workaround.hpp>
Chris@16 24
Chris@16 25 namespace boost { namespace mpl {
Chris@16 26
Chris@16 27 #if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
Chris@16 28
Chris@16 29 template<
Chris@16 30 bool C
Chris@16 31 , typename T1
Chris@16 32 , typename T2
Chris@16 33 >
Chris@16 34 struct if_c
Chris@16 35 {
Chris@16 36 typedef T1 type;
Chris@16 37 };
Chris@16 38
Chris@16 39 template<
Chris@16 40 typename T1
Chris@16 41 , typename T2
Chris@16 42 >
Chris@16 43 struct if_c<false,T1,T2>
Chris@16 44 {
Chris@16 45 typedef T2 type;
Chris@16 46 };
Chris@16 47
Chris@16 48 // agurt, 05/sep/04: nondescriptive parameter names for the sake of DigitalMars
Chris@16 49 // (and possibly MWCW < 8.0); see http://article.gmane.org/gmane.comp.lib.boost.devel/108959
Chris@16 50 template<
Chris@16 51 typename BOOST_MPL_AUX_NA_PARAM(T1)
Chris@16 52 , typename BOOST_MPL_AUX_NA_PARAM(T2)
Chris@16 53 , typename BOOST_MPL_AUX_NA_PARAM(T3)
Chris@16 54 >
Chris@16 55 struct if_
Chris@16 56 {
Chris@16 57 private:
Chris@16 58 // agurt, 02/jan/03: two-step 'type' definition for the sake of aCC
Chris@16 59 typedef if_c<
Chris@16 60 #if defined(BOOST_MPL_CFG_BCC_INTEGRAL_CONSTANTS)
Chris@16 61 BOOST_MPL_AUX_VALUE_WKND(T1)::value
Chris@16 62 #else
Chris@16 63 BOOST_MPL_AUX_STATIC_CAST(bool, BOOST_MPL_AUX_VALUE_WKND(T1)::value)
Chris@16 64 #endif
Chris@16 65 , T2
Chris@16 66 , T3
Chris@16 67 > almost_type_;
Chris@16 68
Chris@16 69 public:
Chris@16 70 typedef typename almost_type_::type type;
Chris@16 71
Chris@16 72 BOOST_MPL_AUX_LAMBDA_SUPPORT(3,if_,(T1,T2,T3))
Chris@16 73 };
Chris@16 74
Chris@16 75 #else
Chris@16 76
Chris@16 77 // no partial class template specialization
Chris@16 78
Chris@16 79 namespace aux {
Chris@16 80
Chris@16 81 template< bool C >
Chris@16 82 struct if_impl
Chris@16 83 {
Chris@16 84 template< typename T1, typename T2 > struct result_
Chris@16 85 {
Chris@16 86 typedef T1 type;
Chris@16 87 };
Chris@16 88 };
Chris@16 89
Chris@16 90 template<>
Chris@16 91 struct if_impl<false>
Chris@16 92 {
Chris@16 93 template< typename T1, typename T2 > struct result_
Chris@16 94 {
Chris@16 95 typedef T2 type;
Chris@16 96 };
Chris@16 97 };
Chris@16 98
Chris@16 99 } // namespace aux
Chris@16 100
Chris@16 101 template<
Chris@16 102 bool C_
Chris@16 103 , typename T1
Chris@16 104 , typename T2
Chris@16 105 >
Chris@16 106 struct if_c
Chris@16 107 {
Chris@16 108 typedef typename aux::if_impl< C_ >
Chris@16 109 ::template result_<T1,T2>::type type;
Chris@16 110 };
Chris@16 111
Chris@16 112 // (almost) copy & paste in order to save one more
Chris@16 113 // recursively nested template instantiation to user
Chris@16 114 template<
Chris@16 115 typename BOOST_MPL_AUX_NA_PARAM(C_)
Chris@16 116 , typename BOOST_MPL_AUX_NA_PARAM(T1)
Chris@16 117 , typename BOOST_MPL_AUX_NA_PARAM(T2)
Chris@16 118 >
Chris@16 119 struct if_
Chris@16 120 {
Chris@16 121 enum { msvc_wknd_ = BOOST_MPL_AUX_MSVC_VALUE_WKND(C_)::value };
Chris@16 122
Chris@16 123 typedef typename aux::if_impl< BOOST_MPL_AUX_STATIC_CAST(bool, msvc_wknd_) >
Chris@16 124 ::template result_<T1,T2>::type type;
Chris@16 125
Chris@16 126 BOOST_MPL_AUX_LAMBDA_SUPPORT(3,if_,(C_,T1,T2))
Chris@16 127 };
Chris@16 128
Chris@16 129 #endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
Chris@16 130
Chris@16 131 BOOST_MPL_AUX_NA_SPEC(3, if_)
Chris@16 132
Chris@16 133 }}
Chris@16 134
Chris@16 135 #endif // BOOST_MPL_IF_HPP_INCLUDED