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os/ossrv/ossrv_pub/boost_apis/boost/parameter/binding.hpp
author sl
Tue, 10 Jun 2014 14:32:02 +0200
changeset 1 260cb5ec6c19
permissions -rw-r--r--
Update contrib. 
     1 // Copyright David Abrahams 2005. Distributed under the Boost

     2 // Software License, Version 1.0. (See accompanying

     3 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)

     4 #ifndef BOOST_PARAMETER_BINDING_DWA200558_HPP

     5 # define BOOST_PARAMETER_BINDING_DWA200558_HPP

     6 

     7 # include <boost/mpl/apply.hpp>

     8 # include <boost/mpl/assert.hpp>

     9 # include <boost/mpl/and.hpp>

    10 # include <boost/parameter/aux_/result_of0.hpp>

    11 # include <boost/parameter/aux_/void.hpp>

    12 # include <boost/type_traits/is_same.hpp>

    13 

    14 # if BOOST_WORKAROUND(BOOST_MSVC, < 1300)

    15 #  include <boost/mpl/eval_if.hpp>

    16 # endif

    17 

    18 namespace boost { namespace parameter { 

    19 

    20 // A metafunction that, given an argument pack, returns the type of

    21 // the parameter identified by the given keyword.  If no such

    22 // parameter has been specified, returns Default

    23 

    24 # if BOOST_WORKAROUND(BOOST_MSVC, <= 1300) \

    25   || BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x564))

    26 template <class Parameters, class Keyword, class Default>

    27 struct binding0

    28 {

    29     typedef typename mpl::apply_wrap3<

    30         typename Parameters::binding,Keyword,Default,mpl::true_

    31     >::type type;

    32 

    33     BOOST_MPL_ASSERT_NOT((

    34         mpl::and_<

    35             is_same<Default, void_>

    36           , is_same<type, void_>

    37         >

    38     ));

    39 };

    40 # endif

    41 

    42 template <class Parameters, class Keyword, class Default = void_>

    43 # if !BOOST_WORKAROUND(BOOST_MSVC, < 1300)

    44 struct binding

    45 # else

    46 struct binding_eti

    47 # endif

    48 {

    49 # if BOOST_WORKAROUND(BOOST_MSVC, <= 1300) \

    50   || BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x564))

    51     typedef typename mpl::eval_if<

    52         mpl::is_placeholder<Parameters>

    53       , mpl::identity<int>

    54       , binding0<Parameters,Keyword,Default>

    55     >::type type;

    56 # else

    57     typedef typename mpl::apply_wrap3<

    58         typename Parameters::binding,Keyword,Default,mpl::true_

    59     >::type type;

    60 

    61     BOOST_MPL_ASSERT_NOT((

    62         mpl::and_<

    63             is_same<Default, void_>

    64           , is_same<type, void_>

    65         >

    66     ));

    67 # endif

    68 

    69 # if !BOOST_WORKAROUND(BOOST_MSVC, < 1300)

    70     BOOST_MPL_AUX_LAMBDA_SUPPORT(3,binding,(Parameters,Keyword,Default))

    71 # endif

    72 };

    73 

    74 # if BOOST_WORKAROUND(BOOST_MSVC, < 1300)

    75 template <class Parameters, class Keyword, class Default = void_>

    76 struct binding

    77 {

    78     typedef typename mpl::eval_if<

    79         is_same<Parameters, int>

    80       , mpl::identity<int>

    81       , binding_eti<Parameters, Keyword, Default>

    82     >::type type;

    83 

    84     BOOST_MPL_AUX_LAMBDA_SUPPORT(3,binding,(Parameters,Keyword,Default))

    85 };

    86 # endif

    87 

    88 // A metafunction that, given an argument pack, returns the type of

    89 // the parameter identified by the given keyword.  If no such

    90 // parameter has been specified, returns the type returned by invoking

    91 // DefaultFn

    92 template <class Parameters, class Keyword, class DefaultFn>

    93 struct lazy_binding

    94 {

    95   typedef typename mpl::apply_wrap3<

    96       typename Parameters::binding

    97     , Keyword

    98     , typename aux::result_of0<DefaultFn>::type

    99     , mpl::true_

   100   >::type type;

   101 };

   102 

   103 

   104 }} // namespace boost::parameter

   105 

   106 #endif // BOOST_PARAMETER_BINDING_DWA200558_HPP
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