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// Copyright David Abrahams 2005. Distributed under the Boost
// Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
#ifndef BOOST_PARAMETER_BINDING_DWA200558_HPP
# define BOOST_PARAMETER_BINDING_DWA200558_HPP
# include <boost/mpl/apply.hpp>
# include <boost/mpl/assert.hpp>
# include <boost/mpl/and.hpp>
# include <boost/parameter/aux_/result_of0.hpp>
# include <boost/parameter/aux_/void.hpp>
# include <boost/type_traits/is_same.hpp>
# if BOOST_WORKAROUND(BOOST_MSVC, < 1300)
# include <boost/mpl/eval_if.hpp>
# endif
namespace boost { namespace parameter {
// A metafunction that, given an argument pack, returns the type of
// the parameter identified by the given keyword. If no such
// parameter has been specified, returns Default
# if BOOST_WORKAROUND(BOOST_MSVC, <= 1300) \
|| BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x564))
template <class Parameters, class Keyword, class Default>
struct binding0
{
typedef typename mpl::apply_wrap3<
typename Parameters::binding,Keyword,Default,mpl::true_
>::type type;
BOOST_MPL_ASSERT_NOT((
mpl::and_<
is_same<Default, void_>
, is_same<type, void_>
>
));
};
# endif
template <class Parameters, class Keyword, class Default = void_>
# if !BOOST_WORKAROUND(BOOST_MSVC, < 1300)
struct binding
# else
struct binding_eti
# endif
{
# if BOOST_WORKAROUND(BOOST_MSVC, <= 1300) \
|| BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x564))
typedef typename mpl::eval_if<
mpl::is_placeholder<Parameters>
, mpl::identity<int>
, binding0<Parameters,Keyword,Default>
>::type type;
# else
typedef typename mpl::apply_wrap3<
typename Parameters::binding,Keyword,Default,mpl::true_
>::type type;
BOOST_MPL_ASSERT_NOT((
mpl::and_<
is_same<Default, void_>
, is_same<type, void_>
>
));
# endif
# if !BOOST_WORKAROUND(BOOST_MSVC, < 1300)
BOOST_MPL_AUX_LAMBDA_SUPPORT(3,binding,(Parameters,Keyword,Default))
# endif
};
# if BOOST_WORKAROUND(BOOST_MSVC, < 1300)
template <class Parameters, class Keyword, class Default = void_>
struct binding
{
typedef typename mpl::eval_if<
is_same<Parameters, int>
, mpl::identity<int>
, binding_eti<Parameters, Keyword, Default>
>::type type;
BOOST_MPL_AUX_LAMBDA_SUPPORT(3,binding,(Parameters,Keyword,Default))
};
# endif
// A metafunction that, given an argument pack, returns the type of
// the parameter identified by the given keyword. If no such
// parameter has been specified, returns the type returned by invoking
// DefaultFn
template <class Parameters, class Keyword, class DefaultFn>
struct lazy_binding
{
typedef typename mpl::apply_wrap3<
typename Parameters::binding
, Keyword
, typename aux::result_of0<DefaultFn>::type
, mpl::true_
>::type type;
};
}} // namespace boost::parameter
#endif // BOOST_PARAMETER_BINDING_DWA200558_HPP
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