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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/parameter/aux_/void.hpp>
#include <boost/parameter/config.hpp>
#if defined(BOOST_PARAMETER_CAN_USE_MP11)
#include <boost/mp11/integral.hpp>
#include <boost/mp11/list.hpp>
#include <boost/mp11/utility.hpp>
#include <type_traits>
#else
#include <boost/mpl/bool.hpp>
#include <boost/mpl/if.hpp>
#include <boost/mpl/eval_if.hpp>
#include <boost/mpl/identity.hpp>
#include <boost/mpl/apply_wrap.hpp>
#include <boost/mpl/assert.hpp>
#include <boost/type_traits/is_same.hpp>
#endif
namespace boost { namespace parameter {
// A metafunction that, given an argument pack, returns the reference type
// of the parameter identified by the given keyword. If no such parameter
// has been specified, returns Default
template <typename Parameters, typename Keyword, typename Default>
struct binding0
{
#if defined(BOOST_PARAMETER_CAN_USE_MP11)
using type = ::boost::mp11::mp_apply_q<
typename Parameters::binding
, ::boost::mp11::mp_list<Keyword,Default,::boost::mp11::mp_true>
>;
static_assert(
::boost::mp11::mp_if<
::std::is_same<Default,::boost::parameter::void_>
, ::boost::mp11::mp_if<
::std::is_same<type,::boost::parameter::void_>
, ::boost::mp11::mp_false
, ::boost::mp11::mp_true
>
, ::boost::mp11::mp_true
>::value
, "required parameters must not result in void_ type"
);
#else // !defined(BOOST_PARAMETER_CAN_USE_MP11)
typedef typename ::boost::mpl::apply_wrap3<
typename Parameters::binding
, Keyword
, Default
, ::boost::mpl::true_
>::type type;
BOOST_MPL_ASSERT((
typename ::boost::mpl::eval_if<
::boost::is_same<Default,::boost::parameter::void_>
, ::boost::mpl::if_<
::boost::is_same<type,::boost::parameter::void_>
, ::boost::mpl::false_
, ::boost::mpl::true_
>
, ::boost::mpl::true_
>::type
));
#endif // BOOST_PARAMETER_CAN_USE_MP11
};
#if defined(BOOST_PARAMETER_CAN_USE_MP11)
template <typename Placeholder, typename Keyword, typename Default>
struct binding1
{
using type = ::boost::mp11::mp_apply_q<
Placeholder
, ::boost::mp11::mp_list<Keyword,Default,::boost::mp11::mp_true>
>;
static_assert(
::boost::mp11::mp_if<
::std::is_same<Default,::boost::parameter::void_>
, ::boost::mp11::mp_if<
::std::is_same<type,::boost::parameter::void_>
, ::boost::mp11::mp_false
, ::boost::mp11::mp_true
>
, ::boost::mp11::mp_true
>::value
, "required parameters must not result in void_ type"
);
};
#endif // BOOST_PARAMETER_CAN_USE_MP11
}} // namespace boost::parameter
#include <boost/parameter/aux_/is_placeholder.hpp>
namespace boost { namespace parameter {
template <
typename Parameters
, typename Keyword
, typename Default = ::boost::parameter::void_
>
struct binding
#if !defined(BOOST_PARAMETER_CAN_USE_MP11)
: ::boost::mpl::eval_if<
::boost::parameter::aux::is_mpl_placeholder<Parameters>
, ::boost::mpl::identity<int>
, ::boost::parameter::binding0<Parameters,Keyword,Default>
>
#endif
{
#if defined(BOOST_PARAMETER_CAN_USE_MP11)
using type = typename ::boost::mp11::mp_if<
::boost::parameter::aux::is_mpl_placeholder<Parameters>
, ::boost::mp11::mp_identity<int>
, ::boost::mp11::mp_if<
::boost::parameter::aux::is_mp11_placeholder<Parameters>
, ::boost::parameter::binding1<Parameters,Keyword,Default>
, ::boost::parameter::binding0<Parameters,Keyword,Default>
>
>::type;
#endif
};
}} // namespace boost::parameter
#include <boost/parameter/aux_/result_of0.hpp>
namespace boost { namespace parameter {
// A metafunction that, given an argument pack, returns the reference type
// of the parameter identified by the given keyword. If no such parameter
// has been specified, returns the type returned by invoking DefaultFn
template <typename Parameters, typename Keyword, typename DefaultFn>
struct lazy_binding
{
#if defined(BOOST_PARAMETER_CAN_USE_MP11)
using type = ::boost::mp11::mp_apply_q<
typename Parameters::binding
, ::boost::mp11::mp_list<
Keyword
, typename ::boost::parameter::aux::result_of0<DefaultFn>::type
, ::boost::mp11::mp_true
>
>;
#else
typedef typename ::boost::mpl::apply_wrap3<
typename Parameters::binding
, Keyword
, typename ::boost::parameter::aux::result_of0<DefaultFn>::type
, ::boost::mpl::true_
>::type type;
#endif // BOOST_PARAMETER_CAN_USE_MP11
};
}} // namespace boost::parameter
#endif // include guard
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