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// Copyright David Abrahams, Daniel Wallin 2003.
// 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_AUX_PACK_TAG_TYPE_HPP
#define BOOST_PARAMETER_AUX_PACK_TAG_TYPE_HPP
namespace boost { namespace parameter { namespace aux {
// helper for tag_type<...>, below.
template <typename T>
struct get_tag_type0
{
typedef typename T::key_type type;
};
}}} // namespace boost::parameter::aux
#include <boost/parameter/deduced.hpp>
#include <boost/parameter/config.hpp>
#if defined(BOOST_PARAMETER_CAN_USE_MP11)
#include <boost/mp11/utility.hpp>
#else
#include <boost/mpl/eval_if.hpp>
#endif
namespace boost { namespace parameter { namespace aux {
template <typename T>
struct get_tag_type
#if defined(BOOST_PARAMETER_CAN_USE_MP11)
: ::boost::mp11::mp_if<
#else
: ::boost::mpl::eval_if<
#endif
::boost::parameter::aux::is_deduced0<T>
, ::boost::parameter::aux::get_tag_type0<typename T::key_type>
, ::boost::parameter::aux::get_tag_type0<T>
>
{
};
}}} // namespace boost::parameter::aux
#include <boost/parameter/required.hpp>
#include <boost/parameter/optional.hpp>
#if defined(BOOST_PARAMETER_CAN_USE_MP11)
#include <boost/mp11/integral.hpp>
namespace boost { namespace parameter { namespace aux {
template <typename T>
using tag_type = ::boost::mp11::mp_if<
::boost::mp11::mp_if<
::boost::parameter::aux::is_optional<T>
, ::boost::mp11::mp_true
, ::boost::parameter::aux::is_required<T>
>
, ::boost::parameter::aux::get_tag_type<T>
, ::boost::mp11::mp_identity<T>
>;
}}} // namespace boost::parameter::aux
#else // !defined(BOOST_PARAMETER_CAN_USE_MP11)
#include <boost/mpl/bool.hpp>
#include <boost/mpl/if.hpp>
#include <boost/mpl/identity.hpp>
namespace boost { namespace parameter { namespace aux {
template <typename T>
struct tag_type
: ::boost::mpl::eval_if<
typename ::boost::mpl::if_<
::boost::parameter::aux::is_optional<T>
, ::boost::mpl::true_
, ::boost::parameter::aux::is_required<T>
>::type
, ::boost::parameter::aux::get_tag_type<T>
, ::boost::mpl::identity<T>
>
{
};
}}} // namespace boost::parameter::aux
#endif // BOOST_PARAMETER_CAN_USE_MP11
#endif // include guard
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