Boost C++ Libraries

boost/mp11/detail/mp_rename.hpp

#ifndef BOOST_MP11_DETAIL_MP_RENAME_HPP_INCLUDED
#define BOOST_MP11_DETAIL_MP_RENAME_HPP_INCLUDED

//  Copyright 2015-2023 Peter Dimov.
//
//  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

#include <boost/mp11/detail/mp_defer.hpp>
#include <boost/mp11/detail/mp_value.hpp>
#include <boost/mp11/detail/config.hpp>

namespace boost
{
namespace mp11
{

// mp_rename<L, B>
namespace detail
{

template<class L, template<class...> class B> struct mp_rename_impl
{
// An error "no type named 'type'" here means that the first argument to mp_rename is not a list
};

template<template<class...> class L, class... T, template<class...> class B> struct mp_rename_impl<L<T...>, B>: mp_defer<B, T...>
{
};

#if defined(BOOST_MP11_HAS_TEMPLATE_AUTO)

template<template<auto...> class L, auto... A, template<class...> class B> struct mp_rename_impl<L<A...>, B>: mp_defer<B, mp_value<A>...>
{
};

#endif

} // namespace detail

template<class L, template<class...> class B> using mp_rename = typename detail::mp_rename_impl<L, B>::type;

// mp_apply<F, L>
template<template<class...> class F, class L> using mp_apply = typename detail::mp_rename_impl<L, F>::type;

// mp_apply_q<Q, L>
template<class Q, class L> using mp_apply_q = typename detail::mp_rename_impl<L, Q::template fn>::type;

} // namespace mp11
} // namespace boost

#endif // #ifndef BOOST_MP11_DETAIL_MP_RENAME_HPP_INCLUDED