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Add mp_compose

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Peter Dimov
2020-03-08 02:33:56 +02:00
parent 1f634c7071
commit 5d25ec4ad8
3 changed files with 89 additions and 1 deletions
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30
include/boost/mp11/utility.hpp
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@@ -1,7 +1,7 @@
#ifndef BOOST_MP11_UTILITY_HPP_INCLUDED
#define BOOST_MP11_UTILITY_HPP_INCLUDED
// Copyright 2015, 2017, 2019 Peter Dimov.
// Copyright 2015-2020 Peter Dimov.
//
// Distributed under the Boost Software License, Version 1.0.
//
@@ -9,6 +9,8 @@
// http://www.boost.org/LICENSE_1_0.txt
#include <boost/mp11/integral.hpp>
#include <boost/mp11/detail/mp_list.hpp>
#include <boost/mp11/detail/mp_fold.hpp>
#include <boost/mp11/detail/config.hpp>
namespace boost
@@ -230,6 +232,32 @@ template<template<class...> class P> struct mp_not_fn
template<class Q> using mp_not_fn_q = mp_not_fn<Q::template fn>;
// mp_compose
namespace detail
{
template<class T, class Q> using mp_reverse_invoke_q = mp_invoke_q<Q, T>;
} // namespace detail
#if !BOOST_MP11_WORKAROUND( BOOST_MP11_MSVC, < 1900 )
template<template<class...> class... F> struct mp_compose
{
template<class T> using fn = mp_fold<mp_list<mp_quote<F>...>, T, detail::mp_reverse_invoke_q>;
};
template<class... Q> using mp_compose_q = mp_compose<Q::template fn...>;
#else
template<class... Q> struct mp_compose_q
{
template<class T> using fn = mp_fold<mp_list<Q...>, T, detail::mp_reverse_invoke_q>;
};
#endif
} // namespace mp11
} // namespace boost