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63 lines
1.9 KiB
C++
63 lines
1.9 KiB
C++
#ifndef BOOST_MP11_DETAIL_MP_FOLD_HPP_INCLUDED
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#define BOOST_MP11_DETAIL_MP_FOLD_HPP_INCLUDED
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// Copyright 2015-2017 Peter Dimov.
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//
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// Distributed under the Boost Software License, Version 1.0.
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//
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// See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt
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#include <boost/mp11/detail/config.hpp>
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namespace boost
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{
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namespace mp11
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{
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// mp_fold<L, V, F>
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namespace detail
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{
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template<class L, class V, template<class...> class F> struct mp_fold_impl
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{
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// An error "no type named 'type'" here means that the first argument to mp_fold is not a list
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};
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#if BOOST_MP11_WORKAROUND( BOOST_MP11_MSVC, <= 1800 )
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template<template<class...> class L, class... T, class V, template<class...> class F> struct mp_fold_impl<L<T...>, V, F>
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{
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static_assert( sizeof...(T) == 0, "T... must be empty" );
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using type = V;
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};
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#else
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template<template<class...> class L, class V, template<class...> class F> struct mp_fold_impl<L<>, V, F>
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{
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using type = V;
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};
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#endif
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template<template<class...> class L, class T1, class... T, class V, template<class...> class F> struct mp_fold_impl<L<T1, T...>, V, F>
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{
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using type = typename mp_fold_impl<L<T...>, F<V, T1>, F>::type;
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};
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template<template<class...> class L, class T1, class T2, class T3, class T4, class T5, class T6, class T7, class T8, class T9, class T10, class... T, class V, template<class...> class F> struct mp_fold_impl<L<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T...>, V, F>
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{
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using type = typename mp_fold_impl<L<T...>, F<F<F<F<F<F<F<F<F<F<V, T1>, T2>, T3>, T4>, T5>, T6>, T7>, T8>, T9>, T10>, F>::type;
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};
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} // namespace detail
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template<class L, class V, template<class...> class F> using mp_fold = typename detail::mp_fold_impl<L, V, F>::type;
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template<class L, class V, class Q> using mp_fold_q = mp_fold<L, V, Q::template fn>;
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} // namespace mp11
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} // namespace boost
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#endif // #ifndef BOOST_MP11_DETAIL_MP_FOLD_HPP_INCLUDED
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