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112 lines
2.8 KiB
C++
112 lines
2.8 KiB
C++
#ifndef BOOST_MP11_BIND_HPP_INCLUDED
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#define BOOST_MP11_BIND_HPP_INCLUDED
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// Copyright 2017, 2018 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/algorithm.hpp>
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#include <boost/mp11/utility.hpp>
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#include <cstddef>
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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_bind_front
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template<template<class...> class F, class... T> struct mp_bind_front
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{
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// the indirection through mp_defer works around the language inability
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// to expand U... into a fixed parameter list of an alias template
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template<class... U> using fn = typename mp_defer<F, T..., U...>::type;
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};
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template<class Q, class... T> using mp_bind_front_q = mp_bind_front<Q::template fn, T...>;
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// mp_bind_back
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template<template<class...> class F, class... T> struct mp_bind_back
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{
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template<class... U> using fn = typename mp_defer<F, U..., T...>::type;
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};
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template<class Q, class... T> using mp_bind_back_q = mp_bind_back<Q::template fn, T...>;
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// mp_arg
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template<std::size_t I> struct mp_arg
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{
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template<class... T> using fn = mp_at_c<mp_list<T...>, I>;
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};
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using _1 = mp_arg<0>;
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using _2 = mp_arg<1>;
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using _3 = mp_arg<2>;
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using _4 = mp_arg<3>;
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using _5 = mp_arg<4>;
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using _6 = mp_arg<5>;
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using _7 = mp_arg<6>;
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using _8 = mp_arg<7>;
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using _9 = mp_arg<8>;
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// mp_bind
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template<template<class...> class F, class... T> struct mp_bind;
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namespace detail
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{
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template<class V, class... T> struct eval_bound_arg
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{
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using type = V;
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};
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template<std::size_t I, class... T> struct eval_bound_arg<mp_arg<I>, T...>
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{
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using type = typename mp_arg<I>::template fn<T...>;
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};
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template<template<class...> class F, class... U, class... T> struct eval_bound_arg<mp_bind<F, U...>, T...>
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{
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using type = typename mp_bind<F, U...>::template fn<T...>;
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};
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template<template<class...> class F, class... U, class... T> struct eval_bound_arg<mp_bind_front<F, U...>, T...>
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{
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using type = typename mp_bind_front<F, U...>::template fn<T...>;
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};
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template<template<class...> class F, class... U, class... T> struct eval_bound_arg<mp_bind_back<F, U...>, T...>
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{
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using type = typename mp_bind_back<F, U...>::template fn<T...>;
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};
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} // namespace detail
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template<template<class...> class F, class... T> struct mp_bind
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{
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#if BOOST_MP11_WORKAROUND( BOOST_MP11_MSVC, == 1915 )
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private:
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template<class... U> struct _f { using type = F<typename detail::eval_bound_arg<T, U...>::type...>; };
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public:
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template<class... U> using fn = typename _f<U...>::type;
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#else
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template<class... U> using fn = F<typename detail::eval_bound_arg<T, U...>::type...>;
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#endif
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};
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template<class Q, class... T> using mp_bind_q = mp_bind<Q::template fn, T...>;
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} // namespace mp11
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} // namespace boost
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#endif // #ifndef BOOST_MP11_BIND_HPP_INCLUDED
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