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Evaluate mp_bind_front, mp_bind_back inside mp_bind

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This commit is contained in:
Peter Dimov
2018-04-25 14:20:06 +03:00
parent 8307f404f8
commit bad3d5aec3
1 changed files with 30 additions and 20 deletions
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50
include/boost/mp11/bind.hpp
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@@ -1,7 +1,7 @@
#ifndef BOOST_MP11_BIND_HPP_INCLUDED
#define BOOST_MP11_BIND_HPP_INCLUDED
// Copyright 2017 Peter Dimov.
// Copyright 2017, 2018 Peter Dimov.
//
// Distributed under the Boost Software License, Version 1.0.
//
@@ -17,6 +17,25 @@ namespace boost
namespace mp11
{
// mp_bind_front
template<template<class...> class F, class... T> struct mp_bind_front
{
// the indirection through mp_defer works around the language inability
// to expand U... into a fixed parameter list of an alias template
template<class... U> using fn = typename mp_defer<F, T..., U...>::type;
};
template<class Q, class... T> using mp_bind_front_q = mp_bind_front<Q::template fn, T...>;
// mp_bind_back
template<template<class...> class F, class... T> struct mp_bind_back
{
template<class... U> using fn = typename mp_defer<F, U..., T...>::type;
};
template<class Q, class... T> using mp_bind_back_q = mp_bind_back<Q::template fn, T...>;
// mp_arg
template<std::size_t I> struct mp_arg
{
@@ -54,6 +73,16 @@ template<template<class...> class F, class... U, class... T> struct eval_bound_a
using type = typename mp_bind<F, U...>::template fn<T...>;
};
template<template<class...> class F, class... U, class... T> struct eval_bound_arg<mp_bind_front<F, U...>, T...>
{
using type = typename mp_bind_front<F, U...>::template fn<T...>;
};
template<template<class...> class F, class... U, class... T> struct eval_bound_arg<mp_bind_back<F, U...>, T...>
{
using type = typename mp_bind_back<F, U...>::template fn<T...>;
};
} // namespace detail
template<template<class...> class F, class... T> struct mp_bind
@@ -63,25 +92,6 @@ template<template<class...> class F, class... T> struct mp_bind
template<class Q, class... T> using mp_bind_q = mp_bind<Q::template fn, T...>;
// mp_bind_front
template<template<class...> class F, class... T> struct mp_bind_front
{
// the indirection through mp_defer works around the language inability
// to expand U... into a fixed parameter list of an alias template
template<class... U> using fn = typename mp_defer<F, T..., U...>::type;
};
template<class Q, class... T> using mp_bind_front_q = mp_bind_front<Q::template fn, T...>;
// mp_bind_back
template<template<class...> class F, class... T> struct mp_bind_back
{
template<class... U> using fn = typename mp_defer<F, U..., T...>::type;
};
template<class Q, class... T> using mp_bind_back_q = mp_bind_back<Q::template fn, T...>;
} // namespace mp11
} // namespace boost