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/*!
@file
Defines `boost::hana::detail::variadic::split_at`.
@copyright Louis Dionne 2013-2017
Distributed under the Boost Software License, Version 1.0.
(See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
*/
#ifndef BOOST_HANA_DETAIL_VARIADIC_SPLIT_AT_HPP
#define BOOST_HANA_DETAIL_VARIADIC_SPLIT_AT_HPP
#include <boost/hana/config.hpp>
#include <boost/hana/functional/partial.hpp>
#include <boost/hana/functional/reverse_partial.hpp>
#include <cstddef>
BOOST_HANA_NAMESPACE_BEGIN namespace detail { namespace variadic {
template <std::size_t n>
struct split_at_t {
template <typename F, typename X1, typename X2, typename X3, typename X4, typename X5, typename X6, typename X7, typename X8, typename ...Xs>
constexpr decltype(auto) operator()(F&& f, X1&& x1, X2&& x2, X3&& x3, X4&& x4, X5&& x5, X6&& x6, X7&& x7, X8&& x8, Xs&& ...xs) const {
return split_at_t<n - 8>{}(
hana::partial(static_cast<F&&>(f),
static_cast<X1&&>(x1),
static_cast<X2&&>(x2),
static_cast<X3&&>(x3),
static_cast<X4&&>(x4),
static_cast<X5&&>(x5),
static_cast<X6&&>(x6),
static_cast<X7&&>(x7),
static_cast<X8&&>(x8)
),
static_cast<Xs&&>(xs)...
);
}
};
template <>
struct split_at_t<0> {
template <typename F, typename ...Xs>
constexpr decltype(auto) operator()(F&& f, Xs&& ...xs) const {
return static_cast<F&&>(f)()(static_cast<Xs&&>(xs)...);
}
};
template <>
struct split_at_t<1> {
template <typename F, typename X1, typename ...Xs>
constexpr decltype(auto) operator()(F&& f, X1&& x1, Xs&& ...xs) const {
return static_cast<F&&>(f)(
static_cast<X1&&>(x1)
)(static_cast<Xs&&>(xs)...);
}
};
template <>
struct split_at_t<2> {
template <typename F, typename X1, typename X2, typename ...Xs>
constexpr decltype(auto) operator()(F&& f, X1&& x1, X2&& x2, Xs&& ...xs) const {
return static_cast<F&&>(f)(
static_cast<X1&&>(x1),
static_cast<X2&&>(x2)
)(static_cast<Xs&&>(xs)...);
}
};
template <>
struct split_at_t<3> {
template <typename F, typename X1, typename X2, typename X3, typename ...Xs>
constexpr decltype(auto) operator()(F&& f, X1&& x1, X2&& x2, X3&& x3, Xs&& ...xs) const {
return static_cast<F&&>(f)(
static_cast<X1&&>(x1),
static_cast<X2&&>(x2),
static_cast<X3&&>(x3)
)(static_cast<Xs&&>(xs)...);
}
};
template <>
struct split_at_t<4> {
template <typename F, typename X1, typename X2, typename X3, typename X4, typename ...Xs>
constexpr decltype(auto) operator()(F&& f, X1&& x1, X2&& x2, X3&& x3, X4&& x4, Xs&& ...xs) const {
return static_cast<F&&>(f)(
static_cast<X1&&>(x1),
static_cast<X2&&>(x2),
static_cast<X3&&>(x3),
static_cast<X4&&>(x4)
)(static_cast<Xs&&>(xs)...);
}
};
template <>
struct split_at_t<5> {
template <typename F, typename X1, typename X2, typename X3, typename X4, typename X5, typename ...Xs>
constexpr decltype(auto) operator()(F&& f, X1&& x1, X2&& x2, X3&& x3, X4&& x4, X5&& x5, Xs&& ...xs) const {
return static_cast<F&&>(f)(
static_cast<X1&&>(x1),
static_cast<X2&&>(x2),
static_cast<X3&&>(x3),
static_cast<X4&&>(x4),
static_cast<X5&&>(x5)
)(static_cast<Xs&&>(xs)...);
}
};
template <>
struct split_at_t<6> {
template <typename F, typename X1, typename X2, typename X3, typename X4, typename X5, typename X6, typename ...Xs>
constexpr decltype(auto) operator()(F&& f, X1&& x1, X2&& x2, X3&& x3, X4&& x4, X5&& x5, X6&& x6, Xs&& ...xs) const {
return static_cast<F&&>(f)(
static_cast<X1&&>(x1),
static_cast<X2&&>(x2),
static_cast<X3&&>(x3),
static_cast<X4&&>(x4),
static_cast<X5&&>(x5),
static_cast<X6&&>(x6)
)(static_cast<Xs&&>(xs)...);
}
};
template <>
struct split_at_t<7> {
template <typename F, typename X1, typename X2, typename X3, typename X4, typename X5, typename X6, typename X7, typename ...Xs>
constexpr decltype(auto) operator()(F&& f, X1&& x1, X2&& x2, X3&& x3, X4&& x4, X5&& x5, X6&& x6, X7&& x7, Xs&& ...xs) const {
return static_cast<F&&>(f)(
static_cast<X1&&>(x1),
static_cast<X2&&>(x2),
static_cast<X3&&>(x3),
static_cast<X4&&>(x4),
static_cast<X5&&>(x5),
static_cast<X6&&>(x6),
static_cast<X7&&>(x7)
)(static_cast<Xs&&>(xs)...);
}
};
template <std::size_t n>
struct _makesplit_at_t {
template <typename ...Xs>
constexpr decltype(auto) operator()(Xs&& ...xs) const {
return hana::reverse_partial(split_at_t<n>{},
static_cast<Xs&&>(xs)...);
}
};
template <std::size_t n>
constexpr _makesplit_at_t<n> split_at{};
}} BOOST_HANA_NAMESPACE_END
#endif // !BOOST_HANA_DETAIL_VARIADIC_SPLIT_AT_HPP
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