mirror of
https://github.com/ecency/ecency-mobile.git
synced 2024-12-23 05:13:04 +03:00
71 lines
2.3 KiB
C++
71 lines
2.3 KiB
C++
|
/*!
|
||
|
|
@file
|
||
|
|
Defines `boost::hana::zip_with`.
|
||
|
|
|
||
|
|
@copyright Louis Dionne 2013-2016
|
||
|
|
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_ZIP_WITH_HPP
|
||
|
|
#define BOOST_HANA_ZIP_WITH_HPP
|
||
|
|
|
||
|
|
#include <boost/hana/fwd/zip_with.hpp>
|
||
|
|
|
||
|
|
#include <boost/hana/at.hpp>
|
||
|
|
#include <boost/hana/concept/sequence.hpp>
|
||
|
|
#include <boost/hana/config.hpp>
|
||
|
|
#include <boost/hana/core/dispatch.hpp>
|
||
|
|
#include <boost/hana/core/make.hpp>
|
||
|
|
#include <boost/hana/detail/fast_and.hpp>
|
||
|
|
#include <boost/hana/length.hpp>
|
||
|
|
|
||
|
|
#include <cstddef>
|
||
|
|
#include <utility>
|
||
|
|
|
||
|
|
|
||
|
|
BOOST_HANA_NAMESPACE_BEGIN
|
||
|
|
//! @cond
|
||
|
|
template <typename F, typename Xs, typename ...Ys>
|
||
|
|
constexpr auto zip_with_t::operator()(F&& f, Xs&& xs, Ys&& ...ys) const {
|
||
|
|
#ifndef BOOST_HANA_CONFIG_DISABLE_CONCEPT_CHECKS
|
||
|
|
static_assert(detail::fast_and<
|
||
|
|
hana::Sequence<Xs>::value, hana::Sequence<Ys>::value...
|
||
|
|
>::value,
|
||
|
|
"hana::zip_with(f, xs, ys...) requires 'xs' and 'ys...' to be Sequences");
|
||
|
|
#endif
|
||
|
|
|
||
|
|
return zip_with_impl<typename hana::tag_of<Xs>::type>::apply(
|
||
|
|
static_cast<F&&>(f),
|
||
|
|
static_cast<Xs&&>(xs),
|
||
|
|
static_cast<Ys&&>(ys)...
|
||
|
|
);
|
||
|
|
}
|
||
|
|
//! @endcond
|
||
|
|
|
||
|
|
template <typename S>
|
||
|
|
struct zip_with_impl<S, when<Sequence<S>::value>> {
|
||
|
|
template <std::size_t N, typename F, typename ...Xs>
|
||
|
|
static constexpr decltype(auto) transverse(F&& f, Xs&& ...xs) {
|
||
|
|
return static_cast<F&&>(f)(hana::at_c<N>(static_cast<Xs&&>(xs))...);
|
||
|
|
}
|
||
|
|
|
||
|
|
template <std::size_t ...N, typename F, typename ...Xs>
|
||
|
|
static constexpr auto
|
||
|
|
zip_helper(std::index_sequence<N...>, F&& f, Xs&& ...xs) {
|
||
|
|
return hana::make<S>(transverse<N>(f, xs...)...);
|
||
|
|
}
|
||
|
|
|
||
|
|
template <typename F, typename X, typename ...Xs>
|
||
|
|
static constexpr auto
|
||
|
|
apply(F&& f, X&& x, Xs&& ...xs) {
|
||
|
|
constexpr std::size_t N = decltype(hana::length(x))::value;
|
||
|
|
return zip_helper(std::make_index_sequence<N>{},
|
||
|
|
static_cast<F&&>(f),
|
||
|
|
static_cast<X&&>(x), static_cast<Xs&&>(xs)...);
|
||
|
|
}
|
||
|
|
};
|
||
|
|
BOOST_HANA_NAMESPACE_END
|
||
|
|
|
||
|
|
#endif // !BOOST_HANA_ZIP_WITH_HPP
|