Edit: /usr/include/boost/hana/zip_with.hpp (2292B)
/*!
@file
Defines `boost::hana::zip_with`.
@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_ZIP_WITH_HPP
#define BOOST_HANA_ZIP_WITH_HPP
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
BOOST_HANA_NAMESPACE_BEGIN
//! @cond
template
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::value, hana::Sequence::value...
>::value,
"hana::zip_with(f, xs, ys...) requires 'xs' and 'ys...' to be Sequences");
#endif
return zip_with_impl::type>::apply(
static_cast(f),
static_cast(xs),
static_cast(ys)...
);
}
//! @endcond
template
struct zip_with_impl::value>> {
template
static constexpr decltype(auto) transverse(F&& f, Xs&& ...xs) {
return static_cast(f)(hana::at_c(static_cast(xs))...);
}
template
static constexpr auto
zip_helper(std::index_sequence, F&& f, Xs&& ...xs) {
return hana::make(transverse(f, xs...)...);
}
template
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{},
static_cast(f),
static_cast(x), static_cast(xs)...);
}
};
BOOST_HANA_NAMESPACE_END
#endif // !BOOST_HANA_ZIP_WITH_HPP