Edit: /usr/include/boost/hana/reverse.hpp (1802B)
/*!
@file
Defines `boost::hana::reverse`.
@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_REVERSE_HPP
#define BOOST_HANA_REVERSE_HPP
#include
#include
#include
#include
#include
#include
#include
#include
#include
BOOST_HANA_NAMESPACE_BEGIN
//! @cond
template
constexpr auto reverse_t::operator()(Xs&& xs) const {
using S = typename hana::tag_of::type;
using Reverse = BOOST_HANA_DISPATCH_IF(reverse_impl,
hana::Sequence::value
);
#ifndef BOOST_HANA_CONFIG_DISABLE_CONCEPT_CHECKS
static_assert(hana::Sequence::value,
"hana::reverse(xs) requires 'xs' to be a Sequence");
#endif
return Reverse::apply(static_cast(xs));
}
//! @endcond
template
struct reverse_impl> : default_ {
template
static constexpr auto reverse_helper(Xs&& xs, std::index_sequence) {
return hana::make(
hana::at_c(static_cast(xs))...
);
}
template
static constexpr auto apply(Xs&& xs) {
constexpr std::size_t N = decltype(hana::length(xs))::value;
return reverse_helper(static_cast(xs), std::make_index_sequence{});
}
};
BOOST_HANA_NAMESPACE_END
#endif // !BOOST_HANA_REVERSE_HPP