Edit: /usr/include/boost/hana/insert_range.hpp (2171B)
/*!
@file
Defines `boost::hana::insert_range`.
@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_INSERT_RANGE_HPP
#define BOOST_HANA_INSERT_RANGE_HPP
#include
#include
#include
#include
#include
#include
#include
#include
#include
BOOST_HANA_NAMESPACE_BEGIN
//! @cond
template
constexpr auto insert_range_t::operator()(Xs&& xs, N&& n, Elements&& elements) const {
using S = typename hana::tag_of::type;
using InsertRange = BOOST_HANA_DISPATCH_IF(insert_range_impl,
hana::Sequence::value &&
hana::Foldable::value
);
#ifndef BOOST_HANA_CONFIG_DISABLE_CONCEPT_CHECKS
static_assert(hana::Sequence::value,
"hana::insert_range(xs, n, elements) requires 'xs' to be a Sequence");
static_assert(hana::Foldable::value,
"hana::insert_range(xs, n, elements) requires 'elements' to be a Foldable");
#endif
return InsertRange::apply(static_cast(xs),
static_cast(n),
static_cast(elements));
}
//! @endcond
template
struct insert_range_impl> {
template
static constexpr auto apply(Xs&& xs, N const& n, Elements&& e) {
return hana::concat(
hana::concat(
hana::take_front(xs, n),
hana::to(static_cast(e))
),
hana::drop_front(xs, n)
);
}
};
BOOST_HANA_NAMESPACE_END
#endif // !BOOST_HANA_INSERT_RANGE_HPP