Edit: /usr/include/boost/hana/fill.hpp (2216B)
/*!
@file
Defines `boost::hana::fill`.
@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_FILL_HPP
#define BOOST_HANA_FILL_HPP
#include
#include
#include
#include
#include
#include
#include
#include
#include
BOOST_HANA_NAMESPACE_BEGIN
//! @cond
template
constexpr auto fill_t::operator()(Xs&& xs, Value&& value) const {
using S = typename hana::tag_of::type;
using Fill = BOOST_HANA_DISPATCH_IF(fill_impl,
hana::Functor::value
);
#ifndef BOOST_HANA_CONFIG_DISABLE_CONCEPT_CHECKS
static_assert(hana::Functor::value,
"hana::fill(xs, value) requires 'xs' to be a Functor");
#endif
return Fill::apply(static_cast(xs),
static_cast(value));
}
//! @endcond
template
struct fill_impl> : default_ {
template
static constexpr auto apply(Xs&& xs, Value&& v) {
return hana::transform(static_cast(xs),
hana::always(static_cast(v))
);
}
};
template
struct fill_impl::value>> {
//! @cond
template
struct filler {
V const& v;
template
constexpr auto operator()(Xs const& ...xs) const {
return hana::make(((void)xs, v)...);
}
};
//! @endcond
template
static constexpr auto apply(Xs const& xs, V const& v) {
return hana::unpack(xs, filler{v});
}
};
BOOST_HANA_NAMESPACE_END
#endif // !BOOST_HANA_FILL_HPP