mirror of
https://github.com/ecency/ecency-mobile.git
synced 2024-12-23 05:13:04 +03:00
75 lines
2.2 KiB
C++
75 lines
2.2 KiB
C++
/*!
|
|
@file
|
|
Defines `boost::hana::fill`.
|
|
|
|
@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_FILL_HPP
|
|
#define BOOST_HANA_FILL_HPP
|
|
|
|
#include <boost/hana/fwd/fill.hpp>
|
|
|
|
#include <boost/hana/concept/functor.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/functional/always.hpp>
|
|
#include <boost/hana/transform.hpp>
|
|
#include <boost/hana/unpack.hpp>
|
|
|
|
|
|
BOOST_HANA_NAMESPACE_BEGIN
|
|
//! @cond
|
|
template <typename Xs, typename Value>
|
|
constexpr auto fill_t::operator()(Xs&& xs, Value&& value) const {
|
|
using S = typename hana::tag_of<Xs>::type;
|
|
using Fill = BOOST_HANA_DISPATCH_IF(fill_impl<S>,
|
|
hana::Functor<S>::value
|
|
);
|
|
|
|
#ifndef BOOST_HANA_CONFIG_DISABLE_CONCEPT_CHECKS
|
|
static_assert(hana::Functor<S>::value,
|
|
"hana::fill(xs, value) requires 'xs' to be a Functor");
|
|
#endif
|
|
|
|
return Fill::apply(static_cast<Xs&&>(xs),
|
|
static_cast<Value&&>(value));
|
|
}
|
|
//! @endcond
|
|
|
|
template <typename Fun, bool condition>
|
|
struct fill_impl<Fun, when<condition>> : default_ {
|
|
template <typename Xs, typename Value>
|
|
static constexpr auto apply(Xs&& xs, Value&& v) {
|
|
return hana::transform(static_cast<Xs&&>(xs),
|
|
hana::always(static_cast<Value&&>(v))
|
|
);
|
|
}
|
|
};
|
|
|
|
template <typename S>
|
|
struct fill_impl<S, when<Sequence<S>::value>> {
|
|
//! @cond
|
|
template <typename V>
|
|
struct filler {
|
|
V const& v;
|
|
template <typename ...Xs>
|
|
constexpr auto operator()(Xs const& ...xs) const {
|
|
return hana::make<S>(((void)xs, v)...);
|
|
}
|
|
};
|
|
//! @endcond
|
|
|
|
template <typename Xs, typename V>
|
|
static constexpr auto apply(Xs const& xs, V const& v) {
|
|
return hana::unpack(xs, filler<V>{v});
|
|
}
|
|
};
|
|
BOOST_HANA_NAMESPACE_END
|
|
|
|
#endif // !BOOST_HANA_FILL_HPP
|