mirror of
https://github.com/ecency/ecency-mobile.git
synced 2024-12-26 23:05:00 +03:00
76 lines
2.4 KiB
C++
76 lines
2.4 KiB
C++
|
/*!
|
||
|
|
@file
|
||
|
|
Defines `boost::hana::unique`.
|
||
|
|
|
||
|
|
@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_UNIQUE_HPP
|
||
|
|
#define BOOST_HANA_UNIQUE_HPP
|
||
|
|
|
||
|
|
#include <boost/hana/fwd/unique.hpp>
|
||
|
|
|
||
|
|
#include <boost/hana/concept/sequence.hpp>
|
||
|
|
#include <boost/hana/config.hpp>
|
||
|
|
#include <boost/hana/core/dispatch.hpp>
|
||
|
|
#include <boost/hana/detail/nested_by.hpp> // required by fwd decl
|
||
|
|
#include <boost/hana/equal.hpp>
|
||
|
|
#include <boost/hana/front.hpp>
|
||
|
|
#include <boost/hana/group.hpp>
|
||
|
|
#include <boost/hana/transform.hpp>
|
||
|
|
|
||
|
|
|
||
|
|
BOOST_HANA_NAMESPACE_BEGIN
|
||
|
|
//! @cond
|
||
|
|
template <typename Xs>
|
||
|
|
constexpr auto unique_t::operator()(Xs&& xs) const {
|
||
|
|
using S = typename hana::tag_of<Xs>::type;
|
||
|
|
using Unique = BOOST_HANA_DISPATCH_IF(unique_impl<S>,
|
||
|
|
hana::Sequence<S>::value
|
||
|
|
);
|
||
|
|
|
||
|
|
#ifndef BOOST_HANA_CONFIG_DISABLE_CONCEPT_CHECKS
|
||
|
|
static_assert(hana::Sequence<S>::value,
|
||
|
|
"hana::unique(xs) requires 'xs' to be a Sequence");
|
||
|
|
#endif
|
||
|
|
|
||
|
|
return Unique::apply(static_cast<Xs&&>(xs));
|
||
|
|
}
|
||
|
|
|
||
|
|
template <typename Xs, typename Predicate>
|
||
|
|
constexpr auto unique_t::operator()(Xs&& xs, Predicate&& predicate) const {
|
||
|
|
using S = typename hana::tag_of<Xs>::type;
|
||
|
|
using Unique = BOOST_HANA_DISPATCH_IF(unique_impl<S>,
|
||
|
|
hana::Sequence<S>::value
|
||
|
|
);
|
||
|
|
|
||
|
|
#ifndef BOOST_HANA_CONFIG_DISABLE_CONCEPT_CHECKS
|
||
|
|
static_assert(hana::Sequence<S>::value,
|
||
|
|
"hana::unique(xs, predicate) requires 'xs' to be a Sequence");
|
||
|
|
#endif
|
||
|
|
|
||
|
|
return Unique::apply(static_cast<Xs&&>(xs),
|
||
|
|
static_cast<Predicate&&>(predicate));
|
||
|
|
}
|
||
|
|
//! @endcond
|
||
|
|
|
||
|
|
template <typename S, bool condition>
|
||
|
|
struct unique_impl<S, when<condition>> : default_ {
|
||
|
|
template <typename Xs, typename Pred>
|
||
|
|
static constexpr auto apply(Xs&& xs, Pred&& pred) {
|
||
|
|
return hana::transform(
|
||
|
|
hana::group(static_cast<Xs&&>(xs), static_cast<Pred&&>(pred)),
|
||
|
|
hana::front
|
||
|
|
);
|
||
|
|
}
|
||
|
|
|
||
|
|
template <typename Xs>
|
||
|
|
static constexpr auto apply(Xs&& xs)
|
||
|
|
{ return unique_impl::apply(static_cast<Xs&&>(xs), hana::equal); }
|
||
|
|
};
|
||
|
|
BOOST_HANA_NAMESPACE_END
|
||
|
|
|
||
|
|
#endif // !BOOST_HANA_UNIQUE_HPP
|