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/*!
@file
Defines `boost::hana::unique`.
@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_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
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