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69 lines
2.1 KiB
C++
69 lines
2.1 KiB
C++
/// \file
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// Range v3 library
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//
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// Copyright Eric Niebler 2013-present
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//
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// Use, modification and distribution is subject to the
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// Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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//
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// Project home: https://github.com/ericniebler/range-v3
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//
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#ifndef RANGES_V3_ACTION_UNIQUE_HPP
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#define RANGES_V3_ACTION_UNIQUE_HPP
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#include <range/v3/range_fwd.hpp>
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#include <range/v3/action/action.hpp>
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#include <range/v3/action/erase.hpp>
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#include <range/v3/algorithm/unique.hpp>
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#include <range/v3/functional/bind_back.hpp>
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#include <range/v3/functional/comparisons.hpp>
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#include <range/v3/functional/identity.hpp>
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#include <range/v3/iterator/concepts.hpp>
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#include <range/v3/range/traits.hpp>
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#include <range/v3/utility/static_const.hpp>
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#include <range/v3/detail/prologue.hpp>
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namespace ranges
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{
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/// \addtogroup group-actions
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/// @{
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namespace actions
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{
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struct unique_fn
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{
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template(typename C, typename P = identity)(
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requires (!range<C>))
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constexpr auto operator()(C pred, P proj = P{}) const
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{
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return make_action_closure(
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bind_back(unique_fn{}, std::move(pred), std::move(proj)));
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}
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template(typename Rng, typename C = equal_to, typename P = identity)(
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requires forward_range<Rng> AND
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erasable_range<Rng &, iterator_t<Rng>, sentinel_t<Rng>> AND
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sortable<iterator_t<Rng>, C, P>)
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Rng operator()(Rng && rng, C pred = C{}, P proj = P{}) const
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{
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auto it = ranges::unique(rng, std::move(pred), std::move(proj));
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ranges::erase(rng, it, end(rng));
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return static_cast<Rng &&>(rng);
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}
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};
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/// \relates detail::unique_fn
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/// \sa action_closure
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RANGES_INLINE_VARIABLE(action_closure<unique_fn>, unique)
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} // namespace actions
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/// @}
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} // namespace ranges
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#include <range/v3/detail/epilogue.hpp>
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#endif
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