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67 lines
1.7 KiB
C++
67 lines
1.7 KiB
C++
/// \file
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// Range v3 library
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//
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// Copyright Barry Revzin 2019-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_VIEW_TAKE_LAST_HPP
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#define RANGES_V3_VIEW_TAKE_LAST_HPP
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#include <concepts/concepts.hpp>
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#include <range/v3/range_fwd.hpp>
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#include <range/v3/functional/bind_back.hpp>
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#include <range/v3/range/concepts.hpp>
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#include <range/v3/range/operations.hpp>
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#include <range/v3/view/drop_exactly.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-views
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/// @{
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namespace views
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{
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struct take_last_base_fn
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{
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template(typename Rng)(
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requires viewable_range<Rng> AND sized_range<Rng>)
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auto operator()(Rng && rng, range_difference_t<Rng> n) const
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{
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auto sz = ranges::distance(rng);
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return drop_exactly(static_cast<Rng &&>(rng), sz > n ? sz - n : 0);
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}
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};
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struct take_last_fn : take_last_base_fn
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{
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using take_last_base_fn::operator();
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template(typename Int)(
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requires detail::integer_like_<Int>)
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constexpr auto operator()(Int n) const
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{
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return make_view_closure(bind_back(take_last_base_fn{}, n));
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}
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};
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/// \relates take_last_fn
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RANGES_INLINE_VARIABLE(take_last_fn, take_last)
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} // namespace views
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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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