mirror of https://github.com/axmolengine/axmol.git
80 lines
2.4 KiB
C++
80 lines
2.4 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_STRIDE_HPP
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#define RANGES_V3_ACTION_STRIDE_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/functional/bind_back.hpp>
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#include <range/v3/iterator/concepts.hpp>
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#include <range/v3/iterator/operations.hpp>
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#include <range/v3/iterator/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 stride_fn
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{
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template(typename D)(
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requires detail::integer_like_<D>)
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constexpr auto operator()(D step) const
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{
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return make_action_closure(bind_back(stride_fn{}, step));
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}
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template(typename Rng, typename D = range_difference_t<Rng>)(
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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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permutable<iterator_t<Rng>>)
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Rng operator()(Rng && rng, range_difference_t<Rng> const step) const
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{
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using I = iterator_t<Rng>;
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using S = sentinel_t<Rng>;
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RANGES_EXPECT(0 < step);
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if(1 < step)
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{
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I first = ranges::begin(rng);
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S const last = ranges::end(rng);
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if(first != last)
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{
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for(I i = ranges::next(++first, step - 1, last); i != last;
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advance(i, step, last), ++first)
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{
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*first = iter_move(i);
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}
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}
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ranges::actions::erase(rng, first, last);
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}
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return static_cast<Rng &&>(rng);
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}
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};
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/// \relates actions::stride_fn
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RANGES_INLINE_VARIABLE(stride_fn, stride)
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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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