mirror of https://github.com/axmolengine/axmol.git
128 lines
3.5 KiB
C++
128 lines
3.5 KiB
C++
/// \file
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// Range v3 library
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//
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// Copyright Eric Niebler 2014-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_COUNTED_HPP
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#define RANGES_V3_VIEW_COUNTED_HPP
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#include <utility>
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#include <range/v3/range_fwd.hpp>
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#include <range/v3/iterator/concepts.hpp>
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#include <range/v3/iterator/counted_iterator.hpp>
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#include <range/v3/iterator/default_sentinel.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/view/interface.hpp>
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#include <range/v3/view/subrange.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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template<typename I>
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struct counted_view : view_interface<counted_view<I>, finite>
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{
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private:
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friend range_access;
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I it_;
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iter_difference_t<I> n_;
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public:
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counted_view() = default;
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counted_view(I it, iter_difference_t<I> n)
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: it_(it)
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, n_(n)
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{
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RANGES_EXPECT(0 <= n_);
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}
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counted_iterator<I> begin() const
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{
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return make_counted_iterator(it_, n_);
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}
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default_sentinel_t end() const
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{
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return {};
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}
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auto size() const
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{
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return static_cast<detail::iter_size_t<I>>(n_);
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}
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};
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template<typename I>
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RANGES_INLINE_VAR constexpr bool enable_borrowed_range<counted_view<I>> = true;
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#if RANGES_CXX_DEDUCTION_GUIDES >= RANGES_CXX_DEDUCTION_GUIDES_17
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template<typename I>
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counted_view(I, iter_difference_t<I>)
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-> counted_view<I>;
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#endif
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namespace views
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{
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struct cpp20_counted_fn
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{
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template(typename I)(
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requires input_or_output_iterator<I> AND (!random_access_iterator<I>)) //
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subrange<counted_iterator<I>, default_sentinel_t> //
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operator()(I it, iter_difference_t<I> n) const
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{
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return {make_counted_iterator(std::move(it), n), default_sentinel};
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}
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template(typename I)(
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requires random_access_iterator<I>)
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subrange<I> operator()(I it, iter_difference_t<I> n) const
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{
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return {it, it + n};
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}
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};
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struct counted_fn
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{
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template(typename I)(
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requires input_or_output_iterator<I> AND (!random_access_iterator<I>)) //
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counted_view<I> operator()(I it, iter_difference_t<I> n) const
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{
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return {std::move(it), n};
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}
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template(typename I)(
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requires random_access_iterator<I>)
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subrange<I> operator()(I it, iter_difference_t<I> n) const
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{
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return {it, it + n};
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}
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};
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/// \relates counted_fn
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/// \ingroup group-views
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RANGES_INLINE_VARIABLE(counted_fn, counted)
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} // namespace views
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namespace cpp20
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{
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namespace views
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{
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RANGES_INLINE_VARIABLE(ranges::views::cpp20_counted_fn, counted)
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}
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} // namespace cpp20
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/// @}
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} // namespace ranges
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#include <range/v3/detail/epilogue.hpp>
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#include <range/v3/detail/satisfy_boost_range.hpp>
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RANGES_SATISFY_BOOST_RANGE(::ranges::counted_view)
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#endif
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