mirror of https://github.com/axmolengine/axmol.git
133 lines
4.1 KiB
C++
133 lines
4.1 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_VIEW_DELIMIT_HPP
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#define RANGES_V3_VIEW_DELIMIT_HPP
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#include <meta/meta.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/iterator/concepts.hpp>
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#include <range/v3/iterator/unreachable_sentinel.hpp>
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#include <range/v3/range/concepts.hpp>
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#include <range/v3/utility/static_const.hpp>
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#include <range/v3/view/adaptor.hpp>
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#include <range/v3/view/all.hpp>
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#include <range/v3/view/subrange.hpp>
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#include <range/v3/view/view.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 Rng, typename Val>
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struct delimit_view
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: view_adaptor<delimit_view<Rng, Val>, Rng,
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is_finite<Rng>::value ? finite : unknown>
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{
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private:
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friend range_access;
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Val value_;
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struct sentinel_adaptor : adaptor_base
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{
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sentinel_adaptor() = default;
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sentinel_adaptor(Val value)
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: value_(std::move(value))
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{}
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template<class I, class S>
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bool empty(I const & it, S const & last) const
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{
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return it == last || *it == value_;
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}
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Val value_;
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};
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sentinel_adaptor end_adaptor() const
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{
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return {value_};
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}
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public:
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delimit_view() = default;
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constexpr delimit_view(Rng rng, Val value)
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: delimit_view::view_adaptor{std::move(rng)}
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, value_(std::move(value))
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{}
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};
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// the begin iterator will be an iterator into the underlying view (conditionally
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// borrowed) and the end iterator owns the value to be compared against (borrowed)
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template<typename Rng, typename Val>
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RANGES_INLINE_VAR constexpr bool enable_borrowed_range<delimit_view<Rng, Val>> = //
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enable_borrowed_range<Rng>;
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#if RANGES_CXX_DEDUCTION_GUIDES >= RANGES_CXX_DEDUCTION_GUIDES_17
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template(typename Rng, typename Val)(
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requires copy_constructible<Val>)
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delimit_view(Rng &&, Val)
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-> delimit_view<views::all_t<Rng>, Val>;
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#endif
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namespace views
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{
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struct delimit_base_fn
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{
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template(typename I_, typename Val, typename I = detail::decay_t<I_>)(
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requires (!range<I_>) AND convertible_to<I_, I> AND input_iterator<I> AND
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semiregular<Val> AND
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equality_comparable_with<Val, iter_reference_t<I>>)
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constexpr auto operator()(I_ && begin_, Val value) const
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-> delimit_view<subrange<I, unreachable_sentinel_t>, Val>
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{
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return {{static_cast<I_ &&>(begin_), {}}, std::move(value)};
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}
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template(typename Rng, typename Val)(
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requires viewable_range<Rng> AND input_range<Rng> AND semiregular<
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Val> AND equality_comparable_with<Val, range_reference_t<Rng>>)
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constexpr auto operator()(Rng && rng, Val value) const //
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-> delimit_view<all_t<Rng>, Val>
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{
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return {all(static_cast<Rng &&>(rng)), std::move(value)};
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}
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};
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struct delimit_fn : delimit_base_fn
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{
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using delimit_base_fn::operator();
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template<typename Val>
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constexpr auto operator()(Val value) const
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{
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return make_view_closure(bind_back(delimit_base_fn{}, std::move(value)));
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}
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};
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/// \relates delimit_fn
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/// \ingroup group-views
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RANGES_INLINE_VARIABLE(delimit_fn, delimit)
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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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#include <range/v3/detail/satisfy_boost_range.hpp>
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RANGES_SATISFY_BOOST_RANGE(::ranges::delimit_view)
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#endif
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