mirror of https://github.com/axmolengine/axmol.git
143 lines
4.0 KiB
C++
143 lines
4.0 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_CONST_HPP
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#define RANGES_V3_VIEW_CONST_HPP
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#include <type_traits>
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#include <utility>
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#include <range/v3/range_fwd.hpp>
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#include <range/v3/range/access.hpp>
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#include <range/v3/range/concepts.hpp>
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#include <range/v3/range/primitives.hpp>
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#include <range/v3/utility/common_type.hpp>
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#include <range/v3/utility/move.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/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>
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struct const_view : view_adaptor<const_view<Rng>, Rng>
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{
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private:
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friend range_access;
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template<bool Const>
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struct adaptor : adaptor_base
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{
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using CRng = meta::const_if_c<Const, Rng>;
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using value_ = range_value_t<CRng>;
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using reference_ =
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common_reference_t<value_ const &&, range_reference_t<CRng>>;
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using rvalue_reference_ =
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common_reference_t<value_ const &&, range_rvalue_reference_t<CRng>>;
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adaptor() = default;
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template(bool Other)(
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requires Const && CPP_NOT(Other)) //
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constexpr adaptor(adaptor<Other>)
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{}
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reference_ read(iterator_t<CRng> const & it) const
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{
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return *it;
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}
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rvalue_reference_ iter_move(iterator_t<CRng> const & it) const
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noexcept(noexcept(rvalue_reference_(ranges::iter_move(it))))
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{
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return ranges::iter_move(it);
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}
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};
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adaptor<simple_view<Rng>()> begin_adaptor()
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{
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return {};
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}
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CPP_member
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auto begin_adaptor() const //
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-> CPP_ret(adaptor<true>)(
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requires range<Rng const>)
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{
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return {};
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}
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adaptor<simple_view<Rng>()> end_adaptor()
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{
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return {};
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}
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CPP_member
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auto end_adaptor() const //
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-> CPP_ret(adaptor<true>)(
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requires range<Rng const>)
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{
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return {};
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}
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public:
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const_view() = default;
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explicit const_view(Rng rng)
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: const_view::view_adaptor{std::move(rng)}
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{}
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CPP_auto_member
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constexpr auto CPP_fun(size)()(
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requires sized_range<Rng>)
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{
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return ranges::size(this->base());
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}
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CPP_auto_member
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constexpr auto CPP_fun(size)()(const
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requires sized_range<Rng const>)
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{
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return ranges::size(this->base());
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}
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};
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template<typename Rng>
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RANGES_INLINE_VAR constexpr bool enable_borrowed_range<const_view<Rng>> = //
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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>
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const_view(Rng &&) //
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-> const_view<views::all_t<Rng>>;
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#endif
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namespace views
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{
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struct const_fn
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{
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template(typename Rng)(
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requires viewable_range<Rng> AND input_range<Rng>)
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const_view<all_t<Rng>> operator()(Rng && rng) const
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{
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return const_view<all_t<Rng>>{all(static_cast<Rng &&>(rng))};
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}
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};
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/// \relates const_fn
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/// \ingroup group-views
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RANGES_INLINE_VARIABLE(view_closure<const_fn>, const_)
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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::const_view)
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#endif
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