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Telegram/ThirdParty/range-v3/include/range/v3/view/take_while.hpp

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+/// \file
+// Range v3 library
+//
+//  Copyright Eric Niebler 2013-present
+//
+//  Use, modification and distribution is subject to the
+//  Boost Software License, Version 1.0. (See accompanying
+//  file LICENSE_1_0.txt or copy at
+//  http://www.boost.org/LICENSE_1_0.txt)
+//
+// Project home: https://github.com/ericniebler/range-v3
+//
+
+#ifndef RANGES_V3_VIEW_TAKE_WHILE_HPP
+#define RANGES_V3_VIEW_TAKE_WHILE_HPP
+
+#include <type_traits>
+#include <utility>
+
+#include <meta/meta.hpp>
+
+#include <range/v3/range_fwd.hpp>
+
+#include <range/v3/functional/bind_back.hpp>
+#include <range/v3/functional/compose.hpp>
+#include <range/v3/functional/indirect.hpp>
+#include <range/v3/functional/invoke.hpp>
+#include <range/v3/iterator/concepts.hpp>
+#include <range/v3/range/concepts.hpp>
+#include <range/v3/utility/semiregular_box.hpp>
+#include <range/v3/utility/static_const.hpp>
+#include <range/v3/view/adaptor.hpp>
+#include <range/v3/view/view.hpp>
+
+#include <range/v3/detail/prologue.hpp>
+
+namespace ranges
+{
+    /// \addtogroup group-views
+    /// @{
+    template<typename Rng, typename Pred>
+    struct iter_take_while_view
+      : view_adaptor<iter_take_while_view<Rng, Pred>, Rng,
+                     is_finite<Rng>::value ? finite : unknown>
+    {
+    private:
+        friend range_access;
+        RANGES_NO_UNIQUE_ADDRESS semiregular_box_t<Pred> pred_;
+
+        template<bool IsConst>
+        struct sentinel_adaptor : adaptor_base
+        {
+        private:
+            friend struct sentinel_adaptor<!IsConst>;
+            using CRng = meta::const_if_c<IsConst, Rng>;
+            RANGES_NO_UNIQUE_ADDRESS semiregular_box_ref_or_val_t<Pred, IsConst> pred_;
+
+        public:
+            sentinel_adaptor() = default;
+            sentinel_adaptor(semiregular_box_ref_or_val_t<Pred, IsConst> pred)
+              : pred_(std::move(pred))
+            {}
+            template(bool Other)(
+                requires IsConst AND CPP_NOT(Other)) //
+                sentinel_adaptor(sentinel_adaptor<Other> that)
+              : pred_(std::move(that.pred_))
+            {}
+            bool empty(iterator_t<CRng> const & it, sentinel_t<CRng> const & last) const
+            {
+                return it == last || !invoke(pred_, it);
+            }
+        };
+        sentinel_adaptor<false> end_adaptor()
+        {
+            return {pred_};
+        }
+        template(bool Const = true)(
+            requires Const AND range<meta::const_if_c<Const, Rng>> AND
+                invocable<Pred const &, iterator_t<meta::const_if_c<Const, Rng>>>)
+        sentinel_adaptor<Const> end_adaptor() const
+        {
+            return {pred_};
+        }
+
+    public:
+        iter_take_while_view() = default;
+        constexpr iter_take_while_view(Rng rng, Pred pred)
+          : iter_take_while_view::view_adaptor{std::move(rng)}
+          , pred_(std::move(pred))
+        {}
+    };
+
+    template<typename Rng, typename Pred>
+    struct take_while_view : iter_take_while_view<Rng, indirected<Pred>>
+    {
+        take_while_view() = default;
+        constexpr take_while_view(Rng rng, Pred pred)
+          : iter_take_while_view<Rng, indirected<Pred>>{std::move(rng),
+                                                        indirect(std::move(pred))}
+        {}
+    };
+
+#if RANGES_CXX_DEDUCTION_GUIDES >= RANGES_CXX_DEDUCTION_GUIDES_17
+    template(typename Rng, typename Fun)(
+        requires copy_constructible<Fun>)
+    take_while_view(Rng &&, Fun)
+        -> take_while_view<views::all_t<Rng>, Fun>;
+#endif
+
+    namespace views
+    {
+        struct iter_take_while_base_fn
+        {
+            template(typename Rng, typename Pred)(
+                requires viewable_range<Rng> AND input_range<Rng> AND
+                    predicate<Pred &, iterator_t<Rng>> AND copy_constructible<Pred>)
+            constexpr iter_take_while_view<all_t<Rng>, Pred> //
+            operator()(Rng && rng, Pred pred) const
+            {
+                return {all(static_cast<Rng &&>(rng)), std::move(pred)};
+            }
+        };
+
+        struct iter_take_while_fn : iter_take_while_base_fn
+        {
+            using iter_take_while_base_fn::operator();
+
+            template<typename Pred>
+            constexpr auto operator()(Pred pred) const
+            {
+                return make_view_closure(
+                    bind_back(iter_take_while_base_fn{}, std::move(pred)));
+            }
+        };
+
+        struct take_while_base_fn
+        {
+            template(typename Rng, typename Pred)(
+                requires viewable_range<Rng> AND input_range<Rng> AND
+                    indirect_unary_predicate<Pred &, iterator_t<Rng>>)
+            constexpr take_while_view<all_t<Rng>, Pred> //
+            operator()(Rng && rng, Pred pred) const
+            {
+                return {all(static_cast<Rng &&>(rng)), std::move(pred)};
+            }
+            template(typename Rng, typename Pred, typename Proj)(
+                requires viewable_range<Rng> AND input_range<Rng> AND
+                    indirect_unary_predicate<composed<Pred, Proj> &, iterator_t<Rng>>)
+            constexpr take_while_view<all_t<Rng>, composed<Pred, Proj>> //
+            operator()(Rng && rng, Pred pred, Proj proj) const
+            {
+                return {all(static_cast<Rng &&>(rng)),
+                        compose(std::move(pred), std::move(proj))};
+            }
+        };
+
+        struct take_while_bind_fn
+        {
+            template<typename Pred>
+            constexpr auto operator()(Pred pred) const // TODO: underconstrained
+            {
+                return make_view_closure(
+                    bind_back(take_while_base_fn{}, std::move(pred)));
+            }
+            template(typename Pred, typename Proj)(
+                requires (!range<Pred>)) // TODO: underconstrained
+            constexpr auto operator()(Pred && pred, Proj proj) const
+                                                          
+            {
+                return make_view_closure(bind_back(
+                    take_while_base_fn{}, static_cast<Pred &&>(pred), std::move(proj)));
+            }
+        };
+
+        struct RANGES_EMPTY_BASES take_while_fn
+          : take_while_base_fn, take_while_bind_fn
+        {
+            using take_while_base_fn::operator();
+            using take_while_bind_fn::operator();
+        };
+
+        /// \relates iter_take_while_fn
+        /// \ingroup group-views
+        RANGES_INLINE_VARIABLE(iter_take_while_fn, iter_take_while)
+
+        /// \relates take_while_fn
+        /// \ingroup group-views
+        RANGES_INLINE_VARIABLE(take_while_fn, take_while)
+    } // namespace views
+
+    namespace cpp20
+    {
+        namespace views
+        {
+            using ranges::views::take_while;
+        }
+        template(typename Rng, typename Pred)(
+            requires viewable_range<Rng> AND input_range<Rng> AND
+                predicate<Pred &, iterator_t<Rng>> AND copy_constructible<Pred>)
+            using take_while_view = ranges::take_while_view<Rng, Pred>;
+    } // namespace cpp20
+    /// @}
+} // namespace ranges
+
+#include <range/v3/detail/epilogue.hpp>
+#include <range/v3/detail/satisfy_boost_range.hpp>
+RANGES_SATISFY_BOOST_RANGE(::ranges::iter_take_while_view)
+RANGES_SATISFY_BOOST_RANGE(::ranges::take_while_view)
+
+#endif