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