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Telegram/ThirdParty/range-v3/include/range/v3/view/replace.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_REPLACE_HPP
+#define RANGES_V3_VIEW_REPLACE_HPP
+
+#include <type_traits>
+#include <utility>
+
+#include <meta/meta.hpp>
+
+#include <concepts/concepts.hpp>
+
+#include <range/v3/range_fwd.hpp>
+
+#include <range/v3/functional/bind_back.hpp>
+#include <range/v3/utility/static_const.hpp>
+#include <range/v3/view/all.hpp>
+#include <range/v3/view/transform.hpp>
+#include <range/v3/view/view.hpp>
+
+#include <range/v3/detail/prologue.hpp>
+
+namespace ranges
+{
+    /// \cond
+    namespace detail
+    {
+        template<typename Val1, typename Val2>
+        struct replacer_fn
+        {
+        private:
+            Val1 old_value_;
+            Val2 new_value_;
+
+        public:
+            replacer_fn() = default;
+            constexpr replacer_fn(Val1 old_value, Val2 new_value)
+              : old_value_(std::move(old_value))
+              , new_value_(std::move(new_value))
+            {}
+
+            template<typename I>
+            [[noreturn]] common_type_t<decay_t<unwrap_reference_t<Val2 const &>>,
+                                       iter_value_t<I>> &
+            operator()(copy_tag, I const &) const
+            {
+                RANGES_EXPECT(false);
+            }
+
+            template<typename I>
+            common_reference_t<unwrap_reference_t<Val2 const &>, iter_reference_t<I>>
+            operator()(I const & i) const
+            {
+                auto && x = *i;
+                if(x == unwrap_reference(old_value_))
+                    return unwrap_reference(new_value_);
+                return ((decltype(x) &&)x);
+            }
+
+            template<typename I>
+            common_reference_t<unwrap_reference_t<Val2 const &>,
+                               iter_rvalue_reference_t<I>>
+            operator()(move_tag, I const & i) const
+            {
+                auto && x = iter_move(i);
+                if(x == unwrap_reference(old_value_))
+                    return unwrap_reference(new_value_);
+                return ((decltype(x) &&)x);
+            }
+        };
+    } // namespace detail
+    /// \endcond
+
+    /// \addtogroup group-views
+    /// @{
+    namespace views
+    {
+        struct replace_base_fn
+        {
+            template(typename Rng, typename Val1, typename Val2)(
+                requires viewable_range<Rng> AND input_range<Rng> AND
+                    same_as<
+                        detail::decay_t<unwrap_reference_t<Val1>>,
+                        detail::decay_t<unwrap_reference_t<Val2>>> AND
+                    equality_comparable_with<
+                        detail::decay_t<unwrap_reference_t<Val1>>,
+                        range_value_t<Rng>> AND
+                    common_with<detail::decay_t<unwrap_reference_t<Val2 const &>>,
+                                range_value_t<Rng>> AND
+                    common_reference_with<unwrap_reference_t<Val2 const &>,
+                                            range_reference_t<Rng>> AND
+                    common_reference_with<
+                        unwrap_reference_t<Val2 const &>,
+                        range_rvalue_reference_t<Rng>>)
+            constexpr replace_view< //
+                all_t<Rng>, //
+                detail::decay_t<Val1>, //
+                detail::decay_t<Val2>> //
+            operator()(Rng && rng, Val1 && old_value,
+                                      Val2 && new_value) const //
+            {
+                return {
+                    all(static_cast<Rng &&>(rng)),
+                    {static_cast<Val1 &&>(old_value), static_cast<Val2 &&>(new_value)}};
+            }
+        };
+
+        struct replace_fn : replace_base_fn
+        {
+            using replace_base_fn::operator();
+
+            template(typename Val1, typename Val2)(
+                requires same_as<detail::decay_t<unwrap_reference_t<Val1>>,
+                                 detail::decay_t<unwrap_reference_t<Val2>>>)
+            constexpr auto operator()(Val1 old_value, Val2 new_value) const
+            {
+                return make_view_closure(bind_back(
+                    replace_base_fn{}, std::move(old_value), std::move(new_value)));
+            }
+        };
+
+        /// \relates replace_fn
+        /// \ingroup group-views
+        RANGES_INLINE_VARIABLE(replace_fn, replace)
+    } // namespace views
+    /// @}
+} // namespace ranges
+
+#include <range/v3/detail/epilogue.hpp>
+
+#endif