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Telegram/ThirdParty/range-v3/include/range/v3/view/remove_if.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_REMOVE_IF_HPP
+#define RANGES_V3_VIEW_REMOVE_IF_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/invoke.hpp>
+#include <range/v3/range/access.hpp>
+#include <range/v3/range/concepts.hpp>
+#include <range/v3/range/traits.hpp>
+#include <range/v3/utility/box.hpp>
+#include <range/v3/utility/optional.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 RANGES_EMPTY_BASES remove_if_view
+      : view_adaptor<remove_if_view<Rng, Pred>, Rng,
+                     is_finite<Rng>::value ? finite : range_cardinality<Rng>::value>
+      , private box<semiregular_box_t<Pred>>
+    {
+        remove_if_view() = default;
+        constexpr remove_if_view(Rng rng, Pred pred)
+          : remove_if_view::view_adaptor{detail::move(rng)}
+          , remove_if_view::box(detail::move(pred))
+        {}
+
+    private:
+        friend range_access;
+
+        struct adaptor : adaptor_base
+        {
+            adaptor() = default;
+            constexpr adaptor(remove_if_view * rng) noexcept
+              : rng_(rng)
+            {}
+            static constexpr iterator_t<Rng> begin(remove_if_view & rng)
+            {
+                return *rng.begin_;
+            }
+            constexpr void next(iterator_t<Rng> & it) const
+            {
+                RANGES_ASSERT(it != ranges::end(rng_->base()));
+                rng_->satisfy_forward(++it);
+            }
+            CPP_member
+            constexpr auto prev(iterator_t<Rng> & it) const //
+                -> CPP_ret(void)(
+                    requires bidirectional_range<Rng>)
+            {
+                rng_->satisfy_reverse(it);
+            }
+            void advance() = delete;
+            void distance_to() = delete;
+
+        private:
+            remove_if_view * rng_;
+        };
+        constexpr adaptor begin_adaptor()
+        {
+            cache_begin();
+            return {this};
+        }
+        CPP_member
+        constexpr auto end_adaptor() const noexcept //
+            -> CPP_ret(adaptor_base)(
+                requires (!common_range<Rng>))
+        {
+            return {};
+        }
+        CPP_member
+        constexpr auto end_adaptor() //
+            -> CPP_ret(adaptor)(
+                requires common_range<Rng>)
+        {
+            if(bidirectional_range<Rng>)
+                cache_begin();
+            return {this};
+        }
+
+        constexpr void satisfy_forward(iterator_t<Rng> & it)
+        {
+            auto const last = ranges::end(this->base());
+            auto & pred = this->remove_if_view::box::get();
+            while(it != last && invoke(pred, *it))
+                ++it;
+        }
+        constexpr void satisfy_reverse(iterator_t<Rng> & it)
+        {
+            RANGES_ASSERT(begin_);
+            auto const & first = *begin_;
+            auto & pred = this->remove_if_view::box::get();
+            do
+            {
+                RANGES_ASSERT(it != first);
+                (void)first;
+                --it;
+            } while(invoke(pred, *it));
+        }
+
+        constexpr void cache_begin()
+        {
+            if(begin_)
+                return;
+            auto it = ranges::begin(this->base());
+            satisfy_forward(it);
+            begin_.emplace(std::move(it));
+        }
+
+        detail::non_propagating_cache<iterator_t<Rng>> begin_;
+    };
+
+#if RANGES_CXX_DEDUCTION_GUIDES >= RANGES_CXX_DEDUCTION_GUIDES_17
+    template(typename Rng, typename Pred)(
+        requires copy_constructible<Pred>)
+    remove_if_view(Rng &&, Pred)
+        -> remove_if_view<views::all_t<Rng>, Pred>;
+#endif
+
+    namespace views
+    {
+        /// Given a source range, unary predicate, and optional projection,
+        /// present a view of the elements that do not satisfy the predicate.
+        struct remove_if_base_fn
+        {
+            template(typename Rng, typename Pred)(
+                requires viewable_range<Rng> AND input_range<Rng> AND
+                    indirect_unary_predicate<Pred, iterator_t<Rng>>)
+            constexpr remove_if_view<all_t<Rng>, Pred> operator()(Rng && rng, Pred pred)
+                const
+            {
+                return remove_if_view<all_t<Rng>, Pred>{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<Pred, projected<iterator_t<Rng>, Proj>>)
+            constexpr remove_if_view<all_t<Rng>, composed<Pred, Proj>> //
+            operator()(Rng && rng, Pred pred, Proj proj) const
+            {
+                return remove_if_view<all_t<Rng>, composed<Pred, Proj>>{
+                    all(static_cast<Rng &&>(rng)),
+                    compose(std::move(pred), std::move(proj))};
+            }
+        };
+
+        struct remove_if_bind_fn
+        {
+            template<typename Pred>
+            constexpr auto operator()(Pred pred) const // TODO: underconstrained
+            {
+                return make_view_closure(bind_back(remove_if_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(
+                    remove_if_base_fn{}, static_cast<Pred &&>(pred), std::move(proj)));
+            }
+        };
+
+        struct RANGES_EMPTY_BASES remove_if_fn
+          : remove_if_base_fn, remove_if_bind_fn
+        {
+            using remove_if_base_fn::operator();
+            using remove_if_bind_fn::operator();
+        };
+
+        /// \relates remove_if_fn
+        /// \ingroup group-views
+        RANGES_INLINE_VARIABLE(remove_if_fn, remove_if)
+    } // namespace views
+    /// @}
+} // namespace ranges
+
+#include <range/v3/detail/satisfy_boost_range.hpp>
+RANGES_SATISFY_BOOST_RANGE(::ranges::remove_if_view)
+
+#include <range/v3/detail/epilogue.hpp>
+
+#endif