remove.hpp

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// Range v3 library
//
//  Copyright Andrey Diduh 2019
//
//  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_HPP
#define RANGES_V3_VIEW_REMOVE_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/functional/comparisons.hpp>
#include <range/v3/view/remove_if.hpp>
#include <range/v3/view/view.hpp>
 
#include <range/v3/detail/prologue.hpp>
 
namespace ranges
{
    namespace views
    {
        struct remove_base_fn
        {
        private:
            template<typename Value>
            struct pred_
            {
                Value value_;
                template(typename T)(
                    requires equality_comparable_with<T, Value const &>)
                bool operator()(T && other) const
                {
                    return static_cast<T &&>(other) == value_;
                }
            };
 
        public:
            template(typename Rng, typename Value)(
                requires move_constructible<Value> AND viewable_range<Rng> AND
                    input_range<Rng> AND
                    indirectly_comparable<iterator_t<Rng>, Value const *, equal_to>)
            constexpr auto operator()(Rng && rng, Value value) const
            {
                return remove_if(static_cast<Rng &&>(rng),
                                 pred_<Value>{std::move(value)});
            }
 
            template(typename Rng, typename Value, typename Proj)(
                requires move_constructible<Value> AND viewable_range<Rng> AND
                    input_range<Rng> AND
                    indirectly_comparable<iterator_t<Rng>, Value const *, equal_to, Proj>)
            constexpr auto operator()(Rng && rng, Value value, Proj proj) const
            {
                return remove_if(static_cast<Rng &&>(rng),
                                 pred_<Value>{std::move(value)},
                                 std::move(proj));
            }
        };
 
        struct remove_bind_fn
        {
            template<typename Value>
            constexpr auto operator()(Value value) const // TODO: underconstrained
            {
                return make_view_closure(bind_back(remove_base_fn{}, std::move(value)));
            }
            template(typename Value, typename Proj)(
                requires (!range<Value>)) // TODO: underconstrained
            constexpr auto operator()(Value && value, Proj proj) const
            {
                return make_view_closure(bind_back(
                    remove_base_fn{}, static_cast<Value &&>(value), std::move(proj)));
            }
        };
 
        struct RANGES_EMPTY_BASES remove_fn
          : remove_base_fn, remove_bind_fn
        {
            using remove_base_fn::operator();
            using remove_bind_fn::operator();
        };

        RANGES_INLINE_VARIABLE(remove_fn, remove)
    } // namespace views
} // namespace ranges
 
#include <range/v3/detail/epilogue.hpp>
 
#endif // RANGES_V3_VIEW_REMOVE_HPP