text: /// \file
  // 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/disable_warnings.hpp>
  
  namespace ranges
  {
      /// \addtogroup group-views
      /// @{
      namespace views
      {
          struct remove_base_fn
          {
          private:
              template<typename Value>
              struct pred_
              {
                  Value value_;
                  template<typename T>
                  auto operator()(T && other) const -> CPP_ret(bool)( //
                      requires equality_comparable_with<T, Value const &>)
                  {
                      return static_cast<T &&>(other) == value_;
                  }
              };
  
          public:
              template<typename Rng, typename Value>
              constexpr auto CPP_fun(operator())(Rng && rng, Value value)(
                  const requires move_constructible<Value> && viewable_range<Rng> &&
                      input_range<Rng> &&
                          indirectly_comparable<iterator_t<Rng>, Value const *, equal_to>)
              {
                  return remove_if(static_cast<Rng &&>(rng),
                                   pred_<Value>{std::move(value)});
              }
  
              template<typename Rng, typename Value, typename Proj>
              constexpr auto CPP_fun(operator())(Rng && rng, Value value, Proj proj)(
                  const requires move_constructible<Value> && viewable_range<Rng> &&
                      input_range<Rng> && indirectly_comparable<
                          iterator_t<Rng>, Value const *, equal_to, Proj>)
              {
                  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>
              constexpr auto CPP_fun(operator())(Value && value,
                                                 Proj proj)(const //
                                                            requires(!range<Value>)) // TODO: underconstrained
              {
                  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();
          };
  
          /// \relates remove_fn
          /// \ingroup group-views
          RANGES_INLINE_VARIABLE(remove_fn, remove)
      } // namespace views
      /// @}
  } // namespace ranges
  
  #include <range/v3/detail/reenable_warnings.hpp>
  
  #endif // RANGES_V3_VIEW_REMOVE_HPP
  