text: /// \file
  // Range v3 library
  //
  //  Copyright Eric Niebler 2014
  //
  //  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_ALGORITHM_REMOVE_COPY_IF_HPP
  #define RANGES_V3_ALGORITHM_REMOVE_COPY_IF_HPP
  
  #include <range/v3/range_fwd.hpp>
  #include <range/v3/begin_end.hpp>
  #include <range/v3/range_concepts.hpp>
  #include <range/v3/range_traits.hpp>
  #include <range/v3/utility/iterator_concepts.hpp>
  #include <range/v3/utility/iterator_traits.hpp>
  #include <range/v3/utility/functional.hpp>
  #include <range/v3/utility/invokable.hpp>
  
  namespace ranges
  {
      inline namespace v3
      {
          /// \ingroup group-concepts
          template<typename I, typename O, typename C, typename P = ident,
              typename V = iterator_common_reference_t<I>,
              typename X = concepts::Invokable::result_t<P, V>>
          using RemoveCopyableIf = meta::fast_and<
              InputIterator<I>,
              WeaklyIncrementable<O>,
              InvokablePredicate<C, X>,
              IndirectlyCopyable<I, O, P>>;
  
          /// \addtogroup group-algorithms
          /// @{
          struct remove_copy_if_fn
          {
              template<typename I, typename S, typename O, typename C, typename P = ident,
                  CONCEPT_REQUIRES_(RemoveCopyableIf<I, O, C, P>() && IteratorRange<I, S>())>
              std::pair<I, O> operator()(I begin, S end, O out, C pred_, P proj_ = P{}) const
              {
                  auto &&pred = invokable(pred_);
                  auto &&proj = invokable(proj_);
                  for(; begin != end; ++begin)
                  {
                      auto &&x = *begin;
                      auto &&v = proj((decltype(x) &&) x);
                      if(!(pred(v)))
                      {
                          *out = (decltype(v) &&) v;
                          ++out;
                      }
                  }
                  return {begin, out};
              }
  
              template<typename Rng, typename O, typename C, typename P = ident,
                  typename I = range_iterator_t<Rng>,
                  CONCEPT_REQUIRES_(RemoveCopyableIf<I, O, C, P>() && InputIterable<Rng &>())>
              std::pair<I, O> operator()(Rng &rng, O out, C pred, P proj = P{}) const
              {
                  return (*this)(begin(rng), end(rng), std::move(out), std::move(pred), std::move(proj));
              }
          };
  
          /// \sa `remove_copy_if_fn`
          /// \ingroup group-algorithms
          constexpr remove_copy_if_fn remove_copy_if{};
  
          /// @}
      } // namespace v3
  } // namespace ranges
  
  #endif // include guard
  