75 lines
2.5 KiB
C++
75 lines
2.5 KiB
C++
/// \file
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// Range v3 library
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//
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// Copyright Eric Niebler 2014
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//
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// Use, modification and distribution is subject to the
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// Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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//
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// Project home: https://github.com/ericniebler/range-v3
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//
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#ifndef RANGES_V3_ALGORITHM_COPY_IF_HPP
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#define RANGES_V3_ALGORITHM_COPY_IF_HPP
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#include <utility>
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#include <functional>
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#include <range/v3/range_fwd.hpp>
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#include <range/v3/begin_end.hpp>
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#include <range/v3/range_traits.hpp>
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#include <range/v3/range_concepts.hpp>
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#include <range/v3/utility/functional.hpp>
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#include <range/v3/utility/iterator_traits.hpp>
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#include <range/v3/utility/iterator_concepts.hpp>
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#include <range/v3/utility/static_const.hpp>
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#include <range/v3/utility/tagged_pair.hpp>
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#include <range/v3/algorithm/tagspec.hpp>
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namespace ranges
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{
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inline namespace v3
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{
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/// \addtogroup group-algorithms
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/// @{
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struct copy_if_fn
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{
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template<typename I, typename S, typename O, typename F, typename P = ident,
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CONCEPT_REQUIRES_(InputIterator<I>() && Sentinel<S, I>() &&
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WeaklyIncrementable<O>() && IndirectPredicate<F, projected<I, P> >() &&
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IndirectlyCopyable<I, O>())>
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tagged_pair<tag::in(I), tag::out(O)>
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operator()(I begin, S end, O out, F pred, P proj = P{}) const
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{
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for(; begin != end; ++begin)
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{
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auto &&x = *begin;
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if(invoke(pred, invoke(proj, x)))
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{
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*out = (decltype(x) &&) x;
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++out;
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}
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}
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return {begin, out};
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}
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template<typename Rng, typename O, typename F, typename P = ident,
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typename I = iterator_t<Rng>,
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CONCEPT_REQUIRES_(InputRange<Rng>() && WeaklyIncrementable<O>() &&
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IndirectPredicate<F, projected<I, P> >() && IndirectlyCopyable<I, O>())>
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tagged_pair<tag::in(safe_iterator_t<Rng>), tag::out(O)>
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operator()(Rng &&rng, O out, F pred, P proj = P{}) const
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{
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return (*this)(begin(rng), end(rng), std::move(out), std::move(pred), std::move(proj));
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}
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};
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/// \sa `copy_if_fn`
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/// \ingroup group-algorithms
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RANGES_INLINE_VARIABLE(with_braced_init_args<copy_if_fn>, copy_if)
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/// @}
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} // namespace v3
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} // namespace ranges
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#endif // include guard
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