v3/algorithm/remove_if.hpp

0001 /// \file
0002 // Range v3 library
0003 //
0004 //  Copyright Eric Niebler 2014-present
0005 //
0006 //  Use, modification and distribution is subject to the
0007 //  Boost Software License, Version 1.0. (See accompanying
0008 //  file LICENSE_1_0.txt or copy at
0009 //  http://www.boost.org/LICENSE_1_0.txt)
0010 //
0011 // Project home: https://github.com/ericniebler/range-v3
0012 //
0013 #ifndef RANGES_V3_ALGORITHM_REMOVE_IF_HPP
0014 #define RANGES_V3_ALGORITHM_REMOVE_IF_HPP
0015
0016 #include <meta/meta.hpp>
0017
0018 #include <range/v3/range_fwd.hpp>
0019
0020 #include <range/v3/algorithm/find_if.hpp>
0021 #include <range/v3/functional/identity.hpp>
0022 #include <range/v3/functional/invoke.hpp>
0023 #include <range/v3/iterator/concepts.hpp>
0024 #include <range/v3/iterator/operations.hpp>
0025 #include <range/v3/iterator/traits.hpp>
0026 #include <range/v3/range/access.hpp>
0027 #include <range/v3/range/concepts.hpp>
0028 #include <range/v3/range/dangling.hpp>
0029 #include <range/v3/range/traits.hpp>
0030 #include <range/v3/utility/static_const.hpp>
0031
0032 #include <range/v3/detail/prologue.hpp>
0033
0034 namespace ranges
0035 {
0036     /// \addtogroup group-algorithms
0037     /// @{
0038     RANGES_FUNC_BEGIN(remove_if)
0039
0040         /// \brief function template \c remove_if
0041         template(typename I, typename S, typename C, typename P = identity)(
0042             requires permutable<I> AND sentinel_for<S, I> AND
0043             indirect_unary_predicate<C, projected<I, P>>)
0044         constexpr I RANGES_FUNC(remove_if)(I first, S last, C pred, P proj = P{})
0045         {
0046             first = find_if(std::move(first), last, ranges::ref(pred), ranges::ref(proj));
0047             if(first != last)
0048             {
0049                 for(I i = next(first); i != last; ++i)
0050                 {
0051                     if(!(invoke(pred, invoke(proj, *i))))
0052                     {
0053                         *first = iter_move(i);
0054                         ++first;
0055                     }
0056                 }
0057             }
0058             return first;
0059         }
0060
0061         /// \overload
0062         template(typename Rng, typename C, typename P = identity)(
0063             requires forward_range<Rng> AND permutable<iterator_t<Rng>> AND
0064             indirect_unary_predicate<C, projected<iterator_t<Rng>, P>>)
0065         constexpr borrowed_iterator_t<Rng> RANGES_FUNC(remove_if)(Rng && rng, C pred, P proj = P{})
0066         {
0067             return (*this)(begin(rng), end(rng), std::move(pred), std::move(proj));
0068         }
0069
0070     RANGES_FUNC_END(remove_if)
0071
0072     namespace cpp20
0073     {
0074         using ranges::remove_if;
0075     }
0076     /// @}
0077 } // namespace ranges
0078
0079 #include <range/v3/detail/epilogue.hpp>
0080
0081 #endif