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91 lines
3.1 KiB
C++
91 lines
3.1 KiB
C++
/// \file
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// Range v3 library
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//
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// Copyright Eric Niebler 2013-present
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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_ACTION_SPLIT_WHEN_HPP
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#define RANGES_V3_ACTION_SPLIT_WHEN_HPP
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#include <vector>
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#include <meta/meta.hpp>
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#include <range/v3/range_fwd.hpp>
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#include <range/v3/action/action.hpp>
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#include <range/v3/action/concepts.hpp>
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#include <range/v3/functional/bind_back.hpp>
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#include <range/v3/functional/invoke.hpp>
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#include <range/v3/iterator/concepts.hpp>
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#include <range/v3/iterator/traits.hpp>
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#include <range/v3/range/conversion.hpp>
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#include <range/v3/utility/static_const.hpp>
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#include <range/v3/view/split_when.hpp>
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#include <range/v3/detail/prologue.hpp>
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namespace ranges
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{
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/// \addtogroup group-actions
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/// @{
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namespace actions
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{
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struct split_when_fn
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{
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template<typename Rng>
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using split_value_t =
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meta::if_c<(bool)ranges::container<Rng>, //
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uncvref_t<Rng>, std::vector<range_value_t<Rng>>>;
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template<typename Fun>
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constexpr auto operator()(Fun fun) const
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{
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return make_action_closure(
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bind_back(split_when_fn{}, static_cast<Fun &&>(fun)));
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}
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// BUGBUG something is not right with the actions. It should be possible
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// to move a container into a split and have elements moved into the result.
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template(typename Rng, typename Fun)(
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requires forward_range<Rng> AND
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invocable<Fun &, iterator_t<Rng>, sentinel_t<Rng>> AND
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invocable<Fun &, iterator_t<Rng>, iterator_t<Rng>> AND
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copy_constructible<Fun> AND
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convertible_to<invoke_result_t<Fun &, iterator_t<Rng>,
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sentinel_t<Rng>>,
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std::pair<bool, iterator_t<Rng>>>)
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std::vector<split_value_t<Rng>> operator()(Rng && rng, Fun fun) const
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{
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return views::split_when(rng, std::move(fun)) |
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to<std::vector<split_value_t<Rng>>>();
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}
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template(typename Rng, typename Fun)(
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requires forward_range<Rng> AND
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predicate<Fun const &, range_reference_t<Rng>> AND
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copy_constructible<Fun>)
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std::vector<split_value_t<Rng>> operator()(Rng && rng, Fun fun) const
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{
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return views::split_when(rng, std::move(fun)) |
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to<std::vector<split_value_t<Rng>>>();
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}
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};
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/// \relates actions::split_when_fn
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RANGES_INLINE_VARIABLE(split_when_fn, split_when)
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} // namespace actions
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/// @}
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} // namespace ranges
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#include <range/v3/detail/epilogue.hpp>
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#endif
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