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69 lines
1.9 KiB
C++
69 lines
1.9 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_JOIN_HPP
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#define RANGES_V3_ACTION_JOIN_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/action/push_back.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/utility/static_const.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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template<typename Rng>
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using join_action_value_t_ =
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meta::if_c<(bool)ranges::container<range_value_t<Rng>>, //
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range_value_t<Rng>, //
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std::vector<range_value_t<range_value_t<Rng>>>>;
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struct join_fn
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{
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template(typename Rng)(
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requires input_range<Rng> AND input_range<range_value_t<Rng>> AND
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semiregular<join_action_value_t_<Rng>>)
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join_action_value_t_<Rng> operator()(Rng && rng) const
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{
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join_action_value_t_<Rng> ret;
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auto last = ranges::end(rng);
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for(auto it = begin(rng); it != last; ++it)
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push_back(ret, *it);
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return ret;
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}
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};
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/// \relates actions::join_fn
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/// \sa action_closure
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RANGES_INLINE_VARIABLE(action_closure<join_fn>, join)
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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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