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74 lines
2.1 KiB
C++
74 lines
2.1 KiB
C++
/// \file
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// Range v3 library
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//
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// Copyright Eric Niebler 2014-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_ALGORITHM_GENERATE_HPP
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#define RANGES_V3_ALGORITHM_GENERATE_HPP
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#include <utility>
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#include <range/v3/range_fwd.hpp>
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#include <range/v3/algorithm/result_types.hpp>
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#include <range/v3/functional/invoke.hpp>
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#include <range/v3/functional/reference_wrapper.hpp>
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#include <range/v3/iterator/concepts.hpp>
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#include <range/v3/range/access.hpp>
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#include <range/v3/range/concepts.hpp>
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#include <range/v3/range/dangling.hpp>
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#include <range/v3/range/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-algorithms
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/// @{
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template<typename O, typename F>
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using generate_result = detail::out_fun_result<O, F>;
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RANGES_FUNC_BEGIN(generate)
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/// \brief function template \c generate_n
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template(typename O, typename S, typename F)(
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requires invocable<F &> AND output_iterator<O, invoke_result_t<F &>> AND
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sentinel_for<S, O>)
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constexpr generate_result<O, F> RANGES_FUNC(generate)(O first, S last, F fun) //
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{
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for(; first != last; ++first)
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*first = invoke(fun);
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return {detail::move(first), detail::move(fun)};
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}
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/// \overload
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template(typename Rng, typename F)(
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requires invocable<F &> AND output_range<Rng, invoke_result_t<F &>>)
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constexpr generate_result<borrowed_iterator_t<Rng>, F> //
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RANGES_FUNC(generate)(Rng && rng, F fun)
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{
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return {(*this)(begin(rng), end(rng), ref(fun)).out, detail::move(fun)};
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}
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RANGES_FUNC_END(generate)
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namespace cpp20
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{
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using ranges::generate;
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using ranges::generate_result;
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} // namespace cpp20
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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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