mirror of https://github.com/axmolengine/axmol.git
68 lines
1.8 KiB
C++
68 lines
1.8 KiB
C++
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/// \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_N_HPP
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#define RANGES_V3_ALGORITHM_GENERATE_N_HPP
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#include <tuple>
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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/iterator/concepts.hpp>
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#include <range/v3/iterator/operations.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/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_n_result = detail::out_fun_result<O, F>;
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RANGES_FUNC_BEGIN(generate_n)
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/// \brief function template \c generate_n
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template(typename O, typename F)(
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requires invocable<F &> AND output_iterator<O, invoke_result_t<F &>>)
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constexpr generate_n_result<O, F> //
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RANGES_FUNC(generate_n)(O first, iter_difference_t<O> n, F fun)
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{
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RANGES_EXPECT(n >= 0);
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auto norig = n;
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auto b = uncounted(first);
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for(; 0 != n; ++b, --n)
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*b = invoke(fun);
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return {recounted(first, b, norig), detail::move(fun)};
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}
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RANGES_FUNC_END(generate_n)
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namespace cpp20
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{
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using ranges::generate_n;
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using ranges::generate_n_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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