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Telegram/ThirdParty/range-v3/include/range/v3/algorithm/generate.hpp

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+/// \file
+// Range v3 library
+//
+//  Copyright Eric Niebler 2014-present
+//
+//  Use, modification and distribution is subject to the
+//  Boost Software License, Version 1.0. (See accompanying
+//  file LICENSE_1_0.txt or copy at
+//  http://www.boost.org/LICENSE_1_0.txt)
+//
+// Project home: https://github.com/ericniebler/range-v3
+//
+#ifndef RANGES_V3_ALGORITHM_GENERATE_HPP
+#define RANGES_V3_ALGORITHM_GENERATE_HPP
+
+#include <utility>
+
+#include <range/v3/range_fwd.hpp>
+
+#include <range/v3/algorithm/result_types.hpp>
+#include <range/v3/functional/invoke.hpp>
+#include <range/v3/functional/reference_wrapper.hpp>
+#include <range/v3/iterator/concepts.hpp>
+#include <range/v3/range/access.hpp>
+#include <range/v3/range/concepts.hpp>
+#include <range/v3/range/dangling.hpp>
+#include <range/v3/range/traits.hpp>
+#include <range/v3/utility/static_const.hpp>
+
+#include <range/v3/detail/prologue.hpp>
+
+namespace ranges
+{
+    /// \addtogroup group-algorithms
+    /// @{
+    template<typename O, typename F>
+    using generate_result = detail::out_fun_result<O, F>;
+
+    RANGES_FUNC_BEGIN(generate)
+
+        /// \brief function template \c generate_n
+        template(typename O, typename S, typename F)(
+            requires invocable<F &> AND output_iterator<O, invoke_result_t<F &>> AND
+            sentinel_for<S, O>)
+        constexpr generate_result<O, F> RANGES_FUNC(generate)(O first, S last, F fun) //
+        {
+            for(; first != last; ++first)
+                *first = invoke(fun);
+            return {detail::move(first), detail::move(fun)};
+        }
+
+        /// \overload
+        template(typename Rng, typename F)(
+            requires invocable<F &> AND output_range<Rng, invoke_result_t<F &>>)
+        constexpr generate_result<borrowed_iterator_t<Rng>, F> //
+        RANGES_FUNC(generate)(Rng && rng, F fun)
+        {
+            return {(*this)(begin(rng), end(rng), ref(fun)).out, detail::move(fun)};
+        }
+
+    RANGES_FUNC_END(generate)
+
+    namespace cpp20
+    {
+        using ranges::generate;
+        using ranges::generate_result;
+    } // namespace cpp20
+    /// @}
+} // namespace ranges
+
+#include <range/v3/detail/epilogue.hpp>
+
+#endif