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generate.hpp
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1
2// Range v3 library
3//
4// Copyright Eric Niebler 2014-present
5//
6// Use, modification and distribution is subject to the
7// Boost Software License, Version 1.0. (See accompanying
8// file LICENSE_1_0.txt or copy at
9// http://www.boost.org/LICENSE_1_0.txt)
10//
11// Project home: https://github.com/ericniebler/range-v3
12//
13#ifndef RANGES_V3_ALGORITHM_GENERATE_HPP
14#define RANGES_V3_ALGORITHM_GENERATE_HPP
15
16#include <utility>
17
19
20#include <range/v3/algorithm/result_types.hpp>
28#include <range/v3/utility/static_const.hpp>
29
30#include <range/v3/detail/prologue.hpp>
31
32namespace ranges
33{
36 template<typename O, typename F>
37 using generate_result = detail::out_fun_result<O, F>;
38
39 RANGES_FUNC_BEGIN(generate)
40
41
42 template(typename O, typename S, typename F)(
43 requires invocable<F &> AND output_iterator<O, invoke_result_t<F &>> AND
44 sentinel_for<S, O>)
45 constexpr generate_result<O, F> RANGES_FUNC(generate)(O first, S last, F fun) //
46 {
47 for(; first != last; ++first)
48 *first = invoke(fun);
49 return {detail::move(first), detail::move(fun)};
50 }
51
53 template(typename Rng, typename F)(
54 requires invocable<F &> AND output_range<Rng, invoke_result_t<F &>>)
55 constexpr generate_result<borrowed_iterator_t<Rng>, F> //
56 RANGES_FUNC(generate)(Rng && rng, F fun)
57 {
58 return {(*this)(begin(rng), end(rng), ref(fun)).out, detail::move(fun)};
59 }
60
61 RANGES_FUNC_END(generate)
62
63 namespace cpp20
64 {
65 using ranges::generate;
66 using ranges::generate_result;
67 } // namespace cpp20
69} // namespace ranges
70
71#include <range/v3/detail/epilogue.hpp>
72
73#endif
The invocable concept.
The output_iterator concept.
The output_range concept.
The sentinel_for concept.