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for_each.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_FOR_EACH_HPP
14#define RANGES_V3_ALGORITHM_FOR_EACH_HPP
15
16#include <functional>
17
19
20#include <range/v3/algorithm/result_types.hpp>
29#include <range/v3/utility/static_const.hpp>
30
31#include <range/v3/detail/prologue.hpp>
32
33namespace ranges
34{
37 template<typename I, typename F>
38 using for_each_result = detail::in_fun_result<I, F>;
39
40 RANGES_FUNC_BEGIN(for_each)
41
42
43 template(typename I, typename S, typename F, typename P = identity)(
44 requires input_iterator<I> AND sentinel_for<S, I> AND
45 indirectly_unary_invocable<F, projected<I, P>>)
46 constexpr for_each_result<I, F> RANGES_FUNC(for_each)(I first, S last, F fun, P proj = P{})
47 {
48 for(; first != last; ++first)
49 {
50 invoke(fun, invoke(proj, *first));
51 }
52 return {detail::move(first), detail::move(fun)};
53 }
54
56 template(typename Rng, typename F, typename P = identity)(
57 requires input_range<Rng> AND
58 indirectly_unary_invocable<F, projected<iterator_t<Rng>, P>>)
59 constexpr for_each_result<borrowed_iterator_t<Rng>, F> //
60 RANGES_FUNC(for_each)(Rng && rng, F fun, P proj = P{})
61 {
62 return {(*this)(begin(rng), end(rng), ref(fun), detail::move(proj)).in,
63 detail::move(fun)};
64 }
65
66 RANGES_FUNC_END(for_each)
67
68 namespace cpp20
69 {
70 using ranges::for_each;
71 using ranges::for_each_result;
72 } // namespace cpp20
74} // namespace ranges
75
76#include <range/v3/detail/epilogue.hpp>
77
78#endif
typename Fn::template invoke< Args... > invoke
Evaluate the invocable Fn with the arguments Args.
Definition meta.hpp:541
front< Pair > first
Retrieve the first element of the pair Pair.
Definition meta.hpp:2251