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find_if.hpp
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1
2// Range v3 library
3//
4// Copyright Eric Niebler 2013-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_FIND_IF_HPP
14#define RANGES_V3_ALGORITHM_FIND_IF_HPP
15
16#include <utility>
17
19
28#include <range/v3/utility/static_const.hpp>
29
30#include <range/v3/detail/prologue.hpp>
31
32namespace ranges
33{
36 RANGES_FUNC_BEGIN(find_if)
48 template(typename I, typename S, typename F, typename P = identity)(
49 requires input_iterator<I> AND sentinel_for<S, I> AND
50 indirect_unary_predicate<F, projected<I, P>>)
51 constexpr I RANGES_FUNC(find_if)(I first, S last, F pred, P proj = P{})
52 {
53 for(; first != last; ++first)
54 if(invoke(pred, invoke(proj, *first)))
55 break;
56 return first;
57 }
58
60 template(typename Rng, typename F, typename P = identity)(
61 requires input_range<Rng> AND
62 indirect_unary_predicate<F, projected<iterator_t<Rng>, P>>)
63 constexpr borrowed_iterator_t<Rng> RANGES_FUNC(find_if)(Rng && rng, F pred, P proj = P{})
64 {
65 return (*this)(begin(rng), end(rng), std::move(pred), std::move(proj));
66 }
67
68 RANGES_FUNC_END(find_if)
69
70 namespace cpp20
71 {
72 using ranges::find_if;
73 }
75} // namespace ranges
76
77#include <range/v3/detail/epilogue.hpp>
78
79#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