1//===----------------------------------------------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9// <algorithm>
10
11// template<ForwardIterator Iter, Callable Generator>
12// requires OutputIterator<Iter, Generator::result_type>
13// && CopyConstructible<Generator>
14// constexpr void // constexpr after c++17
15// generate(Iter first, Iter last, Generator gen);
16
17#include <algorithm>
18#include <cassert>
19
20#include "test_macros.h"
21#include "test_iterators.h"
22
23struct gen_test
24{
25 TEST_CONSTEXPR int operator()() const {return 1;}
26};
27
28
29#if TEST_STD_VER > 17
30TEST_CONSTEXPR bool test_constexpr() {
31 int ia[] = {0, 1, 2, 3, 4};
32
33 std::generate(std::begin(ia), std::end(ia), gen_test());
34
35 return std::all_of(std::begin(ia), std::end(ia), [](int x) { return x == 1; })
36 ;
37 }
38#endif
39
40
41template <class Iter>
42void
43test()
44{
45 const unsigned n = 4;
46 int ia[n] = {0};
47 std::generate(Iter(ia), Iter(ia+n), gen_test());
48 assert(ia[0] == 1);
49 assert(ia[1] == 1);
50 assert(ia[2] == 1);
51 assert(ia[3] == 1);
52}
53
54int main(int, char**)
55{
56 test<forward_iterator<int*> >();
57 test<bidirectional_iterator<int*> >();
58 test<random_access_iterator<int*> >();
59 test<int*>();
60
61#if TEST_STD_VER > 17
62 static_assert(test_constexpr());
63#endif
64
65 return 0;
66}
67

source code of libcxx/test/std/algorithms/alg.modifying.operations/alg.generate/generate.pass.cpp