1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
|
//===----------------------------------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
// <algorithm>
// template<InputIterator Iter, Callable<auto, Iter::reference> Function>
// requires CopyConstructible<Function>
// constexpr Function // constexpr after C++17
// for_each(Iter first, Iter last, Function f);
#include <algorithm>
#include <cassert>
#include "test_macros.h"
#include "test_iterators.h"
#if TEST_STD_VER > 17
TEST_CONSTEXPR bool test_constexpr() {
int ia[] = {1, 3, 6, 7};
int expected[] = {3, 5, 8, 9};
std::for_each(std::begin(ia), std::end(ia), [](int &a) { a += 2; });
return std::equal(std::begin(ia), std::end(ia), std::begin(expected))
;
}
#endif
struct for_each_test
{
for_each_test(int c) : count(c) {}
int count;
void operator()(int& i) {++i; ++count;}
};
int main()
{
int ia[] = {0, 1, 2, 3, 4, 5};
const unsigned s = sizeof(ia)/sizeof(ia[0]);
for_each_test f = std::for_each(input_iterator<int*>(ia),
input_iterator<int*>(ia+s),
for_each_test(0));
assert(f.count == s);
for (unsigned i = 0; i < s; ++i)
assert(ia[i] == static_cast<int>(i+1));
#if TEST_STD_VER > 17
static_assert(test_constexpr());
#endif
}
|
