1 //===----------------------------------------------------------------------===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is dual licensed under the MIT and the University of Illinois Open
6 // Source Licenses. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9
10 // <algorithm>
11
12 // template<InputIterator Iter, Callable<auto, Iter::reference> Function>
13 // requires CopyConstructible<Function>
14 // constexpr Function // constexpr after C++17
15 // for_each(Iter first, Iter last, Function f);
16
17 #include <algorithm>
18 #include <cassert>
19
20 #include "test_macros.h"
21 #include "test_iterators.h"
22
23 #if TEST_STD_VER > 17
test_constexpr()24 TEST_CONSTEXPR bool test_constexpr() {
25 int ia[] = {1, 3, 6, 7};
26 int expected[] = {3, 5, 8, 9};
27
28 std::for_each(std::begin(ia), std::end(ia), [](int &a) { a += 2; });
29 return std::equal(std::begin(ia), std::end(ia), std::begin(expected))
30 ;
31 }
32 #endif
33
34 struct for_each_test
35 {
for_each_testfor_each_test36 for_each_test(int c) : count(c) {}
37 int count;
operator ()for_each_test38 void operator()(int& i) {++i; ++count;}
39 };
40
main()41 int main()
42 {
43 int ia[] = {0, 1, 2, 3, 4, 5};
44 const unsigned s = sizeof(ia)/sizeof(ia[0]);
45 for_each_test f = std::for_each(input_iterator<int*>(ia),
46 input_iterator<int*>(ia+s),
47 for_each_test(0));
48 assert(f.count == s);
49 for (unsigned i = 0; i < s; ++i)
50 assert(ia[i] == static_cast<int>(i+1));
51
52 #if TEST_STD_VER > 17
53 static_assert(test_constexpr());
54 #endif
55 }
56