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, class T>
13 // requires HasEqualTo<Iter::value_type, T>
14 // constexpr Iter::difference_type // constexpr after C++17
15 // count(Iter first, Iter last, const T& value);
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[] = {0, 1, 2, 2, 0, 1, 2, 3};
26 int ib[] = {1, 2, 3, 4, 5, 6};
27 return (std::count(std::begin(ia), std::end(ia), 2) == 3)
28 && (std::count(std::begin(ib), std::end(ib), 9) == 0)
29 ;
30 }
31 #endif
32
main()33 int main()
34 {
35 int ia[] = {0, 1, 2, 2, 0, 1, 2, 3};
36 const unsigned sa = sizeof(ia)/sizeof(ia[0]);
37 assert(std::count(input_iterator<const int*>(ia),
38 input_iterator<const int*>(ia + sa), 2) == 3);
39 assert(std::count(input_iterator<const int*>(ia),
40 input_iterator<const int*>(ia + sa), 7) == 0);
41 assert(std::count(input_iterator<const int*>(ia),
42 input_iterator<const int*>(ia), 2) == 0);
43
44 #if TEST_STD_VER > 17
45 static_assert(test_constexpr());
46 #endif
47 }
48