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
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
|
//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++03, c++11, c++14
// UNSUPPORTED: libcpp-has-no-incomplete-pstl
// <algorithm>
// template<class ExecutionPolicy, class ForwardIterator, class T>
// typename iterator_traits<ForwardIterator>::difference_type
// count(ExecutionPolicy&& exec,
// ForwardIterator first, ForwardIterator last, const T& value);
#include <algorithm>
#include <array>
#include <cassert>
#include <vector>
#include "test_macros.h"
#include "test_execution_policies.h"
#include "test_iterators.h"
EXECUTION_POLICY_SFINAE_TEST(count);
static_assert(sfinae_test_count<int, int*, int*, bool (*)(int)>);
static_assert(!sfinae_test_count<std::execution::parallel_policy, int*, int*, int>);
template <class Iter>
struct Test {
template <class Policy>
void operator()(Policy&& policy) {
{ // simple test
int a[] = {1, 2, 3, 4, 5};
decltype(auto) ret = std::count(policy, std::begin(a), std::end(a), 3);
static_assert(std::is_same_v<decltype(ret), typename std::iterator_traits<Iter>::difference_type>);
assert(ret == 1);
}
{ // test that an empty range works
std::array<int, 0> a;
decltype(auto) ret = std::count(policy, std::begin(a), std::end(a), 3);
static_assert(std::is_same_v<decltype(ret), typename std::iterator_traits<Iter>::difference_type>);
assert(ret == 0);
}
{ // test that a single-element range works
int a[] = {1};
decltype(auto) ret = std::count(policy, std::begin(a), std::end(a), 1);
static_assert(std::is_same_v<decltype(ret), typename std::iterator_traits<Iter>::difference_type>);
assert(ret == 1);
}
{ // test that a two-element range works
int a[] = {1, 3};
decltype(auto) ret = std::count(policy, std::begin(a), std::end(a), 3);
static_assert(std::is_same_v<decltype(ret), typename std::iterator_traits<Iter>::difference_type>);
assert(ret == 1);
}
{ // test that a three-element range works
int a[] = {3, 1, 3};
decltype(auto) ret = std::count(policy, std::begin(a), std::end(a), 3);
static_assert(std::is_same_v<decltype(ret), typename std::iterator_traits<Iter>::difference_type>);
assert(ret == 2);
}
{ // test that a large range works
std::vector<int> a(100, 2);
decltype(auto) ret = std::count(policy, std::begin(a), std::end(a), 2);
static_assert(std::is_same_v<decltype(ret), typename std::iterator_traits<Iter>::difference_type>);
assert(ret == 100);
}
}
};
int main(int, char**) {
types::for_each(types::forward_iterator_list<int*>{}, TestIteratorWithPolicies<Test>{});
return 0;
}
|
