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//===----------------------------------------------------------------------===//
//
// 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 Predicate>
// typename iterator_traits<ForwardIterator>::difference_type
// count_if(ExecutionPolicy&& exec,
// ForwardIterator first, ForwardIterator last, Predicate pred);
#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_if);
static_assert(sfinae_test_count_if<int, int*, int*, bool (*)(int)>);
static_assert(!sfinae_test_count_if<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_if(policy, std::begin(a), std::end(a), [](int i) { return i < 3; });
static_assert(std::is_same_v<decltype(ret), typename std::iterator_traits<Iter>::difference_type>);
assert(ret == 2);
}
{ // test that an empty range works
std::array<int, 0> a;
decltype(auto) ret = std::count_if(policy, std::begin(a), std::end(a), [](int i) { return i < 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_if(policy, std::begin(a), std::end(a), [](int i) { return i < 3; });
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_if(policy, std::begin(a), std::end(a), [](int i) { return i < 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[] = {2, 3, 2};
decltype(auto) ret = std::count_if(policy, std::begin(a), std::end(a), [](int i) { return i < 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_if(policy, std::begin(a), std::end(a), [](int i) { return i < 3; });
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;
}
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