//===----------------------------------------------------------------------===//
//
// 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
// REQUIRES: with-pstl
// <algorithm>
// template<class ExecutionPolicy, class ForwardIterator1, class Size, class ForwardIterator2>
// ForwardIterator2 copy_n(ExecutionPolicy&& exec,
// ForwardIterator1 first, Size n,
// ForwardIterator2 result);
#include <algorithm>
#include <vector>
#include "test_macros.h"
#include "test_execution_policies.h"
#include "test_iterators.h"
EXECUTION_POLICY_SFINAE_TEST(copy_n);
static_assert(sfinae_test_copy_n<int, int*, int*, bool (*)(int)>);
static_assert(!sfinae_test_copy_n<std::execution::parallel_policy, int*, int*, int>);
template <class Iter1, class Iter2>
struct TestInt {
template <class Policy>
void operator()(Policy&& policy) {
// simple test
for (const int size : {0, 1, 2, 100, 350}) {
std::vector<int> a(size);
for (int i = 0; i != size; ++i)
a[i] = i + 1;
std::vector<int> out(std::size(a));
decltype(auto) ret = std::copy_n(policy, Iter1(std::data(a)), std::size(a), Iter2(std::data(out)));
static_assert(std::is_same_v<decltype(ret), Iter2>);
assert(base(ret) == std::data(out) + std::size(out));
for (int i = 0; i != size; ++i)
assert(out[i] == i + 1);
}
}
};
struct TestIteratorsInt {
template <class Iter2>
void operator()() {
types::for_each(types::forward_iterator_list<int*>{},
TestIteratorWithPolicies<types::partial_instantiation<TestInt, Iter2>::template apply>{});
}
};
struct CopiedToTester {
bool copied_to = false;
CopiedToTester() = default;
CopiedToTester(const CopiedToTester&) {}
CopiedToTester& operator=(const CopiedToTester&) {
assert(!copied_to);
copied_to = true;
return *this;
}
~CopiedToTester() = default;
};
template <class Iter1, class Iter2>
struct TestNonTrivial {
template <class Policy>
void operator()(Policy&& policy) {
// simple test
for (const int size : {0, 1, 2, 100, 350}) {
std::vector<CopiedToTester> a(size);
std::vector<CopiedToTester> out(std::size(a));
auto ret = std::copy_n(policy, Iter1(std::data(a)), std::size(a), Iter2(std::data(out)));
assert(base(ret) == std::data(out) + std::size(out));
assert(std::all_of(std::begin(out), std::end(out), [](CopiedToTester& t) { return t.copied_to; }));
assert(std::none_of(std::begin(a), std::end(a), [](CopiedToTester& t) { return t.copied_to; }));
}
}
};
struct TestIteratorsNonTrivial {
template <class Iter2>
void operator()() {
types::for_each(types::forward_iterator_list<CopiedToTester*>{},
TestIteratorWithPolicies<types::partial_instantiation<TestNonTrivial, Iter2>::template apply>{});
}
};
int main(int, char**) {
types::for_each(types::forward_iterator_list<int*>{}, TestIteratorsInt{});
types::for_each(types::forward_iterator_list<CopiedToTester*>{}, TestIteratorsNonTrivial{});
return 0;
}