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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
// <memory>
// template <class ForwardIt>
// constexpr void destroy(ForwardIt, ForwardIt);
#include <memory>
#include <cassert>
#include <type_traits>
#include "test_macros.h"
#include "test_iterators.h"
struct Counted {
int* counter_;
TEST_CONSTEXPR Counted(int* counter) : counter_(counter) { ++*counter_; }
TEST_CONSTEXPR Counted(Counted const& other) : counter_(other.counter_) { ++*counter_; }
TEST_CONSTEXPR_CXX20 ~Counted() { --*counter_; }
friend void operator&(Counted) = delete;
};
#if TEST_STD_VER > 17
constexpr bool test_arrays() {
{
using Array = Counted[3];
using Alloc = std::allocator<Array>;
int counter = 0;
Alloc alloc;
Array* pool = std::allocator_traits<Alloc>::allocate(alloc, 5);
for (Array* p = pool; p != pool + 5; ++p) {
Array& arr = *p;
for (int i = 0; i != 3; ++i) {
std::allocator_traits<Alloc>::construct(alloc, std::addressof(arr[i]), &counter);
}
}
assert(counter == 5 * 3);
std::destroy(pool, pool + 5);
ASSERT_SAME_TYPE(decltype(std::destroy(pool, pool + 5)), void);
assert(counter == 0);
std::allocator_traits<Alloc>::deallocate(alloc, pool, 5);
}
{
using Array = Counted[3][2];
using Alloc = std::allocator<Array>;
int counter = 0;
Alloc alloc;
Array* pool = std::allocator_traits<Alloc>::allocate(alloc, 5);
for (Array* p = pool; p != pool + 5; ++p) {
Array& arr = *p;
for (int i = 0; i != 3; ++i) {
for (int j = 0; j != 2; ++j) {
std::allocator_traits<Alloc>::construct(alloc, std::addressof(arr[i][j]), &counter);
}
}
}
assert(counter == 5 * 3 * 2);
std::destroy(pool, pool + 5);
ASSERT_SAME_TYPE(decltype(std::destroy(pool, pool + 5)), void);
assert(counter == 0);
std::allocator_traits<Alloc>::deallocate(alloc, pool, 5);
}
return true;
}
#endif
template <class It>
TEST_CONSTEXPR_CXX20 void test() {
using Alloc = std::allocator<Counted>;
int counter = 0;
Alloc alloc;
Counted* pool = std::allocator_traits<Alloc>::allocate(alloc, 5);
for (Counted* p = pool; p != pool + 5; ++p)
std::allocator_traits<Alloc>::construct(alloc, p, &counter);
assert(counter == 5);
std::destroy(It(pool), It(pool + 5));
ASSERT_SAME_TYPE(decltype(std::destroy(It(pool), It(pool + 5))), void);
assert(counter == 0);
std::allocator_traits<Alloc>::deallocate(alloc, pool, 5);
}
TEST_CONSTEXPR_CXX20 bool tests() {
test<Counted*>();
test<forward_iterator<Counted*>>();
return true;
}
int main(int, char**) {
tests();
#if TEST_STD_VER > 17
test_arrays();
static_assert(tests());
// TODO: Until std::construct_at has support for arrays, it's impossible to test this
// in a constexpr context (see https://reviews.llvm.org/D114903).
// static_assert(test_arrays());
#endif
return 0;
}
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