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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 T>
// constexpr void destroy_at(T*);
#include <memory>
#include <cassert>
#include <type_traits>
#include "test_macros.h"
struct Counted {
int* counter_;
TEST_CONSTEXPR Counted(int* counter) : counter_(counter) { ++*counter_; }
TEST_CONSTEXPR_CXX20 ~Counted() { --*counter_; }
friend void operator&(Counted) = delete;
};
struct VirtualCounted {
int* counter_;
TEST_CONSTEXPR VirtualCounted(int* counter) : counter_(counter) { ++*counter_; }
TEST_CONSTEXPR_CXX20 virtual ~VirtualCounted() { --*counter_; }
void operator&() const = delete;
};
struct DerivedCounted : VirtualCounted {
TEST_CONSTEXPR DerivedCounted(int* counter) : VirtualCounted(counter) { }
TEST_CONSTEXPR_CXX20 ~DerivedCounted() override { }
};
#if TEST_STD_VER > 17
constexpr bool test_arrays() {
{
using Array = Counted[3];
using Alloc = std::allocator<Array>;
Alloc alloc;
Array* ptr = std::allocator_traits<Alloc>::allocate(alloc, 1);
Array& arr = *ptr;
int counter = 0;
for (int i = 0; i != 3; ++i)
std::allocator_traits<Alloc>::construct(alloc, std::addressof(arr[i]), &counter);
assert(counter == 3);
std::destroy_at(ptr);
ASSERT_SAME_TYPE(decltype(std::destroy_at(ptr)), void);
assert(counter == 0);
std::allocator_traits<Alloc>::deallocate(alloc, ptr, 1);
}
{
using Array = Counted[3][2];
using Alloc = std::allocator<Array>;
Alloc alloc;
Array* ptr = std::allocator_traits<Alloc>::allocate(alloc, 1);
Array& arr = *ptr;
int counter = 0;
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 == 3 * 2);
std::destroy_at(ptr);
ASSERT_SAME_TYPE(decltype(std::destroy_at(ptr)), void);
assert(counter == 0);
std::allocator_traits<Alloc>::deallocate(alloc, ptr, 1);
}
return true;
}
#endif
TEST_CONSTEXPR_CXX20 bool test() {
{
using Alloc = std::allocator<Counted>;
Alloc alloc;
Counted* ptr1 = std::allocator_traits<Alloc>::allocate(alloc, 1);
Counted* ptr2 = std::allocator_traits<Alloc>::allocate(alloc, 1);
int counter = 0;
std::allocator_traits<Alloc>::construct(alloc, ptr1, &counter);
std::allocator_traits<Alloc>::construct(alloc, ptr2, &counter);
assert(counter == 2);
std::destroy_at(ptr1);
ASSERT_SAME_TYPE(decltype(std::destroy_at(ptr1)), void);
assert(counter == 1);
std::destroy_at(ptr2);
assert(counter == 0);
std::allocator_traits<Alloc>::deallocate(alloc, ptr1, 1);
std::allocator_traits<Alloc>::deallocate(alloc, ptr2, 1);
}
{
using Alloc = std::allocator<DerivedCounted>;
Alloc alloc;
DerivedCounted* ptr1 = std::allocator_traits<Alloc>::allocate(alloc, 1);
DerivedCounted* ptr2 = std::allocator_traits<Alloc>::allocate(alloc, 1);
int counter = 0;
std::allocator_traits<Alloc>::construct(alloc, ptr1, &counter);
std::allocator_traits<Alloc>::construct(alloc, ptr2, &counter);
assert(counter == 2);
std::destroy_at(ptr1);
ASSERT_SAME_TYPE(decltype(std::destroy_at(ptr1)), void);
assert(counter == 1);
std::destroy_at(ptr2);
assert(counter == 0);
std::allocator_traits<Alloc>::deallocate(alloc, ptr1, 1);
std::allocator_traits<Alloc>::deallocate(alloc, ptr2, 1);
}
return true;
}
int main(int, char**) {
test();
#if TEST_STD_VER > 17
test_arrays();
static_assert(test());
// 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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