| //===----------------------------------------------------------------------===// |
| // |
| // 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, c++17 |
| // UNSUPPORTED: sanitizer-new-delete |
| |
| // template<class T> |
| // constexpr unique_ptr<T> make_unique_for_overwrite(); // T is not array |
| // |
| // template<class T> |
| // constexpr unique_ptr<T> make_unique_for_overwrite(size_t n); // T is U[] |
| |
| // Test the object is not value initialized |
| |
| #include <cassert> |
| #include <concepts> |
| #include <cstddef> |
| #include <cstdlib> |
| #include <memory> |
| |
| constexpr char pattern = 0xDE; |
| |
| void* operator new(std::size_t count) { |
| void* ptr = std::malloc(count); |
| for (std::size_t i = 0; i < count; ++i) { |
| *(reinterpret_cast<char*>(ptr) + i) = pattern; |
| } |
| return ptr; |
| } |
| |
| void* operator new[](std::size_t count) { return ::operator new(count); } |
| |
| void operator delete(void* ptr) noexcept { std::free(ptr); } |
| |
| void operator delete[](void* ptr) noexcept { ::operator delete(ptr); } |
| |
| void test() { |
| { |
| std::same_as<std::unique_ptr<int>> auto ptr = std::make_unique_for_overwrite<int>(); |
| assert(*(reinterpret_cast<char*>(ptr.get())) == pattern); |
| } |
| { |
| std::same_as<std::unique_ptr<int[]>> auto ptr = std::make_unique_for_overwrite<int[]>(3); |
| assert(*(reinterpret_cast<char*>(&ptr[0])) == pattern); |
| assert(*(reinterpret_cast<char*>(&ptr[1])) == pattern); |
| assert(*(reinterpret_cast<char*>(&ptr[2])) == pattern); |
| } |
| } |
| |
| int main(int, char**) { |
| test(); |
| |
| return 0; |
| } |