| //===----------------------------------------------------------------------===// |
| // |
| // 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 |
| // |
| //===----------------------------------------------------------------------===// |
| |
| // <memory> |
| |
| // template <class Alloc> |
| // struct allocator_traits |
| // { |
| // template <class Ptr> |
| // static constexpr void destroy(allocator_type& a, Ptr p); |
| // ... |
| // }; |
| |
| #include <memory> |
| #include <cassert> |
| #include <cstddef> |
| |
| #include "test_macros.h" |
| #include "incomplete_type_helper.h" |
| |
| template <class T> |
| struct NoDestroy |
| { |
| typedef T value_type; |
| |
| TEST_CONSTEXPR_CXX20 T* allocate(std::size_t n) |
| { |
| return std::allocator<T>().allocate(n); |
| } |
| |
| TEST_CONSTEXPR_CXX20 void deallocate(T* p, std::size_t n) |
| { |
| return std::allocator<T>().deallocate(p, n); |
| } |
| }; |
| |
| template <class T> |
| struct CountDestroy |
| { |
| TEST_CONSTEXPR explicit CountDestroy(int* counter) |
| : counter_(counter) |
| { } |
| |
| typedef T value_type; |
| |
| TEST_CONSTEXPR_CXX20 T* allocate(std::size_t n) |
| { |
| return std::allocator<T>().allocate(n); |
| } |
| |
| TEST_CONSTEXPR_CXX20 void deallocate(T* p, std::size_t n) |
| { |
| return std::allocator<T>().deallocate(p, n); |
| } |
| |
| template <class U> |
| TEST_CONSTEXPR_CXX20 void destroy(U* p) |
| { |
| ++*counter_; |
| p->~U(); |
| } |
| |
| int* counter_; |
| }; |
| |
| struct CountDestructor |
| { |
| TEST_CONSTEXPR explicit CountDestructor(int* counter) |
| : counter_(counter) |
| { } |
| |
| TEST_CONSTEXPR_CXX20 ~CountDestructor() { ++*counter_; } |
| |
| int* counter_; |
| }; |
| |
| TEST_CONSTEXPR_CXX20 bool test() |
| { |
| { |
| typedef NoDestroy<CountDestructor> Alloc; |
| int destructors = 0; |
| Alloc alloc; |
| CountDestructor* pool = std::allocator_traits<Alloc>::allocate(alloc, 1); |
| |
| std::allocator_traits<Alloc>::construct(alloc, pool, &destructors); |
| assert(destructors == 0); |
| |
| std::allocator_traits<Alloc>::destroy(alloc, pool); |
| assert(destructors == 1); |
| |
| std::allocator_traits<Alloc>::deallocate(alloc, pool, 1); |
| } |
| { |
| typedef IncompleteHolder* T; |
| typedef NoDestroy<T> Alloc; |
| Alloc alloc; |
| T* pool = std::allocator_traits<Alloc>::allocate(alloc, 1); |
| std::allocator_traits<Alloc>::construct(alloc, pool, nullptr); |
| std::allocator_traits<Alloc>::destroy(alloc, pool); |
| std::allocator_traits<Alloc>::deallocate(alloc, pool, 1); |
| } |
| { |
| typedef CountDestroy<CountDestructor> Alloc; |
| int destroys_called = 0; |
| int destructors_called = 0; |
| Alloc alloc(&destroys_called); |
| |
| CountDestructor* pool = std::allocator_traits<Alloc>::allocate(alloc, 1); |
| std::allocator_traits<Alloc>::construct(alloc, pool, &destructors_called); |
| assert(destroys_called == 0); |
| assert(destructors_called == 0); |
| |
| std::allocator_traits<Alloc>::destroy(alloc, pool); |
| assert(destroys_called == 1); |
| assert(destructors_called == 1); |
| |
| std::allocator_traits<Alloc>::deallocate(alloc, pool, 1); |
| } |
| return true; |
| } |
| |
| int main(int, char**) |
| { |
| test(); |
| #if TEST_STD_VER > 17 |
| static_assert(test()); |
| #endif |
| return 0; |
| } |