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087c094fec
Summary: This provides the `std::destroying_delete_t` declaration in C++2a and after. (Even when the compiler doesn't support the language feature). However, the feature test macro `__cpp_lib_destroying_delete` is only defined when we have both language support and C++2a. Reviewers: ldionne, ckennelly, serge-sans-paille, EricWF Reviewed By: EricWF Subscribers: dexonsmith, riccibruno, christof, jwakely, jdoerfert, mclow.lists, ldionne, libcxx-commits Differential Revision: https://reviews.llvm.org/D55840 git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@361572 91177308-0d34-0410-b5e6-96231b3b80d8
66 lines
1.4 KiB
C++
66 lines
1.4 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is dual licensed under the MIT and the University of Illinois Open
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// Source Licenses. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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// struct destroying_delete_t {
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// explicit destroying_delete_t() = default;
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// };
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// inline constexpr destroying_delete_t destroying_delete{};
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// UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
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#include <new>
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#include <cassert>
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#include "test_macros.h"
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struct A {
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void *data;
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A();
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~A();
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static A* New();
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void operator delete(A*, std::destroying_delete_t);
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};
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bool A_constructed = false;
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bool A_destroyed = false;
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bool A_destroying_deleted = false;
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A::A() {
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A_constructed = true;
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}
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A::~A() {
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A_destroyed = true;
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}
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A* A::New() {
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return new(::operator new(sizeof(A))) A();
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}
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void A::operator delete(A* a, std::destroying_delete_t) {
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A_destroying_deleted = true;
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::operator delete(a);
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}
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#ifndef __cpp_lib_destroying_delete
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#error "Expected __cpp_lib_destroying_delete to be defined"
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#elif __cpp_lib_destroying_delete < 201806L
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#error "Unexpected value of __cpp_lib_destroying_delete"
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#endif
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int main() {
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// Ensure that we call the destroying delete and not the destructor.
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A* ap = A::New();
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assert(A_constructed);
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delete ap;
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assert(!A_destroyed);
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assert(A_destroying_deleted);
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}
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