1//===----------------------------------------------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9// [[nodiscard]] void* operator new(std::size_t);
10// [[nodiscard]] void* operator new(std::size_t, std::nothrow_t const&);
11// [[nodiscard]] void* operator new(std::size_t, std::align_val_t);
12// [[nodiscard]] void* operator new(std::size_t, std::align_val_t, std::nothrow_t const&);
13
14// [[nodiscard]] is not supported at all in c++03
15// UNSUPPORTED: c++03
16
17// [[nodiscard]] enabled before C++20 in libc++ as an extension
18// UNSUPPORTED: (c++11 || c++14 || c++17) && !stdlib=libc++
19
20// Libc++ when built for z/OS doesn't contain the aligned allocation functions,
21// nor does the dynamic library shipped with z/OS.
22// XFAIL: target={{.+}}-zos{{.*}}
23
24#include <new>
25
26#include "test_macros.h"
27
28void f() {
29 ::operator new(4); // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
30 ::operator new(4, std::nothrow); // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
31
32#if TEST_STD_VER >= 17
33 ::operator new(4, std::align_val_t{4}); // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
34 ::operator new(4, std::align_val_t{4}, std::nothrow); // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
35#endif
36}
37

source code of libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.single/nodiscard.verify.cpp