File: nodiscard.verify.cpp

package info (click to toggle)
llvm-toolchain-19 1%3A19.1.7-3~deb12u1
  • links: PTS, VCS
  • area: main
  • in suites: bookworm-proposed-updates
  • size: 1,998,492 kB
  • sloc: cpp: 6,951,680; ansic: 1,486,157; asm: 913,598; python: 232,024; f90: 80,126; objc: 75,281; lisp: 37,276; pascal: 16,990; sh: 10,009; ml: 5,058; perl: 4,724; awk: 3,523; makefile: 3,167; javascript: 2,504; xml: 892; fortran: 664; cs: 573
file content (36 lines) | stat: -rw-r--r-- 1,661 bytes parent folder | download | duplicates (7)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
//===----------------------------------------------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//

// [[nodiscard]] void* operator new[](std::size_t);
// [[nodiscard]] void* operator new[](std::size_t, std::nothrow_t const&);
// [[nodiscard]] void* operator new[](std::size_t, std::align_val_t);
// [[nodiscard]] void* operator new[](std::size_t, std::align_val_t, std::nothrow_t const&);

// [[nodiscard]] is not supported at all in c++03
// UNSUPPORTED: c++03

// [[nodiscard]] enabled before C++20 in libc++ as an extension
// UNSUPPORTED: (c++11 || c++14 || c++17) && !stdlib=libc++

// Libc++ when built for z/OS doesn't contain the aligned allocation functions,
// nor does the dynamic library shipped with z/OS.
// XFAIL: target={{.+}}-zos{{.*}}

#include <new>

#include "test_macros.h"

void f() {
    ::operator new[](4);  // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
    ::operator new[](4, std::nothrow);  // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}

#if TEST_STD_VER >= 17
    ::operator new[](4, std::align_val_t{4});  // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
    ::operator new[](4, std::align_val_t{4}, std::nothrow);  // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
#endif
}