You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
33 lines
1007 B
C++
33 lines
1007 B
C++
// -*- C++ -*-
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// 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++98, c++03
|
|
|
|
// GCC 7 is the first version to introduce [[nodiscard]]
|
|
// UNSUPPORTED: gcc-4.9, gcc-5, gcc-6
|
|
|
|
|
|
// MODULES_DEFINES: _LIBCPP_ENABLE_NODISCARD
|
|
// MODULES_DEFINES: _LIBCPP_DISABLE_NODISCARD_EXT
|
|
#define _LIBCPP_ENABLE_NODISCARD
|
|
#define _LIBCPP_DISABLE_NODISCARD_EXT
|
|
#include <__config>
|
|
|
|
|
|
_LIBCPP_NODISCARD_EXT int foo() { return 42; }
|
|
_LIBCPP_NODISCARD_AFTER_CXX17 int bar() { return 42; }
|
|
|
|
int main(int, char**) {
|
|
bar(); // expected-error-re {{ignoring return value of function declared with {{'nodiscard'|warn_unused_result}} attribute}}
|
|
foo(); // OK.
|
|
(void)bar(); // OK.
|
|
|
|
return 0;
|
|
}
|