test/std/language.support/support.dynamic/ptr.launder/launder.nodiscard.fail.cpp


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

// -*- C++ -*-
//===----------------------------------------------------------------------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

// <new>

// template <class T> constexpr T* launder(T* p) noexcept;

// UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
// UNSUPPORTED: clang-3.3, clang-3.4, clang-3.5, clang-3.6, clang-3.7, clang-3.8

#include <new>
#include <cassert>

#include "test_macros.h"

int main ()
{
    int *p = nullptr;
    std::launder(p);  // expected-error {{ignoring return value of function declared with 'nodiscard' attribute}}
}