1 // -*- C++ -*- 2 //===----------------------------------------------------------------------===// 3 // 4 // The LLVM Compiler Infrastructure 5 // 6 // This file is dual licensed under the MIT and the University of Illinois Open 7 // Source Licenses. See LICENSE.TXT for details. 8 // 9 //===----------------------------------------------------------------------===// 10 11 // <new> 12 13 // template <class T> constexpr T* launder(T* p) noexcept; 14 15 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17 16 // UNSUPPORTED: clang-3.3, clang-3.4, clang-3.5, clang-3.6, clang-3.7, clang-3.8 17 18 #include <new> 19 #include <cassert> 20 21 #include "test_macros.h" 22 23 int main () 24 { 25 int *p = nullptr; 26 std::launder(p); // expected-error {{ignoring return value of function declared with 'nodiscard' attribute}} 27 } 28
