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 // <regex> 12 13 // class match_results<BidirectionalIterator, Allocator> 14 // bool empty() const; 15 16 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17 17 // UNSUPPORTED: clang-3.3, clang-3.4, clang-3.5, clang-3.6, clang-3.7, clang-3.8 18 19 #include <regex> 20 21 #include "test_macros.h" 22 23 int main () 24 { 25 std::match_results<const char*> c; 26 c.empty(); // expected-error {{ignoring return value of function declared with 'nodiscard' attribute}} 27 } 28
