test/std/re/re.results/re.results.size/empty.fail.cpp


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// -*- 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.
//
//===----------------------------------------------------------------------===//

// <regex>

// class match_results<BidirectionalIterator, Allocator>
// bool empty() const;

// 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 <regex>

#include "test_macros.h"

int main ()
{
    std::match_results<const char*> c;
    c.empty();  // expected-error {{ignoring return value of function declared with 'nodiscard' attribute}}
}