final/test/re/re.results/re.results.size/empty.pass.cpp

//===----------------------------------------------------------------------===//
//
//                     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>

// size_type size() const;
// bool empty() const;

#include <regex>
#include <cassert>

template <class CharT>
void
test()
{
    std::match_results<const CharT*> m;
    assert(m.empty());
    assert(m.size() == 0);
    const char s[] = "abcdefghijk";
    assert(std::regex_search(s, m, std::regex("cd((e)fg)hi")));
    assert(!m.empty());
    assert(m.size() == 3);
}

int main()
{
    test<char>();
}