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

//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

// <regex>

// class match_results<BidirectionalIterator, Allocator>

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

#include <regex>
#include <cassert>
#include "test_macros.h"

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>();
}