final/test/re/re.alg/re.alg.search/backup.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>

// template <class BidirectionalIterator, class Allocator, class charT, class traits>
//     bool
//     regex_search(BidirectionalIterator first, BidirectionalIterator last,
//                  match_results<BidirectionalIterator, Allocator>& m,
//                  const basic_regex<charT, traits>& e,
//                  regex_constants::match_flag_type flags = regex_constants::match_default);

#include <regex>
#include <string>
#include <list>
#include <cassert>

int main()
{
    // This regex_iterator uses regex_search(__wrap_iter<_Iter> __first, ...)
    // Test for http://llvm.org/bugs/show_bug.cgi?id=16240 fixed in r185273.
    {
        std::string s{"aaaa a"};
        std::regex re{"\\ba"};
        std::sregex_iterator it{s.begin(), s.end(), re};
        std::sregex_iterator end{};

        assert(it->position(0) == 0);
        assert(it->length(0) == 1);

        ++it;
        assert(it->position(0) == 5);
        assert(it->length(0) == 1);

        ++it;
        assert(it == end);
    }

    // This regex_iterator uses regex_search(_BidirectionalIterator __first, ...)
    {
        std::string s{"aaaa a"};
        std::list<char> l{s.begin(), s.end()};
        std::regex re{"\\ba"};
        std::regex_iterator<std::list<char>::iterator> it{l.begin(), l.end(), re};
        std::regex_iterator<std::list<char>::iterator> end{};

        assert(it->position(0) == 0);
        assert(it->length(0) == 1);

        ++it;
        assert(it->position(0) == 5);
        assert(it->length(0) == 1);

        ++it;
        assert(it == end);
    }
}