Ticket #4271: boost_split_iterator_bug.cpp

#include <iostream>
#include <string>
#include <boost/algorithm/string/find_iterator.hpp>
#include <boost/algorithm/string/finder.hpp>
#include <boost/range/iterator_range.hpp>

typedef boost::algorithm::split_iterator<std::string::const_iterator> splitter;

splitter make_splitter(const std::string& s)
{
    return boost::algorithm::make_split_iterator(s, boost::first_finder("/"));
}

void print(const splitter& it, std::string prefix = std::string())
{
    std::cout << prefix << "val='" << boost::copy_range<std::string>(*it) << "', eof=" << it.eof() << std::endl;
}

void parse(splitter it)
{
    if (it == splitter())
        return;

    print(it, "before: ");
    if (it->empty())
    {
        std::cout << "Note that eof was reset to false, not copied!" << std::endl;
        exit(1);  // Avoid endless loop; we've proved our point.
    }

    ++it;
    print(it, "after:  ");
    std::cout << std::endl;

    parse(it);    // Pass 'it' by value, calling copy ctor.
}

int main()
{
    std::string s = "abc/def/ghi/jkl";

    std::cout << "iterative version (shared iter):" << std::endl;
    for (splitter it = make_splitter(s); it != splitter(); ++it)
        print(it);
    std::cout << std::endl;

    std::cout << "recursive version (copied iter):" << std::endl;
    parse(make_splitter(s));
}