Breaking change between 1.41 and 1.44in split

[henry_christophe@…]

I noticed a breaking change in the split function when the input string is empty. Consider the following example:

#include <string> #include <vector> #include <iostream> #include <boost/algorithm/string/split.hpp> #include <boost/algorithm/string/classification.hpp>

int main() {

std::vector<std::string> result; std::string empty_string; boost::algorithm::split( result,

empty_string,boost::algorithm::is_any_of( "\t" ),boost::algorithm::token_compress_off);

std::cout << "result size: " << result.size() << std::endl; return 0;

}

With boost 1.41 I get: result size: 1 With 1.44 I get: result size: 0

Meaning that splitting an empty string now has a new meaning. All I found to this subject was that 1 seems to be the correct answer (​http://lists.boost.org/Archives/boost/2005/07/90266.php). Furthermore, there has been, according to the release notes, no change to string algo since the 1.41.

[Vladimir Prus]

It's not apparent to me that new behaviour is wrong. Anyway, how about looking at SVN log to determine who changed that, and talk to that person?

I'm marking this Showstopper since Eric expressed a wish to have this resolved for 1.45.

[Pavol Droba]

Actually, there was one change. A small fix, that should not have such an effect. But it might be possible that the fix uncovered another problem. Anyway I will fix the issue soon. Just give me a coupe of days.

[Pavol Droba]

I have just commited the fix into the trunk. But I probably cannot merge to the release now. Sorry I was not able to fix it sooner.