[Boost-bugs] [Boost C++ Libraries] #4751: Breaking change between 1.41 and 1.44in split

Subject: [Boost-bugs] [Boost C++ Libraries] #4751: Breaking change between 1.41 and 1.44in split
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2010-10-18 19:10:30

#4751: Breaking change between 1.41 and 1.44in split
---------------------------------------------+------------------------------
 Reporter:  henry_christophe@…               |       Owner:  pavol_droba
     Type:  Bugs                             |      Status:  new        
Milestone:  To Be Determined                 |   Component:  string_algo
  Version:  Boost 1.44.0                     |    Severity:  Regression 
 Keywords:                                   |  
---------------------------------------------+------------------------------
 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.

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/4751>
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