Re: [boost] Fwd: [String algo] Breaking change between 1.41 and 1.44 in split

Subject: Re: [boost] Fwd: [String algo] Breaking change between 1.41 and 1.44 in split
From: Pavol Droba (droba_at_[hidden])
Date: 2010-10-15 15:38:00

Hello,

First of all, I would suggest you to post requests such as this to trac.  
I'm not able to
follow the list regularly and a single mail is easy to miss.

I'm not aware about any change that could cause such a result as you  
describe in between
versions 1.41 and 1.44 so I really need to investigate it.

I'll let you know later.

Best Regards,
Pavol.

On Thu, 14 Oct 2010 21:54:16 +0200, Christophe Henry  
<christophe.j.henry_at_[hidden]> wrote:

> As I got no answer on the user list, I try again.
> Is the library still maintained?
>
>
>
> ---------- Forwarded message ----------
> From: Christophe Henry <christophe.j.henry_at_[hidden]>
> Date: 2010/10/13
> Subject: [String algo] Breaking change between 1.41 and 1.44 in split
> To: boost-users_at_[hidden]
>
>
> Hi,
>
> 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.
> This brings me to the question, before I start updating my code, is
> this change a design decision or an accident?
>
> Thanks,
>
> Christophe
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