Subject: Re: [boost] Result of boost::split against empty string changed in post-1.45 release
From: Pavol Droba (droba_at_[hidden])
Date: 2012-06-11 14:09:00
On Mon, 11 Jun 2012 16:58:40 +0200, Mateusz Loskot <mateusz_at_[hidden]>
> I have a simple program runs boost::split against empty string.
> I'm testing with Boost 1.45 and later versions like 1.46 or 1.49.
> As stated in the // comment below, there is difference in behaviour
> depending on the Boost version:
> // https://gist.github.com/2910461
> #include <cassert>
> #include <string>
> #include <vector>
> #include <boost/algorithm/string/split.hpp>
> #include <boost/algorithm/string/classification.hpp>
> int main(int argc, wchar_t* argv)
> std::wstring s;
> std::vector<std::wstring> a;
> boost::split(a, s, boost::is_any_of(L", "),
> // Boost 1.45: true
> // Boost 1.46+: false
> // Assertion failed: s.empty() == a.empty(), file
> boost_split_empty_string.cpp, line 16
> assert(s.empty() == a.empty());
> return 0;
> IMHO, the behaviour exposed in newer versions is a bug.
> Could anyone shed light on what happened in post-1.46?
Please search the boos archives. There was an extensive discussion about
The current behavior is consistent with the assertion that split always
returns n+1 tokens where n is number of separators in the input string.
Boost list run by bdawes at acm.org, gregod at cs.rpi.edu, cpdaniel at pacbell.net, john at johnmaddock.co.uk