Re: [boost] [date_time] [MSVC8] Memory leak in operator<<(ptime)

From: Sean Huang (huangsean_at_[hidden])
Date: 2006-02-17 13:47:06

There is a bug in std::basic_iostream in VC8 
(http://lab.msdn.microsoft.com/productfeedback/viewfeedback.aspx?feedbackid=e08bd793-3fef-40ff-adda-ed313e0eafcc) 
that affects all classes derived from it. During the output of  a ptime, a 
basic_stringstream object is created/destroyed and that is causing the 
memory leak. I personally think Microsoft should release a patch for this 
but it looks like they won't until the next release. You might be able to 
obtain a hotfix by contacting Microsoft Technical support.

On the other hand, std::basic_ostringstream/std::basic_istringstream do not 
suffer the same memory leak. And maybe data_time library can change to use 
them instead of std::basic_stringstream (line 304 in time_facet.hpp as of 
release 1.33.0). I haven't really looked into data_time library so I can not 
say this for sure.

HTH,

Sean

"Alo Sarv" <alo.sarv_at_[hidden]> wrote in message 
news:14a0620d0602161156s55640094xabd31ed80ebde1cb_at_mail.gmail.com...
> The following test app illustrates a memory leak that I'v been able to
> produce so far with MSVC 8.0 (earlier versions not tested). GCC 4.0
> seems to be unaffected. The leakage in case of this test app is around
> 12kb/s.
>
> #include <iostream>
> #include <boost/date_time/posix_time/posix_time.hpp>
> using namespace boost::posix_time;
> int main(int argc, char *argv[]) {
>  ptime t(second_clock::local_time());
>  while (true) {
>    std::cout << t << "\r";
>  }
>  return 0;
> }
>
> Tested against Boost 1.33.1 release.
>
> Compiled with
> cl test.cpp /I c:\boost_1_33_1 /D _CRT_SECURE_NO_DEPRECATE /EHsc /D
> BOOST_ALL_NO_LIB
>
> --
> Alo Sarv
>
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