[Boost-users] Possible bug: regex, lexical_cast

Subject: [Boost-users] Possible bug: regex, lexical_cast
From: John.X.Foster_at_[hidden]
Date: 2010-04-11 22:46:29

Hi all

I have come across a bug associated with lexical_cast and regex (though 
the culprit may well be the Visual C++ compiler). I have stripped the code 
to the bare essentials. This worked OK under VC++ 8 (2005), but gives an 
access violation under VC++ 9 (2008). This occurs with both boost 1.39 and 
1.42. 

Simplified code follows:

#define _SECURE_SCL 0
#define _HAS_ITERATOR_DEBUGGING 0

#include <boost/lexical_cast.hpp>
#include <boost/regex.hpp>

#include <string>
#include <iostream>

void violate()
{
        int i = 0;
        std::string x = "x" + boost::lexical_cast<std::string>(i);
        boost::regex regex("aaa");
        boost::regex_replace(x, regex, "bbb", boost::match_default);
}
int main()
{
        violate();

        std::cout << "Enter to exit\n";
        std::cin.get();
}

In debug mode, the following exception message is generated:

Unhandled exception at 0x10487b3f (msvcp90d.dll) in RegexBug.exe: 
0xC0000005: Access violation writing location 0xcccccccc.

Stack at time of exception is:

msvcp90d.dll!std::_Container_base_secure::_Orphan_all()  Line 223 + 0x5 
bytes   C++
msvcp90d.dll!std::_Container_base_secure::~_Container_base_secure()  Line 
115     C++
msvcp90d.dll!std::_String_base::~_String_base()  + 0x11 bytes   C++
msvcp90d.dll!std::_String_val<unsigned short,std::allocator<unsigned 
short> >::~_String_val<unsigned short,std::allocator<unsigned short> >() + 
0x11 bytes      C++
msvcp90d.dll!std::basic_string<char,std::char_traits<char>,std::allocator<char> 
>::~basic_string<char,std::char_traits<char>,std::allocator<char> >() Line 
917 + 0xf bytes C++
RegexBug.exe!violate()  Line 16 + 0x1e bytes    C++
RegexBug.exe!main()  Line 21    C++
RegexBug.exe!__tmainCRTStartup()  Line 586 + 0x19 bytes C
RegexBug.exe!mainCRTStartup()  Line 403 C
kernel32.dll!7c817067() 
[Frames below may be incorrect and/or missing, no symbols loaded for 
kernel32.dll] 

While I have found several work-arounds, it would be useful to log this, 
if it is a bug, in the correct place - boost? MS?

Appologies for the extended junk at the end of this email!

John
John Foster

Senior Quantitative Credit Developer
Model Development, Group Credit Portfolio & Models
National Australia Bank

Level 15, 500 Bourke St, Melbourne VIC 3000
Tel: [phone] 
Email:  John.X.Foster_at_[hidden] 

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