Re: Problem with Map Iterator

["Burak Serdar" <bserdar at ieee dot org>]

As far as I know, map::erase invalidates the iterator, so incrementing
the iterator after erasing it is invalid.

On 5/15/06, Sanjib Talukdar <sanjibt@ascindia.com> wrote:
> Hi,
>
> I am getting a segmentation fault error while executing the following
> code:
>
>         if (!this->colDtlsByName.empty())
>         {
>              std::map< std::string, CS_DATAFMT*,
>              std::less<std::string> >::iterator iterMap;
>             for (iterMap = this->colDtlsByName.begin();
>                 iterMap != this->colDtlsByName.end(); ++iterMap)
>            {
>                CS_DATAFMT* obj = iterMap->second;
>                if (obj != NULL)
>                      delete obj;
>                this->colDtlsByName.erase(iterMap);
>            }
>         }
>
> The backtrace from gdb is as follows:
>
>         #0  0xff0e29b4 in std::_Rb_tree_increment () from
> /usr/sfw/lib/libstdc++.so.6
>         #1  0x0009854c in std::_Rb_tree_iterator<std::pair<std::string
> const, _cs_datafmt*> >::operator++ (this=0xfe77a0c4) at stl_tree.h:180
>         #2  0x0005a84c in MACDBQueryHandler::clearColInfo
> (this=0xfe77bd30, inType=ALL)
>             at MACDBQueryHandler.C:123
>
> The above code is in the method MACDBQueryHandler::clearColInfo() which
> is being invoked in the class destructor.
> We are using gcc version 3.4.3 on Solaris 10. The library libstdc++.so.6
> is pointing to libstdc++.so.6.0.3.
>
> Can anyone please point out the reason for the error?
> Thank You.
> Sanjib.