Re: Problem with Map Iterator

[Aseem Rastogi <aseem at india dot tejasnetworks dot com>]

could be because when u have erased the map node pointed to by iterMap, 
iterMap++ crashes as the memory location pointed to by iterMap becomes 
invalid.

so, instead of erasing in loop, do a clear () on map after the loop.

see inline.

hope this helps.

Sanjib Talukdar 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);             /////////   Remove this line
> 	   }

>>> call this->colDtlsByName.clear ();

> 	}
>
> 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.


--
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