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Date: Mon, 15 May 2006 13:22:00 -0000
From: Aseem Rastogi <aseem@india.tejasnetworks.com>
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To: Sanjib Talukdar <sanjibt@ascindia.com>
Cc: gcc-help@gcc.gnu.org
Subject: Re: Problem with Map Iterator
References: <E7DA15F84401D6448BEC01065CD94AA20168571B@mailserver.ascindia.com>
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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.
>


-- 
Nothing will work if u don't.