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C++ Discussion Thread
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Oct 9th, 2008

Accessing a list of Pointer

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Hi ,

I have a stl list which stores my base class pointer .Like

list<BaseClass*> eBList;

now i want to iterate through this list and store it in one local variable. how do i do this. i have shown below the code i tried .... But at one part it crashes..

C++ Syntax (Toggle Plain Text)
 list<BaseClass*>::const_iterator iter = eBList.begin( );
 
BaseClass *ebase
 
for( ; iter != eBList.end( ); iter++ )
    {
         if( typeid( **iter ) == typeid( DerivedClass ) )
         {
                   *ebase = **iter;    ///// CRASHES HERE    .. how do i assign to this variable      
                   break;     
           }
 
 
         }
 list<BaseClass*>::const_iterator iter = eBList.begin( );

BaseClass *ebase

for( ; iter != eBList.end( ); iter++ )
    {
         if( typeid( **iter ) == typeid( DerivedClass ) )
         {
                   *ebase = **iter;    ///// CRASHES HERE    .. how do i assign to this variable      
                   break;     
           }
              
              
         }

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Kamal_Java

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Oct 9th, 2008

Re: Accessing a list of Pointer

First you have to allocate memory for ebase -- you are dereferencing an unallocated pointer. So the best you can do with that is ebase = *iter;

Ancient Dragon

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Oct 9th, 2008

Re: Accessing a list of Pointer

yup! No doubt .. It will crash ..As ancient dragon said u have to put

Quote ...

ebase = *iter

Aashath

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