[GiNaC-list] Getting a pointer to an element in a list?

[John Pye]

I want to update the expression from outisde the class, ie something like

ex &x = myobject->getExpression(17);
x = x.subs(y==5);

How would you suggest I did that? I think that a copy constructor is
getting called somewhere but I haven't worked out where yet.

Cheers

JP

Christian Bauer wrote:

>Hi!
>
>On Wed, Aug 17, 2005 at 01:25:16AM +1000, John Pye wrote:
>  
>
>>   const ex * getExpressionPtr(const unsigned &i) const{
>>      *return* &(F[i]);
>>   }
>>    
>>
>
>Hm, why do you want to do this? An 'ex' is already a pointer to something,
>so I don't see much advantage over
>
>  ex getExpression(unsigned i) const { return F[i]; }
>
>Bye,
>Christian
>
>  
>