[GiNaC-list] type casting

[Marko Riedel]

Also, I found that exset is sufficient for my purposes, so that is one 
fewer type to implement.

Am 10.02.23 um 01:37 schrieb Marko Riedel:
> Never mind, I am still learning. I found the ex_to converter and now 
> everything is working.
> 
> Marko
> 
> Am 10.02.23 um 00:34 schrieb Marko Riedel:
>> Hi all,
>>
>> I have a set of custom objects that is declared like this:
>>
>>
>> struct cindsym_is_less {
>>          bool operator() (const cindsymbol &lh,
>>                           const cindsymbol &rh) const
>>    { return lh.compare(rh) < 0; }
>> };
>>
>> typedef std::set<cindsymbol, cindsym_is_less> cindsymset;
>>
>> Now I want to collect all custom objects that appear in an expression 
>> tree into this kind of set. I tried this:
>>
>> void indets_recurse(ex src, cindsymset & coll)
>> {
>>    if(is_a<add>(src) || is_a<mul>(src) || is_a<power>(src)){
>>      for(size_t idx = 0; idx < src.nops(); idx++)
>>        indets_recurse(src.op(idx), coll);
>>      return;
>>    }
>>
>>    if(is_a<cindsymbol>(src)){
>>      coll.insert(src);
>>    }
>> }
>>
>> However this will produce the error "no matching function call" 
>> because src is an expression and not a cindsymbol. I know that I have 
>> my kind of symbol because is_a<cindsymbol> returned true. How can I 
>> get at the symbol wrapped in the expression?
>>
>> Best regards,
>>
>> Marko
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