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 _______________________________________________ GiNaC-list mailing list GiNaC-list@ginac.de https://www.ginac.de/mailman/listinfo/ginac-list

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GiNaC-list mailing list GiNaC-list@ginac.de https://www.ginac.de/mailman/listinfo/ginac-list

Greetings to all. I would like to briefly correct some code I posted to this list where I used "idx" as the name of an iterator. I had not realized that this was one of the built-in classes, which could cause confusion. I will be alert to this in the future. I was able to resolve all my other problems and I now have a working program, part of a series I plan to write. I must say I am very favourably impressed with the speed of my program, it is easily as fast as Maple if not better. I am new to C++ but I have some experience with Objective C which helps with the general design paradigms. Best regards, Marko