Feature request: clearing lsts

Roberto Bagnara bagnara at cs.unipr.it
Fri Jan 18 22:41:28 CET 2002

I did not find in the documentation a way to erase all
the elements of an lst.  More formally, what is needed
is the functionality provided by, e.g.,

clear(GiNaC::lst& l) {
  for (unsigned n = l.nops(); n-- > 0; )
  assert(l.nops() == 0);

Something like that turns out to be very useful in several
situations.  For an example, consider the following:

    if (match(e, pattern_1, substitution))
    else if (clear(substitution), match(e, pattern_2, substitution))
    else if (clear(substitution), match(e, pattern_3, substitution))

Please, consider the addition of such a method to GiNaC::lst.
You may not want to call it clear() though, as this is perhaps too
STL-ish (someone may be induced to think that lst is an STL container
and we do not want that ;-)
All the best


Prof. Roberto Bagnara
Computer Science Group
Department of Mathematics, University of Parma, Italy
mailto:bagnara at cs.unipr.it

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