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| Related articles |
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| optional parameters stefan.monnier@epfl.ch (Stefan Monnier) (1995-08-06) |
| Re: optional parameters markt@harlequin.co.uk (1995-08-10) |
| Re: optional parameters paulb@pablo.taligent.com (1995-08-15) |
| Re: optional parameters stachour@parka.winternet.com (1995-08-20) |
| Newsgroups: | comp.compilers |
| From: | Stefan Monnier <stefan.monnier@epfl.ch> |
| Keywords: | C++, design, Lisp, question, comment |
| Organization: | Ecole Polytechnique Federale de Lausanne |
| Date: | Sun, 6 Aug 1995 13:23:39 GMT |
How are optional parameters implemented ? I'm sure the technique is
not the same for C++ than for CommonLisp (and, for CommonLisp
&optional are probably not handled the same as &key and as &rest).
Is some special calling-convention used (with an arg count, for
instance) or are the missing optional parameters added by the
compiler thanks to prototype declarations ? How does it all fit with
the usual calling conventions ?
Stefan
[In C++ it's easy, since the compiler can tell what missing parameters to
add. Life in Lisp is more complex, since Lisp calls usually have to handle
closures and the like anyway. -John]
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