> Do you know a list of OO languages which have built in
> support for multiple-dispatch/multimethods?
>
> I know CLOS supports multimethod but others?
I don't know of such a list. I believe Dylan had them, and now Cecil.
My impression is that Cecil is probably the best example of a modern OO language,
though I have no idea of whether its really usable. See:
http://www.cs.washington.edu/research/projects/cecil
Here's a pointer to one of their papers about multimethods:
http://www.cs.washington.edu/research/projects/cecil/cecil/www/www/Papers/ecoop99.html
The lack of multimethods in C++ is irksome for me. Our newest compiler
framework resorts to stylized switch statements to get around the limitation.
E.g.:
bool Operand::is_assignable( const Operand& rhs ) const {
switch( kind() ) {
tree_AssertOperand:
tree_ControlOperand:
tree_LvalueOperand:
return is_assignable( rhs.type() );
default:
return false;
}
}
where the tree_* labels are macros that expand to case labels for whatever
classes are subclasses of *. It works, but it sure isn't OO.
Arch D. Robison Kuck & Associates Inc.
robison@kai.com 1906 Fox Drive
217-356-2288 ext. 56 Champaign IL 61820
Lead Developer for KAI C++ http://www.kai.com/C_plus_plus/index.html
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