Re: Operator overloading

On Sun, Mar 16, 2003 at 12:36:00PM +0000, Stefano Corsi wrote:
> Overloaded operators could be implemented as functions or methods that take 
> operands as parameters and return a value. 
> So we modify the code for M_FUNCTION_DECLARATION and M_FUNCTION_DECLARATOR 
> case labels in mxcg.c to set a proper function name in case the function or 
> method is an operator. Characters as "+ - += -= []" etc... should not be part 
> of a function name, so we have to find a sustitute name for them (plus, 
> minus, pluseq, etc...) We should modify also mfn_symbolName mfn.c for 
> handling operator functions and methods.

I like how Python handles this, with a special set of __*__ methods.  For
example, __add__() is used to create a '+' operator for an object, and __mul__
for mulitplication.  Here is an example:

  http://vsbabu.org/mt/archives/2002/02/20/sample_script_operator_overloading.html

Thats not a complete list, but I can't seem to find a good list anywhere on
the net of the special __*__ methods that Python lets you overload.

So to combine your suggestions there could be something like this:

  __plus__    +
  __minus__   -
  __equals__  ==
  __pluseq__  +=

Cory

--
Cory Wright
Stand Blue Technology
http://www.standblue.net/