A good example for overloading are set operations, because the logic is "compatible".

I don't see how the logic is compatible, unary - as complement means X - Y is different from X + (-Y). And there's just no relation between * and + anymore. At least with + for concatenation (which I already don't like much), you can have STRING * 3 to be equivalent to STRING + STRING + STRING.

And actually now that I think of it, the best operator to overload to append to a file is .=. With the dot you have both the append and string semantic, and the = makes it ok for the operation to have an effect on the left operand. And it makes chaining more consistent:
file("path") .= "First string" . "Second string";

In reply to Re^8: Split tab-separated file into separate files, based on column name ( Operator overloading ) by Eily
in thread Split tab-separated file into separate files, based on column name by Anonymous Monk

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