Popular recipes tagged "overloading"

Roman numeral class with overloaded int methods (Python)

2011-04-06T14:52:06-07:00

Python recipe 577640 by thom neale (homework, int, overloading, python, roman).

This Roman class is a subclass of int and supports the same methods int does, but any special methods that would normally return ints are return a new instance of Roman. You can use instances of this class in math expressions and a Roman instance will be returned, for example.

The class decorator used to achieve this was suggested by Alex Martelli 'here on stackoverlow.com.

Simple Function Overloading with Decorator (Python)

2010-04-06T00:59:52-07:00

Python recipe 577064 by Ryan Lie (decorator, function, overloading, python). Revision 3.

The recipe presents a simple decorator for function overloading in python. The @overloaded function searches for the first overloads that doesn't raise TypeError when called. Overloads are added to the overloads list by using the @func.overload_with decorator. The order of function definition determines which function gets tried first and once it founds a compatible function, it skips the rest of the overloads list.

Type-Checking Function Overloading Decorator (Python)

2010-04-11T11:16:48-07:00

Python recipe 577065 by Ryan Lie (checkng, decorator, function, overloading, python, type). Revision 2.

The recipe presents a function overloading decorator in python that do type check. The type signature is marked with the @takes and @returns decorator, which causes the function to raise an InputParameterError exception if called with inappropriate arguments. The @overloaded function searches for the first overloads that doesn't raise TypeError or InputParameterError when called. Alternative overloads are added to the overloads list by using the @func.overload_with decorator. The order of function definition determines which function gets tried first and once it founds a compatible function, it skips the rest of the overloads list.