polymorphism

A procedural macro to imitate ad hoc polymorphism (function overloading) which can be seen and found in many modern programming languages. Can be used similarly to an fn or impl declaration, but polymorphism allows for duplicate fn names with different signitures (types as parameters). This implementation of polymorphism bypasses the orphan rule with a Local type.

Example

polymorphism!(
    pub fn func(n: i32, m: i32) -> i32 {
        n+m
    }
    pub fn func(n: f64, m: f64) -> f64 {
        n-m
    }
);

assert_eq!(polymorphism!(func(1,2)), 3);
assert_eq!(polymorphism!(func(1.0,2.0)), -1.0);

Notes:

• This is a proof of concept, therefore it is REALLY unstable
• It is nearly untested and may break on edge cases
• Do NOT use it in production codebases at this time
• Feedback is appreciated :)