One feature that I like a lot in Rust is return type polymorphism, best exemplified with the following snippet of code:
use std::collections::HashSet;
fn main() {
let vec: Vec<_> = (0..10).filter(|a| a % 2 == 0).collect();
let set: HashSet<_> = (0..10).filter(|a| a % 2 == 0).collect();
println!("vec: {:?}", vec);
println!("set: {:?}", set);
}
We have the same expression ((0..10).filter(|a| a % 2 == 0).collect()) that
results in two totally different types of values (a Vec and a HashSet)!
This is because Rust allows you to write a function which is generic in its return type, which is a super-power that C++ does not have. But is there a way to emulate this behaviour with some clever code?