Re:Go generics are not bad
by aw1621107 on Friday July 08, 2022 @10:49PM
(#32031007)
> Where is `zero()` defined?
It's defined by whatever implements the interface.
> Why does a `Numeric` have a function to `add` two numbers?
Because Java doesn't have user-defined operator overloading, so if you want to add stuff in a generic fashion you can't rely on `+`.
> Shouldn't you add a single number to a numeric? What is the relationship between `<T>` and `Numeric<T>`? I thought `T` was a `Numeric`?
`Numeric` doesn't contain data, it just defines operations on numbers. So `Numeric<Integer>` would define operations on `int`s, `Numeric<BigInteger>` would define operations on `BigInteger`s, etc.
It's defined by whatever implements the interface.
> Why does a `Numeric` have a function to `add` two numbers?
Because Java doesn't have user-defined operator overloading, so if you want to add stuff in a generic fashion you can't rely on `+`.
> Shouldn't you add a single number to a numeric? What is the relationship between `<T>` and `Numeric<T>`? I thought `T` was a `Numeric`?
`Numeric` doesn't contain data, it just defines operations on numbers. So `Numeric<Integer>` would define operations on `int`s, `Numeric<BigInteger>` would define operations on `BigInteger`s, etc.