3 ms·

(Assuming we are discussing the Option type from rust) Some(null) is not a valid result. The whole point of the Option type is to let you know: a) we got a r

(Assuming we are discussing the Option type from rust) Some(null) is not a valid result. The whole point of the Option type is to let you know: a) we got a result: Some(value) b) there is no result: None

andrewjf 5y ago
It's trivial to store a null pointer in an Option::Some(). struct Foo; fn main() { let option_with_null: Option<*const Foo> = Some(std::ptr::null()); dbg!(option_with_null); dbg!(option_with_null.is_none()); } Output: [src/main.rs:6] option_with_null = Some( 0x0000000000000000, ) [src/main.rs:7] option_with_null.is_none() = false https://play.rust-lang.org/?version=stable&mode=debug&edition=2021&gist=6b87832bf48f4115ae44504e497287c4 https://play.rust-lang.org/?version=stable&mode=debug&editio...
- alophawen 5y ago
  As the creator of the function, you should try to adhere to the conventions and not try to break them.
  - andrewjf 5y ago
    I don't disagree, but: > Some(null) is not a valid result. It is a valid result. Null pointer and Option::None are still different things, is all.