Re: [OT] Some neat ideas from the Kotlin language

[rsw0x via Digitalmars-d]

On Saturday, 20 February 2016 at 09:40:40 UTC, Tobias Müller 
wrote:
Yuxuan Shui <yshu...@gmail.com> wrote:
        [...]

In Rust that would be:

let var : Option<i32> = ...;
if let Some(var) = var {
    // You can use var here
}

It works for every enum (= tagged union), not just Option<T>

Swift also has "if let".

It's not much more verbose but more explicit.
Changing the type of a variable based on static analysis is 
just advanced
obfuscation. It hurts readability and the gain is questionable. 
At least it
only works for nullable types.

Tobi

D has this too, but only for nullable types afaik.

if(byte* ptr = someFunc()){
//...
}