#default #syntax #initialization

default_is_triple_underscore

Shorter syntax for Default::default() : ___()

4 releases

0.2.0 Aug 5, 2024
0.1.2 Aug 5, 2024
0.1.1 Jul 5, 2024
0.1.0 Jul 5, 2024

#25 in #initialization

Download history 17/week @ 2024-07-11 186/week @ 2024-08-01 38/week @ 2024-08-08 3/week @ 2024-09-19 2/week @ 2024-09-26

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MIT OR Apache-2.0 OR MPL-2.0

5KB

A shorter way to write default. Provide :

  • ___() as a shorthand for Default::default()
  • i32::___() instead of i32::default()

Based on the internals Rust discussion

Also check the Defaults crate which use default() instead of Default::default()

Examples

let b : i32 = Default::default(); // Default Rust
let a : i32 = ___(); // Now
assert_eq!(a, b);

Can also be used with function :

let a = f(Default::default()); // Default Rust
let b = f(___()); // Now
assert_eq!(a, b);

Can also be used to initialize complex Rust struct when implementing the Default trait :

impl Default for ComplexeStruct {
    fn default() -> Self { 
    Self { a : ___(), b : ___(), c : ___(), vec : vec![0] }
    //  instead of
    // Self { a : Default::default(), b : Default::default(), c : Default::default(), vec : vec![0] }
    }
}

Uniform syntax : MyStruct::___() instead of MyStruct::default() :

type T = i32; // any type with default
assert_eq!(T::default(), T::___());

No runtime deps