#default #pseudo #swap #uninitialized

macro no-std orx-pseudo-default-derive

Derives the PseudoDefault trait that allows to create a cheap default instance of a type, which does not claim to be useful

1 stable release

1.0.0 Aug 13, 2024

#8 in #uninitialized


Used in orx-pseudo-default

MIT license

6KB
73 lines

orx-pseudo-default-derive

orx-pseudo-default-derive crate orx-pseudo-default-derive documentation

Derives the PseudoDefault trait that allows to create a cheap default instance of a type, which does not claim to be useful.

Example

use orx_pseudo_default::PseudoDefault;
use orx_pseudo_default_derive::PseudoDefault;

#[derive(PseudoDefault)]
struct ChildStruct {
    a: String,
    b: char,
    c: Vec<u32>,
}

#[derive(PseudoDefault)]
struct MyStruct {
    x: ChildStruct,
    y: bool,
    z: Option<usize>,
}

assert_eq!(String::pseudo_default(), MyStruct::pseudo_default().x.a);
assert_eq!(char::pseudo_default(), MyStruct::pseudo_default().x.b);
assert_eq!(Vec::<u32>::pseudo_default(), MyStruct::pseudo_default().x.c);

assert_eq!(bool::pseudo_default(), MyStruct::pseudo_default().y);
assert_eq!(
    Option::<usize>::pseudo_default(),
    MyStruct::pseudo_default().z
);

Dependencies

~220–660KB
~16K SLoC