4 releases
Uses old Rust 2015
0.1.3 | Jun 26, 2018 |
---|---|
0.1.2 | May 8, 2018 |
0.1.1 | Apr 19, 2018 |
0.1.0 | Apr 19, 2018 |
#119 in #box
Used in boxext
4KB
Custom Derive for the boxext::Zero
trait
Add #[derive(Zero)]
on your types to automatically derive the boxext::Zero
trait.
Only structs aggregating types implementing the boxext::Zero
trait are valid to use this with.
Example
extern crate boxext;
#[macro_use]
extern crate boxext_derive;
use boxext::BoxExt;
#[derive(Zero)]
struct Foo {
a: usize,
b: f64,
c: [usize; 4],
}
// #[derive(Zero)]
// ^ the trait `boxext::Zero` is not implemented for `std::boxed::Box<Foo>`
// struct Bar {
// a: usize,
// b: Box<Foo>,
// }
fn main() {
// equivalent to Box::new(Foo { a: 0, b: 0.0, c: [0; 4] })
let buf: Box<Foo> = Box::new_zeroed();
}
Dependencies
~2MB
~47K SLoC