#newtype #wrapper #i32 #don-t #ownership #require #trapper

macro no-std trapper_macro

A proc-macro crate for easily building wrapper types with trapper

1 stable release

1.0.0 Aug 1, 2019

#56 in #ownership


Used in 2 crates (via trapper)

MIT license

5KB
65 lines

trapper

A simple Rust library for creating transparent newtypes that don't require ownership to be used.

Example

use trapper::{Wrapper, newtype};
newtype!(#[derive(PartialEq, Debug)] type NumberWrapper(i32));

fn foo(r: &i32, m: &mut i32) {
    let ref_wrapper: &NumberWrapper = NumberWrapper::wrap_ref(r);
    let mut_wrapper: &mut NumberWrapper = NumberWrapper::wrap_mut(m);
}

let mut wrapper = NumberWrapper::wrap(12);
*wrapper.unwrap_mut() = 13;

assert_eq!(wrapper, NumberWrapper::wrap(13));

Dependencies

~2MB
~46K SLoC