Module extension_trait

A macro for defining extension methods on external types.

• Crate ::extension_trait.
• docs.rs
• crates.io
• GitHub

extension_trait provides the extension_trait attribute macro, which generates a trait and its implementation from a single impl block. This is the standard Rust pattern for adding methods to types defined in other crates, but without the boilerplate of writing a matching trait definition by hand.

Example

use extension_trait::extension_trait;

#[extension_trait]
pub impl IntExt for i32 {
    fn is_even(&self) -> bool {
        self % 2 == 0
    }

    fn double(&self) -> i32 {
        self * 2
    }
}

assert!(4.is_even());
assert_eq!(3.double(), 6);