icodein / default_macro

Default macro for Rust

default! macro for Rust

Sometimes you want to create nested structures, set values for some the fields and use default value for most of the other, for example:

use default_macro::default;

#[derive(Default)]
struct Window { title: &str, border: Border, /* 10 other fields */ }

#[derive(Default)]
struct Border { width: f64, /* 5 other fields*/ }

fn foo() {
    let w1 = Window { 
        title: "Test", 
        border: Border {  
            width: 10.0, 
            ..Border::Default}, 
        ..Window::default()
    };

    // with the macros:
    let w2 = default!( Window { 
        title: "Test", 
        border: Border {  width: 10.0} 
    });
}