Macro aoko::structs_default_decl

macro_rules! structs_default_decl {
    ($vis:vis struct $s_name:ident;) => { ... };
    ($(#[$attr:meta])* $vis:vis struct $name:ident $(<$($generic:tt),*>)? {
        $($field_vis:vis $field:ident: $type:ty = $val:expr),* $(,)?
    }
    $($tail:tt)*) => { ... };
    () => { ... };
}

Struct::default(): assigning user-defined values to fields directly.

Principles

Text replacement, automatic function generation.

Examples

use aoko::{structs_default_decl, assert_eqs};
 
structs_default_decl!(
    #[derive(Debug)]
    pub struct A<'a> {
        foo: u8 = 233,
        pub bar: &'a str = "abc",
    }
    struct B {}
    struct C;
);
 
assert_eqs!(
    233, A::default().foo;
    "abc", A::default().bar;
    "A { foo: 233, bar: \"abc\" }", format!("{:?}", A::default());
);