eager

Rust crate for simulating eager macro expansion.

Example

#[macro_use]
extern crate eager;

//Declare an eager macro
eager_macro_rules!{ $eager_1
    macro_rules! plus_1{
        ()=>{+ 1};
    }
}

fn main(){
	// Use the macro inside an eager! call to expand it eagerly
	assert_eq!(4, eager!{2 plus_1!() plus_1!()});
}

License

Licensed under the MIT license.

lib.rs:

This crate contians three macros used to simulate eager macro expansion:

1. eager!: Eagerly expands any macro in its body.
2. eager_macro_rules!: Used to declare macro that can be eagerly expanded with eager!.
3. lazy!: Used in eager! to revert to lazy macro expansion.

See the each macro's documentation for details.