is_empty

Easily check if the struct is empty.

Usage

use is_empty::IsEmpty;

#[derive(IsEmpty)]
struct Foo {
    a: Option<String>,
    b: Option<String>,
}

let foo = Foo {
    a: Some("a".to_string()),
    b: None,
};
assert!(!foo.is_empty());

let bar = Foo {
   a: None,
   b: None,
};
assert!(bar.is_empty());

Acknowledgements

This crate was made possible by the excellent blog series on derive macros by Jonas Platte.

License

Licensed under either of

• Apache License, Version 2.0 (LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0)
• MIT license (LICENSE-MIT or http://opensource.org/licenses/MIT)

at your option.

Contribution

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.