has-some-field

Check whether a struct has any field that is_some().

Usage

Use the HasSomeField derive macro on a struct with optional fields.

• has_some_field() - Returns whether any of the fields is_some().
• some_field_count() - Returns the number of optional fields that is_some().

Example

#[derive(HasSomeField)]
struct TestStruct {
    a: Option<u8>,
    b: Option<u8>,
}

let test_struct = TestStruct {
    a: Some(5),
    b: Some(5),
};
assert_eq!(test_struct.some_field_count(), 2);

let test_struct = TestStruct { a: None, b: None };
assert!(!test_struct.has_some_field());

let test_struct = TestStruct {
    a: Some(5),
    b: None,
};
assert!(test_struct.has_some_field());

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.