partially 0.2.1

Provides the Partial trait, and an optional macro to mirror a struct, wrapping each field in an Option
Documentation 
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use partially::Partial;

#[derive(Partial)]
#[partially(derive(Default))]
struct Data {
    a: String,
    b: String,
}

#[test]
fn basic_apply_some() {
    let empty_partial = PartialData::default();
    let full_partial = PartialData {
        a: Some("modified".to_string()),
        b: None,
    };

    let mut full = Data {
        a: "initial".to_string(),
        b: String::default(),
    };

    assert!(!full.apply_some(empty_partial));

    assert_eq!(full.a, "initial".to_string());

    assert!(full.apply_some(full_partial));

    assert_eq!(full.a, "modified".to_string());
}

#[test]
fn partial_apply_some() {
    let mut empty_partial = PartialData::default();
    let full_partial = PartialData {
        a: Some("modified".to_string()),
        b: None,
    };

    assert!(empty_partial.apply_some(full_partial));

    assert_eq!(empty_partial.a, Some("modified".to_string()));
    assert_eq!(empty_partial.b, None);
}