const-struct-version 0.2.0

A trait plus proc-macro to generate a hash based on the fields of a struct. Useful for intelligently expiring a cache when the stored object changes.
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27

#![allow(dead_code)]

use const_struct_version::StructVersion;

#[derive(StructVersion)]
enum EnumTupleVariants {
    A(u32),
    B(f32),
}

#[derive(StructVersion)]
enum EnumTupleVariants2 {
    B(f32),
    A(u32),
}

#[test]
fn test_enum_ordering_changes_hash() {
    let version = <EnumTupleVariants as StructVersion>::version();
    let version2 = <EnumTupleVariants2 as StructVersion>::version();

    insta::assert_debug_snapshot!(version);
    insta::assert_debug_snapshot!(version2);

    // Ensure all are different.
    assert_ne!(version, version2);
}