#enums #equality #macro-derive #derive #macro #partialeq

nightly macro varianteq

Derive the equality of enum variants ignoring fields

7 releases (4 breaking)

0.5.0 Feb 10, 2019
0.4.1 Jun 2, 2018
0.4.0 May 9, 2018
0.3.0 May 6, 2018
0.1.1 Apr 22, 2018

#1122 in Procedural macros

MIT license

6KB

VariantEq

Latest Version Rust Documentation Build Status

This crate provides a macro to implement equality of enum variants.

Two enum variants are equal if they are the same variant from the same enum, regardless of the values of the fields each variant contains.

#[derive(VariantEq)]
enum Enum {
    Variant,
}

Examples

#[macro_use]
extern crate varianteq;

#[derive(Debug, VariantEq)]
enum E {
    A(i32),
    B(i32),
    C(u32, bool),
}

fn main() {
    assert_eq!(E::A(1), E::A(2));
    assert_ne!(E::A(1), E::B(1));
    assert_ne!(E::A(1), E::C(1, false));
}

Errors

The VariantEq macro only applies to enums and will cauase a compilation error if used on structs.

#[derive(VariantEq)]
struct S;
error: #[derive(VariantEq)] is only defined for enums

Dependencies

~2MB
~47K SLoC