#enum #string #macros #proc-macros

macro strum_macros

Helpful macros for working with enums and strings

26 releases (16 breaking)

0.20.1 Nov 21, 2020
0.19.4 Oct 7, 2020
0.18.0 Mar 2, 2020
0.17.1 Dec 20, 2019
0.5.0 Feb 23, 2017

#19 in Procedural macros

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224,486 downloads per month
Used in 761 crates (244 directly)

MIT license

1.5K SLoC


Build Status Build status Latest Version Rust Documentation Crates.io Crates.io

Strum is a set of macros and traits for working with enums and strings easier in Rust.


Strum is compatible with versions of rustc >= 1.31.0. That's the earliest version of stable rust that supports impl trait. Pull Requests that improve compatibility with older versions are welcome, but new feature work will focus on the current version of rust with an effort to avoid breaking compatibility with older versions.

Including Strum in Your Project

Import strum and strum_macros into your project by adding the following lines to your Cargo.toml. Strum_macros contains the macros needed to derive all the traits in Strum.

strum = "0.20"
strum_macros = "0.20"

# You can also use the "derive" feature, and import the macros directly from "strum"
# strum = { version = "0.20", features = ["derive"] }

Strum Macros

Strum has implemented the following macros:

Macro Description
EnumString Converts strings to enum variants based on their name
Display Converts enum variants to strings
AsRefStr Converts enum variants to &'static str
IntoStaticStr Implements From<MyEnum> for &'static str on an enum
EnumVariantNames Adds an associated VARIANTS constant which is an array of discriminant names
EnumIter Creates a new type that iterates of the variants of an enum.
EnumProperty Add custom properties to enum variants.
EnumMessage Add a verbose message to an enum variant.
EnumDiscriminants Generate a new type with only the discriminant names.
EnumCount Add a constant usize equal to the number of variants.
ToString Serialize an enum to a String.


Thanks for your interest in contributing. The project is divided into 3 parts, the traits are in the /strum folder. The procedural macros are in the /strum_macros folder, and the integration tests are in /strum_tests. If you are adding additional features to strum or strum_macros, you should make sure to run the tests and add new integration tests to make sure the features work as expected.


To see the generated code, set the STRUM_DEBUG environment variable before compiling your code. STRUM_DEBUG=1 will dump all of the generated code for every type. STRUM_DEBUG=YourType will only dump the code generated on a type named YourType.


Strum is short for STRing enUM because it's a library for augmenting enums with additional information through strings.

Strumming is also a very whimsical motion, much like writing Rust code.


~26K SLoC