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Last update: 23/10/2026

string_cache_codegen

String interning for Rust

Latest version: 0.11.2 registry icon
Maintenance score
57
Safety score
100
Popularity score
43
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Security
  Vulnerabilities
Version Suggest Low Medium High Critical
0.11.2 0 0 0 0 0
0.11.1 0 0 0 0 0
0.11.0 0 0 0 0 0
0.7.0 0 0 0 0 0
0.6.1 0 0 0 0 0
0.6.0 0 0 0 0 0
0.5.4 0 0 0 0 0
0.5.3 0 0 0 0 0
0.5.2 0 0 0 0 0
0.5.1 0 0 0 0 0
0.5.0 0 0 0 0 0
0.4.4 0 0 0 0 0
0.4.2 0 0 0 0 0
0.4.1 0 0 0 0 0
0.4.0 0 0 0 0 0
0.3.1 0 0 0 0 0
0.3.0 0 0 0 0 0

Stability
Latest release:

0.11.2 - This version is safe to use because it has no known security vulnerabilities at this time. Find out if your coding project uses this component and get notified of any reported security vulnerabilities with Meterian-X Open Source Security Platform

Licensing

Maintain your licence declarations and avoid unwanted licences to protect your IP the way you intended.

MIT   -   MIT License

Not a wildcard

Not proprietary

OSI Compliant

Apache-2.0   -   Apache License 2.0

Not a wildcard

Not proprietary

OSI Compliant

string-cache

Build Status

Documentation

A string interning library for Rust, developed as part of the Servo project.

Simple usage

In Cargo.toml:

[dependencies]
string_cache = "0.11"

In lib.rs:

use string_cache::DefaultAtom as Atom;

With static atoms

In Cargo.toml, corresponding versions of the two crates must be used:

[package]
build = "build.rs"

[dependencies]
string_cache = "0.11"

[build-dependencies]
string_cache_codegen = "0.11"

In build.rs:

use std::env;
use std::path::Path;

fn main() {
    string_cache_codegen::AtomType::new("foo::FooAtom", "foo_atom!")
        .atoms(&["foo", "bar"])
        .write_to_file(&Path::new(&env::var("OUT_DIR").unwrap()).join("foo_atom.rs"))
        .unwrap()
}

In lib.rs:

mod foo {
    include!(concat!(env!("OUT_DIR"), "/foo_atom.rs"));
}

The generated code will define a FooAtom type and a foo_atom! macro. The macro can be used in expression or patterns, with strings listed in build.rs. For example:

fn compute_something(input: &foo::FooAtom) -> u32 {
    match *input {
        foo_atom!("foo") => 1,
        foo_atom!("bar") => 2,
        _ => 3,
    }
}