| # num-bigint |
| |
| [](https://crates.io/crates/num-bigint) |
| [](https://docs.rs/num-bigint) |
| [](https://rust-lang.github.io/rfcs/2495-min-rust-version.html) |
| [](https://github.com/rust-num/num-bigint/actions) |
| |
| Big integer types for Rust, `BigInt` and `BigUint`. |
| |
| ## Usage |
| |
| Add this to your `Cargo.toml`: |
| |
| ```toml |
| [dependencies] |
| num-bigint = "0.4" |
| ``` |
| |
| ## Features |
| |
| The `std` crate feature is enabled by default, and is mandatory before Rust |
| 1.36 and the stabilized `alloc` crate. If you depend on `num-bigint` with |
| `default-features = false`, you must manually enable the `std` feature yourself |
| if your compiler is not new enough. |
| |
| ### Random Generation |
| |
| `num-bigint` supports the generation of random big integers when the `rand` |
| feature is enabled. To enable it include rand as |
| |
| ```toml |
| rand = "0.8" |
| num-bigint = { version = "0.4", features = ["rand"] } |
| ``` |
| |
| Note that you must use the version of `rand` that `num-bigint` is compatible |
| with: `0.8`. |
| |
| ## Releases |
| |
| Release notes are available in [RELEASES.md](RELEASES.md). |
| |
| ## Compatibility |
| |
| The `num-bigint` crate is tested for rustc 1.31 and greater. |
| |
| ## Alternatives |
| |
| While `num-bigint` strives for good performance in pure Rust code, other |
| crates may offer better performance with different trade-offs. The following |
| table offers a brief comparison to a few alternatives. |
| |
| | Crate | License | Min rustc | Implementation | Features | |
| | :--------------- | :------------- | :-------- | :------------- | :------- | |
| | **`num-bigint`** | MIT/Apache-2.0 | 1.31 | pure rust | dynamic width, number theoretical functions | |
| | [`awint`] | MIT/Apache-2.0 | 1.66 | pure rust | fixed width, heap or stack, concatenation macros | |
| | [`bnum`] | MIT/Apache-2.0 | 1.61 | pure rust | fixed width, parity with Rust primitives including floats | |
| | [`crypto-bigint`] | MIT/Apache-2.0 | 1.57 | pure rust | fixed width, stack only | |
| | [`ibig`] | MIT/Apache-2.0 | 1.49 | pure rust | dynamic width, number theoretical functions | |
| | [`rug`] | LGPL-3.0+ | 1.65 | bundles [GMP] via [`gmp-mpfr-sys`] | all the features of GMP, MPFR, and MPC | |
| |
| [`awint`]: https://crates.io/crates/awint |
| [`bnum`]: https://crates.io/crates/bnum |
| [`crypto-bigint`]: https://crates.io/crates/crypto-bigint |
| [`ibig`]: https://crates.io/crates/ibig |
| [`rug`]: https://crates.io/crates/rug |
| |
| [GMP]: https://gmplib.org/ |
| [`gmp-mpfr-sys`]: https://crates.io/crates/gmp-mpfr-sys |
| |
| ## License |
| |
| Licensed under either of |
| |
| * [Apache License, Version 2.0](http://www.apache.org/licenses/LICENSE-2.0) |
| * [MIT license](http://opensource.org/licenses/MIT) |
| |
| at your option. |
| |
| ### Contribution |
| |
| Unless you explicitly state otherwise, any contribution intentionally submitted |
| for inclusion in the work by you, as defined in the Apache-2.0 license, shall be |
| dual licensed as above, without any additional terms or conditions. |
