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#big-integer #integer-arithmetic #bignum #numeric

no-std num-bigint

Big integer implementation for Rust

by Josh Stone, The Rust Project Developers (99 contributors)

30 releases

0.4.6 Jun 27, 2024
0.4.4 Aug 22, 2023
0.4.3 Nov 3, 2021
0.4.0 Mar 5, 2021
0.1.33 Jul 12, 2016

#30 in Math

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8,139,838 downloads per month
Used in 9,681 crates (1,150 directly)

MIT/Apache

295KB
7.5K SLoC

num-bigint

crate documentation minimum rustc 1.60 build status

Big integer types for Rust, BigInt and BigUint.

Usage

Add this to your Cargo.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

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.

Compatibility

The num-bigint crate is tested for rustc 1.60 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 1.60 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 1.65 pure rust fixed width, parity with Rust primitives including floats
crypto-bigint MIT/Apache-2.0 1.73 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

License

Licensed under either of

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.

Dependencies

~140–610KB
~11K SLoC