gecko-dev/third_party/rust/num-bigint

num-bigint

Big integer types for Rust, BigInt and BigUint.

Usage

Add this to your Cargo.toml:

[dependencies]
num-bigint = "0.2"

and this to your crate root:

extern crate num_bigint;

Features

The std crate feature is mandatory and enabled by default. If you depend on num-bigint with default-features = false, you must manually enable the std feature yourself. In the future, we hope to support #![no_std] with the alloc crate when std is not enabled.

Implementations for i128 and u128 are only available with Rust 1.26 and later. The build script automatically detects this, but you can make it mandatory by enabling the i128 crate feature.

Releases

Release notes are available in RELEASES.md.

Compatibility

The num-bigint crate is tested for rustc 1.15 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
num-bigint	MIT/Apache-2.0	1.15	pure rust
ramp	Apache-2.0	nightly	rust and inline assembly
rug	LGPL-3.0+	1.31	bundles GMP via gmp-mpfr-sys
rust-gmp	MIT	stable?	links to GMP
apint	MIT/Apache-2.0	1.26	pure rust (unfinished)