Crate rugint

Arbitrary-precision integers

The rugint crate provides arbitrary-precision integers using the GNU Multiple Precision Arithmetic Library (GMP). It can be helpful to refer to the documentation at the GMP page.

This crate is free software: you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

This crate is one of a group of four crates:

• rugint for arbitrary-precision integers,
• rugrat for arbitrary-precision rational numbers,
• rugflo for multiple-precision floating-point numbers, and
• rugcom for multiple-precision complex numbers.

Basic use

The crate provides the Integer type, which holds an arbitrary-precision integer. You can construct this from primitive data types, and use the standard arithmetic operators. Many operators can also operate on a mixture of this type and primitive types; in this case, the result is returned as an arbitrary-precision type.

Examples

use rugint::{Assign, Integer};
// Create an integer initialized as zero.
let mut int = Integer::new();
assert!(int.to_u32() == 0);
assert!(int == 0);
int.assign(14);
assert!(int == 14);

Arithmetic operations with mixed arbitrary and primitive types are allowed. However, the supported operations are not exhaustive.

use rugint::Integer;
let mut a = Integer::from(0xc);
a = (a << 80) + 0xffee;
assert!(a.to_string_radix(16) == "c0000000000000000ffee");
//                                 ^   ^   ^   ^   ^
//                                80  64  48  32  16

Note that in the above example, there is only one construction. The Integer instance is moved into the shift operation so that the result can be stored in the same instance, then that result is similarly consumed by the addition operation.

Usage

To use rugint in your crate, add extern crate rugint; to the crate root and add rugint as a dependency in Cargo.toml:

[dependencies]
rugint = "0.1.3"

The rugint crate depends on the low-level bindings in the gmp-mpfr-sys crate. This should be transparent on GNU/Linux and macOS, but may need some work on Windows. See the gmp-mpfr-sys README for some details.

Optional feature

The rugint crate has an optional feature random to enable random number generation. The random feature has a build dependency on the rand crate. The feature is enabled by default; to disable it add this to Cargo.toml:

[dependencies.rugint]
version = "0.1.3"
default-features = false

Structs

Integer

An arbitrary-precision integer.

Traits

Assign	Assigns to a number from another value.
DivFromAssign	Divide and assign the result to the rhs operand.
NegAssign	Negates the value inside self.
NotAssign	Peforms a bitwise complement of the value inside self.
Pow	Provides the power operation.
PowAssign	Provides the power operation inside self.
SubFromAssign	Subtract and assigns the result to the rhs operand.