Crate gmp_mpfr [−] [src]

Rust bindings for GMP and MPFR

The gmp_mpfr crate uses the GNU Multiple Precision Arithmetic Library (GMP), for integer and rational numbers. The GNU MPFR Library, a library for multiple-precision floating-point computations, is used for floating-point numbers.

To understand the exact operation of the functions in this crate, you can see the online documentation available at the GMP and MPFR pages.

Just like GMP and MPFR, this crate is free software: you can redistribute it and/or modify it under the terms of either

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, or
the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

Basic use

There are three main types defined in this crate:

Integer which holds an arbitrary precision integer,
Rational which holds an arbitrary precision rational number, and
Float which holds a floating-point number with an exact precision.

You can construct these types from primitive data types. The standard arithmetic operators work on these types. Operators can also operate on these types and primitive types; in this case, the result is returned as an arbitrary precision type.

Examples

You can construct arbitrary precision types from primitive types:

use gmp_mpfr::{Integer, Rational, Float};
use gmp_mpfr::{FromPrec, Prec};

// Create an integer initialized as zero.
let int = Integer::new();
// Create a rational number, -22 / 4.
let rat = Rational::from((-22, 4));
// Create floating-point number with 16 bits of precision.
let flo = Float::from_prec(0xff00ff, Prec::from(16));

assert!(int.to_u32() == 0);
assert!(int == 0);
assert!(rat.numerator().to_i32() == -11);
assert!(rat.denominator().to_i32() == 2);
assert!(rat.to_f32() == -5.5);
assert!(flo.to_f64() == 0xff0100 as f64);

Arithmetic operations with mixed arbitrary and primitive types are allowed.

use gmp_mpfr::Integer;

let mut a = Integer::from(0xc);
a = (a << 80) + 0xffee;
assert!(a.to_string(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.

Structs

Exp	The type of the exponent of a `Float` value.
Float	A multi-precision floating-point number. The precision has to be set during construction.
Integer	`Integer` holds an arbitrary-precision integer. Standard arithmetic operations, bitwise operations and comparisons are supported. In standard arithmetic operations such as addition, you can mix `Integer` and primitive integer types; the result will be an `Integer`.
Prec	The type of the precision of a `Float` value.
Rational	An arbitrary-precision rational number.

Enums

Constant	The available floating-point constants.
Round	The rounding methods for floating-point values.
Special	Special floating-point values.

Traits

AddRound	Provides addition with a specified rounding method.
Assign	Assigns to a number from another value.
AssignRound	Assigns to a number from another value, applying the specified rounding method.
DivRound	Provides division with a specified rounding method.
FromPrec	Construct `Self` via a conversion with a specified precision.
FromPrecRound	Construct `Self` via a conversion with a specified precision, applying the specified rounding method.
MulRound	Provides multiplication with a specified rounding method.
NegAssign	Negates the value inside `self`.
NegRound	Provides negation with a specified rounding method.
Pow	Provides the power operation.
PowAssign	Provides the power operation inside `self`.
PowRound	Provides the power operation inside `self` with a specified rounding method.
ShlRound	Provides the left shift operation with a specified rounding method.
ShrRound	Provides the right shift operation with a specified rounding method.
SubRound	Provides subtraction with a specified rounding method.