Fraction

Lossless float that may be used in matching, ordering and hashing

More documentation available on docs.rs.

• The main goal of Fraction is to keep precision that floats cannot do
• Fractions can be used for matching and comparisons and thus for hashing
• Base arithmetic implemented upon num crate (rational module)
• Fraction struct implementation uses two u64 numbers and arithmetic on stack
• BigFraction struct implementation uses two limitless BigUint numbers and arithmetic on heap

Examples

Simple arithmetic

```rust use fraction::Fraction;

fn main () { let mut fr = Fraction::zero ();

fr = fr + Fraction::from (2); // 0 + 2 = 2 fr = fr / Fraction::from (0.5); // 2 / 0.5 = 4

asserteq! (fr, Fraction::from (4)); asserteq! (4.0f64, fr.to_f64 ()); } ```

Using as keys for a HashMap

```rust use std::collections::HashMap; use fraction::Fraction;

fn main () { let f = Fraction::from (0.75);

let mut map: HashMap

map.insert (f, ());

assert! (map.containskey (&Fraction::new (3u64, 4u64))); // 0.75 == 3/4 assert! (map.containskey (&Fraction::new (6u64, 8u64))); // 0.75 == 6/8 assert! (map.containskey (&Fraction::new (12u64, 16u64))); // 0.75 == 12/16 assert! (! map.containskey (&Fraction::from (0.5))); // 0.75 != 1/2 } ```

Comparison

```rust use fraction::Fraction;

fn main () { let f14 = Fraction::new (1u64, 4u64); // 1/4 == 0.25 let f12 = Fraction::new (1u64, 2u64); // 1/2 == 0.50 let f24 = Fraction::new (2u64, 4u64); // 2/4 == 0.50 let f34 = Fraction::new (3u64, 4u64); // 3/4 == 0.75

asserteq! (f12, f24); // 1/2 == 2/4 asserteq! (f34, f12 + f14); // 3/4 == 1/2 + 1/4 assert_eq! (f14, Fraction::from (0.25)); // 1/4 == 0.25 } ```

Change Log

Look into CHANGELOG.md for details