Crate num_order

num-order implements numerically consistent Eq, Ord and Hash for various num types.

use std::cmp::Ordering;
use std::hash::Hasher;
use std::collections::hash_map::DefaultHasher;
use num_order::NumOrd;

assert!(NumOrd::num_eq(&3u64, &3.0f32));
assert!(NumOrd::num_lt(&-4.7f64, &-4i8));
assert!(!NumOrd::num_ge(&-3i8, &1u16));

// 40_000_000 can be exactly represented in f32, 40_000_001 cannot
// 40_000_001 becames 40_000_000.0 in f32
assert_eq!(NumOrd::num_cmp(&40_000_000f32, &40_000_000u32), Ordering::Equal);
assert_ne!(NumOrd::num_cmp(&40_000_001f32, &40_000_001u32), Ordering::Equal);
assert_eq!(NumOrd::num_partial_cmp(&f32::NAN, &40_000_002u32), None);

use num_order::NumHash;
// same hash values are guaranteed for equal numbers
let mut hasher1 = DefaultHasher::new();
3u64.num_hash(&mut hasher1);
let mut hasher2 = DefaultHasher::new();
3.0f32.num_hash(&mut hasher2);
assert_eq!(hasher1.finish(), hasher2.finish())

This crate can serve applications where float-ord, num-cmp, num-ord are used. Meanwhile it also supports hashing and more numeric types (num-bigint, etc.).

Optional Features

• std: enable std library
• num-bigint: Support comparing against and hashing num-bigint::{BigInt, BigUint}
• num-rational: Support comparing against and hashing num-rational::Ratio<I>, where I can be i8, i16, i32, i64, i128 and isize. Ratio<BigInt> is supported when both num-bigint and num-rational is enabled
• num-complex: Support comparing against and hashing num-complex::{Complex32, Complex64}

Traits

• NumHash
  Consistent hash implementation among different numeric types.
• NumOrd
  Consistent comparison among different numeric types.