Random Number

Generate random numbers quickly.

The random! Marco

```rust

[macrouse] extern crate randomnumber;

let n: u8 = random!(); println!("{}", n); // 0 ~ 255

let n: f64 = random!(); println!("{}", n); // 0.0 ~ 1.0

let n: u8 = random!(..=10); println!("{}", n); // 0 ~ 10

let n: u8 = random!(..=9); println!("{}", n); // 0 ~ 9

let n: u8 = random!(10..); println!("{}", n); // 10 ~ 255

let n: i8 = random!(-2..=12); println!("{}", n); // -2 ~ 12

let n: u8 = random!(12, 20); println!("{}", n); // 12 ~ 20

let n: u8 = random!(20, 12); println!("{}", n); // 12 ~ 20 ```

The random number generator can be reused by adding it to the random! macro as the last argument.

```rust

[macrouse] extern crate randomnumber;

let mut rng = randomnumber::rand::threadrng();

let n: u8 = random!(rng); println!("{}", n); // 0 ~ 255

let n: u8 = random!(..=10, rng); println!("{}", n); // 0 ~ 10

let n: u8 = random!(20, 12, rng); println!("{}", n); // 12 ~ 20 ```

The random_ranged Function

If the range is not literal, for example, a variable, var_range, storing an instance that implements the RangeBounds trait, the var_range variable cannot be used in the random! macro.

```rust

[macrouse] extern crate randomnumber;

let var_range = 1..=10;

let n: u8 = random!(var_range); // compile error ```

In this case, use the random_ranged function instead.

```rust extern crate random_number;

let var_range = 1..=10;

let n: u8 = randomnumber::randomranged(var_range); println!("{}", n); // 1 ~ 10 ```

The random_fill! Marco

The random_fill! marco can be used to fill a slice with random numbers. The usage is like the random! macro. Just add a slice as the first argument when using the random_fill! macro.

```rust

[macrouse] extern crate randomnumber;

let mut a = [0i8; 32]; random_fill!(a, -2..=12);

println!("{:?}", a); ```

The random_fill_ranged Function

```rust extern crate random_number;

let var_range = 1..=10;

let mut a = [0u8; 32]; randomnumber::randomfillranged(&mut a, varrange);

println!("{:?}", a); ```

Crates.io

https://crates.io/crates/random-number

Documentation

https://docs.rs/random-number

License

MIT