# Simple Observable

## This simple library is made to notify you when your data changes

 Adding a dependency: `simple-observable = "0.2.2"`

## Changing observed values

```rust
use simple_observable::Observable;

fn main() {
    let a = 1;
    println!("Initial value: {}", a);
    let mut obs1 = Observable::new(a);
    obs1.add_listener(listener1);
    obs1.add_listener(listener2);
    obs1.add_listener(listener3);
    obs1.change(my_change_function);
}

fn my_change_function(num: &mut i32) {
    *num += 1;
}

fn listener1(num: &i32) {
    println!("(listener1) New value after change: {}", num);
}

fn listener2(num: &i32) {
    println!("(listener2) New value after change: {}", num);
}

fn listener3(num: &i32) {
    println!("(listener3) New value after change: {}", num);
}
```

`Observable` is a pointer that can be dereferenced and the data can be accessed directly. However, the data cannot be changed, but only read

It is important to understand that the `Observable` owns the data and the only way to change the data is to call the `change()` method.