use std::ops::{Deref, DerefMut};

pub struct MutDetect<T> {
    inner: T,
    pub changed: bool,
}

impl<T> Deref for MutDetect<T> {
    type Target = T;

    fn deref(&self) -> &Self::Target {
        &self.inner
    }
}

impl<T> DerefMut for MutDetect<T> {
    fn deref_mut(&mut self) -> &mut Self::Target {
        self.changed = true;
        &mut self.inner
    }
}

impl<T> From<T> for MutDetect<T> {
    fn from(inner: T) -> Self {
        MutDetect {
            inner,
            changed: true,
        }
    }
}