heaparray 0.1.6

use crate::naive_rc::prelude::*;

type PtrType<'a, E, L> = FatPtrArray<'a, E, RcStruct<L>>;
type DataType<'a, E, L> = ManuallyDrop<PtrType<'a, E, L>>;

pub struct FpRcArray<'a, E, L = ()> {
    data: DataType<'a, E, L>,
}

impl<'a, E> FpRcArray<'a, E> {
    /// Create a new reference-counted array, with values initialized using a provided function.
    #[inline]
    pub fn new<F>(len: usize, mut func: F) -> Self
    where
        F: FnMut(usize) -> E,
    {
        Self::new_labelled((), len, |_, idx| func(idx))
    }
}

impl<'a, E, L> FpRcArray<'a, E, L> {
    /// Create a new reference-counted array, with values initialized using a provided function, and label
    /// initialized to a provided value.
    #[inline]
    pub fn new_labelled<F>(label: L, len: usize, mut func: F) -> Self
    where
        F: FnMut(&mut L, usize) -> E,
    {
        let new_ptr = PtrType::new_labelled(RcStruct::new(label), len, |rc_struct, idx| {
            func(&mut rc_struct.data, idx)
        });
        Self {
            data: ManuallyDrop::new(new_ptr),
        }
    }

    /// Create a new reference-counted array, without initializing the values in it.
    #[inline]
    pub unsafe fn new_labelled_unsafe(label: L, len: usize) -> Self {
        let new_ptr = PtrType::new_labelled_unsafe(RcStruct::new(label), len);

        Self {
            data: ManuallyDrop::new(new_ptr),
        }
    }

    /// Unsafe access to an element at an index in the array.
    #[inline]
    pub unsafe fn unchecked_access(&'a self, idx: usize) -> &'a mut E {
        self.data.unchecked_access(idx)
    }
}

impl<'a, E> FpRcArray<'a, E>
where
    E: Default,
{
    /// Get a new reference-counted array, initialized to default values.
    #[inline]
    pub fn new_default(len: usize) -> Self {
        Self::new_default_labelled((), len)
    }
}

impl<'a, E, L> FpRcArray<'a, E, L>
where
    E: Default,
{
    /// Get a new reference-counted array, initialized to default values.
    #[inline]
    pub fn new_default_labelled(label: L, len: usize) -> Self {
        Self {
            data: ManuallyDrop::new(FatPtrArray::new_default_labelled(RcStruct::new(label), len)),
        }
    }
}

impl<'a, E, L> Index<usize> for FpRcArray<'a, E, L> {
    type Output = E;
    #[inline]
    fn index(&self, idx: usize) -> &E {
        &self.data[idx]
    }
}

impl<'a, E, L> IndexMut<usize> for FpRcArray<'a, E, L> {
    #[inline]
    fn index_mut(&mut self, idx: usize) -> &mut E {
        &mut self.data[idx]
    }
}

impl<'a, E, L> Clone for FpRcArray<'a, E, L> {
    #[inline]
    fn clone(&self) -> Self {
        #[cfg(test)]
        println!("heaparray::naive_rc::FpRcArray called self.clone()");
        (*self.data).get_label().increment();
        unsafe { std::mem::transmute_copy(self) }
    }
}

impl<'a, E, L> Drop for FpRcArray<'a, E, L> {
    fn drop(&mut self) {
        let ref_count = self.data.get_label_mut().decrement();

        if ref_count == 0 {
            #[cfg(test)]
            println!("heaparray::naive_rc::FpRcArray called self.drop()");

            let to_drop: PtrType<'a, E, L> = unsafe { std::mem::transmute_copy(&*self.data) };
            std::mem::drop(to_drop);
        }
    }
}

impl<'a, E, L> Container<(usize, E)> for FpRcArray<'a, E, L> {
    #[inline]
    fn add(&mut self, elem: (usize, E)) {
        self[elem.0] = elem.1;
    }
    #[inline]
    fn len(&self) -> usize {
        self.data.len()
    }
}

impl<'a, E, L> CopyMap<'a, usize, E> for FpRcArray<'a, E, L>
where
    E: 'a,
{
    #[inline]
    fn get(&'a self, key: usize) -> Option<&'a E> {
        if key > self.len() {
            None
        } else {
            Some(&self[key])
        }
    }
    #[inline]
    fn get_mut(&'a mut self, key: usize) -> Option<&'a mut E> {
        if key > self.len() {
            None
        } else {
            Some(&mut self[key])
        }
    }
    #[inline]
    fn insert(&mut self, key: usize, value: E) -> Option<E> {
        if key > self.len() {
            None
        } else {
            Some(std::mem::replace(&mut self[key], value))
        }
    }
}

impl<'a, E, L> Array<'a, E> for FpRcArray<'a, E, L> where E: 'a {}

impl<'a, E, L> LabelledArray<'a, E, L> for FpRcArray<'a, E, L>
where
    E: 'a,
{
    /// Get a reference to the label of the array.
    #[inline]
    fn get_label(&self) -> &L {
        &self.data.get_label().data
    }

    /// Get a mutable reference to the label of the array.
    #[inline]
    fn get_label_mut(&mut self) -> &mut L {
        &mut self.data.get_label_mut().data
    }
}