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#![feature(allocator_api)]
#![feature(ptr_alignment_type)]
#![feature(btree_cursors)]
#![feature(slice_ptr_get)]
#![feature(layout_for_ptr)]
#![feature(btreemap_alloc)]
#![feature(const_alloc_layout)]
#![feature(mapped_lock_guards)]

use std::alloc::{AllocError, Allocator, Global, Layout};
use std::ptr::NonNull;
use std::rc::Rc;
use std::sync::Arc;

///
/// Implementation of a lockfree queue that is used by the allocators to recycle allocations
/// when accessed by multiple threads.
/// 
mod lockfree;
///
/// Implementation of a memory pool supporting only allocations of a fixed layout.
/// 
pub mod fixedsize;
///
/// Implementation of a memory pool supporting arbitrary allocations.
/// 
pub mod dynsize;

///
/// An [`Rc`] pointing to an [`Allocator`]. As opposed to `Rc<A>`, the type `AllocRc<A>`
/// implements again [`Allocator`].
/// 
pub struct AllocRc<A: Allocator, PtrAlloc: Allocator + Clone = Global>(pub Rc<A, PtrAlloc>);

impl<A: Allocator, PtrAlloc: Allocator + Clone> Clone for AllocRc<A, PtrAlloc> {

    fn clone(&self) -> Self {
        Self(self.0.clone())
    }
}

unsafe impl<A: Allocator, PtrAlloc: Allocator + Clone> Allocator for AllocRc<A, PtrAlloc> {

    fn allocate(&self, layout: Layout) -> Result<NonNull<[u8]>, AllocError> {
        (*self.0).allocate(layout)
    }

    unsafe fn deallocate(&self, ptr: NonNull<u8>, layout: Layout) {
        (*self.0).deallocate(ptr, layout)
    }
}

///
/// An [`Arc`] pointing to an [`Allocator`]. As opposed to `Arc<A>`, the type `AllocArc<A>`
/// implements again [`Allocator`].
/// 
pub struct AllocArc<A: Allocator, PtrAlloc: Allocator + Clone = Global>(pub Arc<A, PtrAlloc>);

unsafe impl<A: Allocator, PtrAlloc: Allocator + Clone> Allocator for AllocArc<A, PtrAlloc> {

    fn allocate(&self, layout: Layout) -> Result<NonNull<[u8]>, AllocError> {
        (*self.0).allocate(layout)
    }

    unsafe fn deallocate(&self, ptr: NonNull<u8>, layout: Layout) {
        (*self.0).deallocate(ptr, layout)
    }
}

impl<A: Allocator, PtrAlloc: Allocator + Clone> Clone for AllocArc<A, PtrAlloc> {
    
    fn clone(&self) -> Self {
        Self(self.0.clone())
    }
}