composable-allocators 0.1.6

Composable memory allocators for new allocator API.
Documentation 
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use crate::base::*;
use ::alloc::alloc::{self, AllocError, Allocator};
use core::ptr::NonNull;

#[derive(Debug, Copy, Clone)]
pub struct Global;

impl const Default for Global {
    fn default() -> Self { Global }
}

unsafe impl NonUnwinding for Global { }

unsafe impl Allocator for Global {
    fn allocate(&self, layout: alloc::Layout) -> Result<NonNull<[u8]>, AllocError> {
        alloc::Global.allocate(layout)
    }

    fn allocate_zeroed(&self, layout: alloc::Layout) -> Result<NonNull<[u8]>, AllocError> {
        alloc::Global.allocate_zeroed(layout)
    }

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

    unsafe fn grow(
        &self, 
        ptr: NonNull<u8>, 
        old_layout: alloc::Layout, 
        new_layout: alloc::Layout
    ) -> Result<NonNull<[u8]>, AllocError> {
        alloc::Global.grow(ptr, old_layout, new_layout)
    }

    unsafe fn grow_zeroed(
        &self, 
        ptr: NonNull<u8>, 
        old_layout: alloc::Layout, 
        new_layout: alloc::Layout
    ) -> Result<NonNull<[u8]>, AllocError> {
        alloc::Global.grow_zeroed(ptr, old_layout, new_layout)
    }

    unsafe fn shrink(
        &self, 
        ptr: NonNull<u8>, 
        old_layout: alloc::Layout, 
        new_layout: alloc::Layout
    ) -> Result<NonNull<[u8]>, AllocError> {
        alloc::Global.shrink(ptr, old_layout, new_layout)
    }
}