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use core::ptr;
use Void;
#[repr(C)]
pub struct HeapMem<T>(*mut T);
impl<T> HeapMem<T> {
#[inline(always)]
pub fn new(size: usize) -> HeapMem<T> {
if size == 0 {
return HeapMem(ptr::null_mut());
}
extern "C" {
fn malloc(n: usize) -> *mut Void;
}
unsafe { HeapMem(malloc(size) as *mut _) }
}
#[inline(always)]
pub fn from(x: T) -> HeapMem<T> {
let mut heap = HeapMem::new(1);
*heap = x;
heap
}
#[inline(always)]
pub fn resize(&mut self, size: usize) -> () {
if size == 0 {
panic!("Error: Can't call resize() when size == 0.");
}
extern "C" {
fn realloc(p: *mut Void, n: usize) -> *mut Void;
}
self.0 = unsafe { realloc(self.0 as *mut _, size) } as *mut _;
}
#[inline(always)]
pub fn as_ptr(&self) -> *const T {
self.0 as *const _
}
#[inline(always)]
pub fn as_mut_ptr(&self) -> *mut T {
self.0 as *mut _
}
#[inline(always)]
pub unsafe fn as_slice(&mut self, len: usize) -> &mut [T] {
::core::slice::from_raw_parts_mut(self.as_mut_ptr() as *mut _,
len)
}
}
impl<T> Drop for HeapMem<T> {
#[inline(always)]
fn drop(&mut self) -> () {
extern "C" {
fn free(p: *mut Void) -> ();
}
unsafe { free(self.0 as *mut _) };
}
}
impl<T> ::core::ops::Deref for HeapMem<T> {
type Target = T;
#[inline(always)]
fn deref(&self) -> &Self::Target {
unsafe { &*self.0 }
}
}
impl<T> ::core::ops::DerefMut for HeapMem<T> {
#[inline(always)]
fn deref_mut(&mut self) -> &mut Self::Target {
unsafe { &mut *self.0 }
}
}