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/* could be non-null instead of raw pointer? */
typedef atomic_rc [t any] {
count *usize;
data *t;
}
/* macros must be 'called' with () */
pub define arc(t) { struct (atomic_rc[t]) };
pub dereference(a *arc) *#a.data
{
return a.t;
}
pub init(mut a *arc, e #a.data)
{
new(a.count, 0);
a.data = e;
}
pub init(mut a *arc, b *arc<#a.data>)
{
copy(a, b);
}
pub deinit(mut a *arc)
{
if atomic_fetch_add(a.count, -1) == 1 {
dealloc(a.data);
dealloc(a.count);
}
a.count = null;
a.data = null;
}
pub copy(mut a *arc, b *arc<#a.data>)
{
deinit(a);
a.count = b.count;
a.data = b.data;
atomic_fetch_add(b.count, 1);
}
pub move(mut a *arc, mut b *arc<#a.data>)
{
deinit(a);
a.count = b.count;
a.data = b.data;
/* reference count stays the same */
b.count = null;
a.count = null;
}
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