45 lines
911 B
Plaintext
45 lines
911 B
Plaintext
|
import mem:*
|
||
|
|
|
||
|
|
fun rc<T>(in:T):rc<T> {
|
||
|
|
var to_ret.construct(in): rc<T>
|
||
|
|
return to_ret
|
||
|
|
}
|
||
|
|
|
||
|
|
obj rc<T> (Object) {
|
||
|
|
var inner: *rc_inner<T>
|
||
|
|
fun construct(): *rc<T> {
|
||
|
|
inner = null<rc_inner<T>>()
|
||
|
|
return this
|
||
|
|
}
|
||
|
|
fun construct(data: ref T): *rc<T> {
|
||
|
|
inner = new<rc_inner<T>>()
|
||
|
|
inner->data.copy_construct(&data)
|
||
|
|
inner->count = 1
|
||
|
|
}
|
||
|
|
fun copy_construct(old: *rc<T>): void {
|
||
|
|
inner = old->inner
|
||
|
|
inner->count++;
|
||
|
|
}
|
||
|
|
fun operator=(other: ref rc<T>): void {
|
||
|
|
if other.inner != inner {
|
||
|
|
destruct()
|
||
|
|
copy_construct(&other)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
fun destruct(): void {
|
||
|
|
inner->count--;
|
||
|
|
if inner->count == 0 {
|
||
|
|
inner->data.destruct()
|
||
|
|
delete(inner)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
fun get(): ref T {
|
||
|
|
return inner->data
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
obj rc_inner<T> {
|
||
|
|
var count: int
|
||
|
|
var data: T
|
||
|
|
}
|