30 lines
912 B
GDScript3
30 lines
912 B
GDScript3
|
extends RefCounted
|
||
|
|
class_name LockGuard
|
||
|
|
|
||
|
|
## A basic lock guard based on [b]RAII[/b] principle.
|
||
|
|
##
|
||
|
|
## I had been unable to pull this off. Because it frustrates me to replace all
|
||
|
|
## [method LockBase.lock] and [method LockBase.unlock] calls with this, I will
|
||
|
|
## explain why: When I started to develop [b]GodotRx[/b] I ran into a problem:
|
||
|
|
## The NOTIFICATION_PREDELETE is received, when the [b]self[/b] reference
|
||
|
|
## already results in a [b]null[/b]-value. I will now use the approach from
|
||
|
|
## [b]std::enable_shared_from_this[/b] using an uncounted reference as member.
|
||
|
|
## This appears to work as intended.
|
||
|
|
##
|
||
|
|
## Also, I learned a lot of C++ practices when creating NativeGodotRx ;)
|
||
|
|
|
||
|
|
var this : LockGuard
|
||
|
|
|
||
|
|
var _lock : LockBase
|
||
|
|
|
||
|
|
func _init(lock : LockBase):
|
||
|
|
this = self
|
||
|
|
this.unreference()
|
||
|
|
|
||
|
|
self._lock = lock
|
||
|
|
self._lock.lock()
|
||
|
|
|
||
|
|
func _notification(what):
|
||
|
|
if what == NOTIFICATION_PREDELETE:
|
||
|
|
this._lock.unlock()
|