If a class defines a
finalize method, when an instance of that class is garbage-collected that method will be invoked:
class Foo def finalize # Invoked when Foo is garbage-collected # Use to release non-managed resources (ie. C libraries, structs) end end
Use this method to release resources allocated by external libraries that are not directly managed by Crystal garbage collector.
Examples of this can be found in
finalize method will only be invoked once the object has been fully initialized via the
initialize method. If an exception is raised inside the
finalize won't be invoked. If your class defines a
finalize method, be sure to catch any exceptions that might be raised in the
initialize methods and free resources.
Allocating any new object instances during garbage-collection might result in undefined behavior and most likely crashing your program.
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