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Table of Contents
2. TMT Pascal Language Description
2.2. Pascal Language Structure
2.2.13. OOP Extensions
2.2.13.11. Desctructors
2.2.13.11. Destructors
Destructors are used to clean up after an object is no longer needed. Unlike
constructors, destructors can be virtual. Destruction of an object is often
combined with deallocation of its memory with the
Dispose procedure:
var
C: ^Circle;
begin
New(C);
C.Init(P,R);
...
C.Kill;
Dispose(C);
end;
If a constructor fails to perform initialization (often because of its
inability to allocate memory for the structures affiliated with the object,
it can execute a special system function Fail. Fail signals TMT
Pascal to reverse all allocation of the object that might have occurred and
return nil as the value of the object's pointer. Fail can be
called only within constructors.
See also:
Constructors
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