Returns the size in bytes of each instance of the object type.
class function InstanceSize: Longint;
System::TObject::InstanceSize indicates how many bytes of memory are required for a class's instance data. System::TObject::InstanceSize is called from methods that allocate and deallocate memory. System::TObject::InstanceSize is not a virtual method, so it cannot be overridden. System::TObject::InstanceSize should be called only when implementing a custom version of System::TObject::NewInstance.
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