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Aspects of object lifetime vary between programming languages and within implementations of a language. The core concepts are relatively common, but terminology varies. For example, the concepts of create and destroy are sometimes termed construct and destruct and the language elements are termed constructor (ctor) and destructor (dtor).
In the raw .NET paradigm, the nondeterministic destruction model overrides the protected Finalize method of the root Object class, while the deterministic model is implemented through the IDisposable interface method Dispose (which the C++/CLI compiler turns the destructor into). Objects from C# or VB.NET code that override the Dispose method ...
The overridden base method must be virtual, abstract, or override. In addition to the modifiers that are used for method overriding, C# allows the hiding of an inherited property or method. This is done using the same signature of a property or method but adding the modifier new in front of it. [6] In the above example, hiding causes the following:
Objective-C: the destructor method has the name dealloc. Perl: the destructor method has the name DESTROY; in the Moose object system extension, it is named DEMOLISH. PHP: In PHP 5+, the destructor method has the name __destruct. There were no destructors in prior versions of PHP. [4] Python: there are __del__ methods called destructors by the ...
To elaborate on the above example, consider a base class with no virtual functions. Whenever the base class calls another member function, it will always call its own base class functions. When we derive a class from this base class, we inherit all the member variables and member functions that were not overridden (no constructors or destructors).
The C++ language does allow a program to call a destructor directly, and, since it is not possible to destroy the object using a delete expression, that is how one destroys an object that was constructed via a pointer placement new expression. For example: [11] [12]
Firstly, if a derived class overrides a dispose method in the base class, the overriding method in the derived class generally needs to call the dispose method in the base class, in order to properly release resources held in the base. Secondly, if an object has a "has a" relationship with another object that holds a resource (i.e., if an ...
And even if methods owned by the base class call the virtual method, they will instead be calling the derived method. Overloading occurs when two or more methods in one class have the same method name but different parameters. Overriding means having two methods with the same method name and parameters. Overloading is also referred to as ...