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For any particular call, the compiler determines which overloaded function to use and resolves this at compile time. This is true for programming languages such as Java. [10] Function overloading differs from forms of polymorphism where the choice is made at runtime, e.g. through virtual functions, instead of statically.
Polymorphism can be distinguished by when the implementation is selected: statically (at compile time) or dynamically (at run time, typically via a virtual function). This is known respectively as static dispatch and dynamic dispatch, and the corresponding forms of polymorphism are accordingly called static polymorphism and dynamic polymorphism.
Dynamic dispatch contrasts with static dispatch, in which the implementation of a polymorphic operation is selected at compile time. The purpose of dynamic dispatch is to defer the selection of an appropriate implementation until the run time type of a parameter (or multiple parameters) is known.
To avoid this overhead, compilers usually avoid using virtual method tables whenever the call can be resolved at compile time. Thus, the call to f1 above may not require a table lookup because the compiler may be able to tell that d can only hold a D at this point, and D does not override f1 .
The compiler builds virtual tables for every virtual or interface method call which is used at run-time to determine the implementation to execute. Also like COM and Java, the Common Language Runtime provides reflection APIs that can make late binding calls. The use of these calls varies by language.
In computer science, compile time (or compile-time) describes the time window during which a language's statements are converted into binary instructions for the processor to execute. [1] The term is used as an adjective to describe concepts related to the context of program compilation, as opposed to concepts related to the context of program ...
If there are base class methods overridden by the derived class, the method actually called by such a reference or pointer can be bound (linked) either "early" (by the compiler), according to the declared type of the pointer or reference, or "late" (i.e., by the runtime system of the language), according to the actual type of the object ...
In computing, static dispatch is a form of polymorphism fully resolved during compile time.It is a form of method dispatch, which describes how a language or environment will select which implementation of a method or function to use.