CSC/ECE 517 Fall 2010/ch5 5c IC: Difference between revisions
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* Hinders compiler in determining exact type of objects | * Hinders compiler in determining exact type of objects | ||
==Single Dispatch== | ==Example in C++== | ||
<pre> | |||
class A | |||
{ | |||
int aMember1; | |||
public: | |||
virtual int method1(); | |||
virtual void method2(); | |||
}; | |||
class B : public A | |||
{ | |||
int bMember1; | |||
public: | |||
virtual int method1(); | |||
virtual void method3(); | |||
} | |||
</pre> | |||
==Single vs Multiple Dispatch== | |||
==References== | ==References== | ||
Revision as of 02:25, 1 November 2010
Dynamic Dispatch
Introduction
Dynamic dispatch is an object-oriented programming concept that refers to the mapping of a method to an object's dynamic runtime type. It is common in many object-oriented languages. Languages such as Java and C++ use single dispatch, while only a few, such as CLOS, use multiple dispatch. Both types of dispatch will be discussed later.
Advantages
- Flexibility
- Extensibility
Disadvantages
- Lookup overhead
- Counter to safety and increased compile-time knowledge
- Obstacle to optimization
- Hinders compiler in determining exact type of objects
Example in C++
class A
{
int aMember1;
public:
virtual int method1();
virtual void method2();
};
class B : public A
{
int bMember1;
public:
virtual int method1();
virtual void method3();
}
Single vs Multiple Dispatch
References
[1] S. Milton, H.W. Schmidt, “Dynamic Dispatch in Object-Oriented Languages”, 2004.
[2] M. Muller, “Message Dispatch in Dynamically-Typed Object-Oriented Languages”, Master’s Thesis, University of New Mexico, 1995.