Multiple Dispatch: A New Approach Using Templates and RTTI
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Description: This article focuses on two new techniques based on templates and Run Time Type Identification (RTTI).
A new approach using templates and RTTI Published in C++ Report, June 1998. Virtual functions allow polymorphism on a single argument; however, sometimes there is a need for multi-argument polymorphism. Double dispatch, commonly used in C++ to implement multi-methods, does not lend easily extensible code. Solutions based on function tables are difficult to implement and prevent repeated derivation. This article focuses on two new techniques based on templates and Run Time Type Identification (RTTI). The first is faster but less flexible, the second is slower, but allows new classes to be added without any need to change existing ones.
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