Behavioral Design Patterns in C++ - Shapes Example - VI

The video tutorial explains the visitor design pattern, which allows adding new operations to existing class hierarchies without modifying them, thus adhering to the open-closed principle. However, it highlights issues such as cyclic dependencies and the inability to perform partial visitation. The tutorial then introduces the acyclic visitor pattern as a solution, which breaks circular dependencies and allows partial visitation by using a marker interface and multiple inheritance.

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