Suppose I have a bunch of fruit: class Fruit { ... }; class Apple : public Fruit { ... }; class Orange: public Fruit { ... };
I need help to generify and implement the visitor pattern. We are using tons of instanceof and it is a pain. I am sure it can be modified, but I am not sure how to do it.
Is it generally acceptable to allow a Visitor to modify state of the Receiver, or should that be 开发者_如何学Pythona Command pattern instead?The purpose of the visitor pattern is to allow new operati
In a typical implementation of the Visitor pattern, the class must account for all variations (descendants) of the base class.There are many instances where the same method content in the visitor is a
I always thought an object needs the data and the messages to act on it. When would you want a method that is extrinsic to the object? What rule of thumb do you follow to have a visitor? This is suppo
I implemented the Visitor pattern in C++ using a STL-like iterator for storing the Visitor\'s current position in the container. Now I would like to change the container while I开发者_开发百科 iterate
This question already has answers here: 开发者_运维问答 When should I use the Visitor Design Pattern? [closed]
I\'m trying to use the visitor pattern to serialize the contents of objects. However one snag I\'m hitting is when I\'m visiting strings. My strings are of a templated type, similar to STL\'s basi开发
My collegue suggested me to write a visitor pattern to navigate the AST. Can an开发者_StackOverflow中文版yone tell me more how would I start writing it?
I have been searching around for days to find an answer to this performance based issue. After diggingthe Internet so far I have learned that there are couple of ways to use the Enums in java, well do
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