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A Policy-Based Observer.

What would happen if Andre Alexandrescu, the author of Modern C Design. And Martin Fowler, the author of Refactoring. Were required to refactor and generalize the Observer pattern sample code from the book Design Patterns. I imagine we'd end up with a policy-based observer pattern. And you'll see the original sample code:. Class Subject { public: virtual Subject(); virtual void Attach(Observer*); virtual void Detach(Observer*); virtual void Notify(); protected: Subject(); private: List. The code is pull-...

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A Policy-Based Observer. | observer.dlma.com Reviews

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What would happen if Andre Alexandrescu, the author of Modern C Design. And Martin Fowler, the author of Refactoring. Were required to refactor and generalize the Observer pattern sample code from the book Design Patterns. I imagine we'd end up with a policy-based observer pattern. And you'll see the original sample code:. Class Subject { public: virtual Subject(); virtual void Attach(Observer*); virtual void Detach(Observer*); virtual void Notify(); protected: Subject(); private: List. The code is pull-...

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6 finale

7 design patterns

8 invoking update

9 to it

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A Policy-Based Observer. | observer.dlma.com Reviews

https://observer.dlma.com

What would happen if Andre Alexandrescu, the author of Modern C Design. And Martin Fowler, the author of Refactoring. Were required to refactor and generalize the Observer pattern sample code from the book Design Patterns. I imagine we'd end up with a policy-based observer pattern. And you'll see the original sample code:. Class Subject { public: virtual Subject(); virtual void Attach(Observer*); virtual void Detach(Observer*); virtual void Notify(); protected: Subject(); private: List. The code is pull-...

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observer.dlma.com

1

A Policy-Based Observer

http://observer.dlma.com/finale.html

Download Project: observer.zip. Download the sources from the link above. It includes a sample app that illustrates the tradeoffs of the new design. The pattern grew in terms of lines of code. So was the refactor worth it? The client code greatly benefits from the new flexibility of the library. The client code can look basically the same as it used to. And if it wants to take advantage of the new advanced features, it can. Not a line of the library has to change. That's all, folks.

2

A Policy-Based Observer

http://observer.dlma.com/policyize.html

So Multiply-inheriting recursively templatized base classes is a bad idea. This is where Andrei's policy-based design comes to the rescue. The Observer can be declared with a policy that specifies whether it should auto-manage a list of subjects, or no, be a lean mean observing machine, and the descendant class will make its own guarantees about lifespans. Here's the default policy (and updated Observer) that monitors the lifespans of the observer and subject classes. The syntax for construction, attachi...

3

A Policy-Based Observer

http://observer.dlma.com/whoops.html

Let's try out the idea of making. An idiom for the users of our pattern. Their observers must also be subjects that send out "detach me" notices when they are deleted. And their subjects will be observers of those messages Like so:. Now observers can be deleted before subjects! But, wait. Now that observers contain a list of subjects, when one of those subjects leaves early, it'll have to notify the observer that's watching it to notify it of its demise.

4

A Policy-Based Observer

http://observer.dlma.com/templatize.html

Let's refactor that code. While we're at it, let's now conform to the curent C Coding Standards. And not use names preceded with an underscore. Let's fix issue 1. Sprinkle in std: list, for each, bind2nd and mem fun, and we're good to go. Now I can delete that custom container! And let's fix issue 2. Templatize the message, so it can be push model, and Observers may subscribe to only the message types they want. (Or to as many different messages as they please.). That small refactor already buys us.

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