All about mql OOP

[Alain Verleyen]

From my experience on this site, it's not always easy to find the good topic(s) in the mass of information. So I will use this topic as central one concerning OOP usage in mql.

Feel free to make suggestion.

• An interesting discussion and reference about "Prefer to make interfaces non-virtual, using Template Method. Prefer to make virtual functions private."
• How to override Compare() in CObject so CList sort() works? Talking about MQ standard library and it's usage.
• Observer pattern, discussion about implementation of this pattern in mql.
• State design pattern, implementation in mql with "forward reference".
• Very interesting discussion (but a bit theoretical) about inheritance and polymorphism in relation to GUI and graphical objects management.
  

• Inheritance is private by default and in debugger mode, the Watcher for pointer to object is showing the declared type, not the instantiate type.

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The Stanislav's blog will give you a lot of ideas and information.

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<work in progress>

[Alain Verleyen]

Interesting links :

Question regarding encapsulating a private structure definition inside a class.

Always Initialize your member variables!

[Sergey Golubev]

The discussion thread: OOP issue : idea to break a vicious circle ?

[JeeyCi]

Alain Verleyen:
   

Very interesting discussion (but a bit theoretical) about inheritance and polymorphism in relation to GUI and graphical objects management

BTW, I often think, that polymorphism appeared initially to solve the problem of GUI needs to interact with user dynamically...

all other polymorphism use-cases are just of secondary  benefit - this is my viewpoint... and often rather doubtfully to be a benefit... often delegation is more preferable than inheritance