Well: type oop in the search field (top right the lens) and select articles and Documentation.
Here are (only) three that might help you:
https://www.mql5.com/en/blogs/post/680569
https://www.mql5.com/en/articles/351
https://www.mql5.com/en/articles/53
Bear in mind there's almost nothing that hasn't already been programmed for MT4/MT5 and is ready even for you.
Its easier and the result has fff: far fewer faults than a do-it-yourself-EA generally speaking!

MQL's OOP notes: Introduction
- 2016.09.16
- www.mql5.com
Both MetaTrader 4 and MetaTrader 5 provide powerfull tools for trading automation, which can be extended even more - to almost any feasible idea - thanks to the built-in programming language - MQL

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Hi
i want to use ccandlepattern class in my own EA and i saw some topics about it but i didn't understand how to initialize this class in my EA.
i am beginner pls help me and if there is any article tell me about that.
thanks a lot