Part 3: Delving into Object-Oriented Programming with MQL5
Explore Part 3: Object-Oriented Programming in MQL5 and dive deep into the essentials of object-oriented programming (OOP) within the MQL5 language. If you've ever felt overwhelmed by managing multiple entities in your trading systems, then this guide is just what you need to boost your programming efficiency and output quality.
OOP is all about leveraging objects, which are custom type variables defined by you, the programmer, using MQL5 tools. By creating these custom types, you can effectively model your trading objects, making it simpler to write and maintain your programs.
In this segment, we’ll explore how to define new types through classes, structures, and unions. These custom types allow you to seamlessly combine data and algorithms, giving you the power to describe the state and behavior of your trading applications.

The author emphasizes the "divide and conquer" principle, illustrating how each object acts as a mini-program, tackling a specific, well-defined task. By combining these objects, you can create a cohesive system to develop complex trading products and services.
To help you get the most out of MQL5, this section introduces the foundational principles of OOP, complete with practical examples. You’ll also discover the versatility of templates, interfaces, and namespaces, revealing the true power of OOP in crafting robust MQL5 applications.
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