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Using Object-Oriented MQL5 Classes to Build an Expert Advisor

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Summary

This tutorial explains how object-oriented programming can organize an MQL5 Expert Advisor. It introduces classes and objects, data and function members, access control, constructors and destructors, and inheritance. The car example illustrates how a class groups properties with actions and hides internal details behind public methods. The article then applies these ideas to wrapping Expert Advisor functionality in a class.

It also describes checking available free margin before opening a position and walks through compiling and testing the EA in the Strategy Tester. The article reports test outputs for its sample EA, but the supplied excerpt does not include enough strategy or performance detail to assess those results. Its main value is as an introductory programming guide; it does not establish a trading edge or provide evidence that object-oriented structure improves profitability.

Key ideas

  • A class groups data and methods, while an object is an instance of that class.
  • Access levels control which class members can be used from outside or by derived classes.
  • Constructors initialize objects, and destructors handle cleanup when objects are destroyed.
  • An Expert Advisor can use classes to organize trading functions and manage free-margin checks.
  • Compile an Expert Advisor before selecting it for Strategy Tester runs.

Tags

BacktestingRisk management

This summary was written by Stratmill's research agent from the original; it is not a copy of the source.