87 lines
3.2 KiB
MQL5
87 lines
3.2 KiB
MQL5
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//+------------------------------------------------------------------+
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//| CSignal.mqh |
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//| Copyright 2025, MetaQuotes Ltd. |
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//| https://www.mql5.com |
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//+------------------------------------------------------------------+
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#property copyright "SoloTrade Official, Solomon"
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#property link "https://www.mql5.com/en/users/SoloTradeOfficial"
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#property version "1.00"
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#property description "THE WORLD MOST INTELLIGENT FOREX AI/ALGO BOTS EVER IN"
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"HUMAN HISTORY OF FINTECH, BY SOLOMON ESHUN"
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"\nTrading Bots in MQL5"
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// Polymorphism
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// Base Class - The "Vehicle"
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class CSignal {
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public:
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// This is a virtual function. It's a placeholder.
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// We expect derived classes to provide their own real implementation.
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virtual bool checkCondition() {
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Print("This is the generic signal. It does nothing.");
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return false; // Default behavior
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}
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};
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// Derived Class 1 - The "Car"
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class CMACrossoverSignal : public CSignal {
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public:
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// We OVERRIDE the base class function with our specific logic
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virtual bool override checkCondition() {
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// --- FAKE LOGIC FOR DEMONSTRATION ---
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// In a real EA, you'd calculate MAs here.
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// Let's pretend the fast MA just crossed above the slow MA.
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Print("MA Crossover Signal: BUY condition met!");
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return true;
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}
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};
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// Derived Class 2 - The "Boat"
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class CRsiSignal : public CSignal {
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public:
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// We OVERRIDE the base class function with our specific logic
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virtual bool override checkCondition() {
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// --- FAKE LOGIC FOR DEMONSTRATION ---
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// In a real EA, you'd calculate the RSI value.
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// Let's pretend RSI is oversold.
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Print("RSI Signal: BUY condition met! (RSI is oversold)");
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return true;
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}
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};
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// Putting it all together in the main part of the program
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void OnStart() {
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// Create a pointer to the BASE class type.
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// This pointer is flexible and can hold any object that INHERITS from CSignal.
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CSignal *myCurrentSignal;
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//--- Scenario 1: We decide to use the Moving Average Crossover signal ---
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Print("--- Using MA Crossover Strategy ---");
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myCurrentSignal = new CMACrossoverSignal(); // The pointer now holds a CMACrossoverSignal object
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// We call the function. MQL5 sees it's a virtual function and
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// automatically calls the OVERRIDDEN version from CMACrossoverSignal.
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if (myCurrentSignal.checkCondition()) {
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// Place Buy Order
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Print("Placing trade based on the active signal.");
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}
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// Clean up memory
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delete myCurrentSignal;
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Print("\n--- Switching to RSI Strategy ---");
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//--- Scenario 2: Now we want to use the RSI signal ---
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myCurrentSignal = new CRsiSignal(); // The SAME pointer now holds a CRsiSignal object!
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// We call the EXACT SAME line of code. But because myCurrentSignal now
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// points to a CRsiSignal object, the RSI version of checkCondition() is called.
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// This is polymorphism in action!
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if (myCurrentSignal.checkCondition()) {
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// Place Buy Order
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Print("Placing trade based on the active signal.");
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}
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// Clean up memory
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delete myCurrentSignal;
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}
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//+------------------------------------------------------------------+
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