How do I implement the visitor pattern in financial systems with C++?

The Visitor Pattern is a design pattern that allows you to separate an algorithm from the objects on which it operates. This is particularly useful in financial systems where you may want to perform various operations on different types of financial instruments (such as stocks, bonds, etc.) without modifying their classes.

Here's a basic implementation of the Visitor Pattern in C++ for a financial system:


class IVisitor; // Forward declaration

// Abstract base class for financial instruments
class FinancialInstrument {
public:
    virtual void accept(IVisitor& visitor) = 0; // Accept method for the Visitor
};

// Forward declaration of financial instruments
class Stock;
class Bond;

// Visitor interface
class IVisitor {
public:
    virtual void visit(Stock& stock) = 0;
    virtual void visit(Bond& bond) = 0;
};

// Concrete financial instrument: Stock
class Stock : public FinancialInstrument {
public:
    void accept(IVisitor& visitor) override {
        visitor.visit(*this);
    }
    
    void info() {
        std::cout << "I am a Stock." << std::endl;
    }
};

// Concrete financial instrument: Bond
class Bond : public FinancialInstrument {
public:
    void accept(IVisitor& visitor) override {
        visitor.visit(*this);
    }
    
    void info() {
        std::cout << "I am a Bond." << std::endl;
    }
};

// Concrete Visitor
class FinancialInfoVisitor : public IVisitor {
public:
    void visit(Stock& stock) override {
        stock.info(); // Handling stock
    }
    
    void visit(Bond& bond) override {
        bond.info(); // Handling bond
    }
};

int main() {
    Stock stock;
    Bond bond;
    
    FinancialInfoVisitor visitor;
    
    stock.accept(visitor); // Visitor operates on Stock
    bond.accept(visitor);  // Visitor operates on Bond
    
    return 0;
}

How do I implement the visitor pattern in financial systems with C++?

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How do I implement the visitor pattern in financial systems with C++?

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