example3_partial_implementation.cpp

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#include <iostream>

// Abstract class acting as an interface
class Logger {
public:
    virtual void logInfo(const std::string& message) = 0;
    virtual void logWarning(const std::string& message) = 0;
    virtual void logError(const std::string& message) = 0;
};

class ConsoleLogger : public Logger {
public:
    void logInfo(const std::string& message) override {
        std::cout << "INFO: " << message << std::endl;
    }

    void logWarning(const std::string& message) override {
        std::cout << "WARNING: " << message << std::endl;
    }

    void logError(const std::string& message) override {
        std::cout << "ERROR: " << message << std::endl;
    }
};

class FileLogger : public Logger {
public:
    void logInfo(const std::string& message) override {
        // Imagine this writes to a file
        std::cout << "Writing INFO to file: " << message << std::endl;
    }

    void logWarning(const std::string& message) override {
        // Imagine this writes to a file
        std::cout << "Writing WARNING to file: " << message << std::endl;
    }

    void logError(const std::string& message) override {
        // Imagine this writes to a file
        std::cout << "Writing ERROR to file: " << message << std::endl;
    }
};

int main() {
    ConsoleLogger consoleLogger;
    FileLogger fileLogger;

    consoleLogger.logInfo("Application started.");
    fileLogger.logError("File not found.");

    return 0;
}