UART Baud Rate Validation

#include <iostream>

class UARTDriver {
private:
    // Member is now private to prevent arbitrary assignments
    int baud_rate;

public:
    // Initialize with the default safe baud rate of 9600
    UARTDriver() : baud_rate(9600) {}

    /**
     * Updates the baud rate only if it matches hardware-supported values.
     * Supported: 9600, 19200, 115200.
     */
    void setBaudRate(int requested_rate) {
        if (requested_rate == 9600 || 
            requested_rate == 19200 || 
            requested_rate == 115200) {
            baud_rate = requested_rate;
        }
        // If invalid, we ignore the request and keep the previous state.
    }

    /**
     * Provides read-only access to the current active baud rate.
     */
    int getBaudRate() const {
        return baud_rate;
    }
};

int main() {
    int N;
    // Standard check to ensure we read the number of commands correctly
    if (!(std::cin >> N)) return 0;

    UARTDriver driver;

    for (int i = 0; i < N; ++i) {
        int req;
        if (!(std::cin >> req)) break;

        // Use the validating setter instead of direct member access
        driver.setBaudRate(req);

        // Retrieve the current state via the getter
        std::cout << "Active: " << driver.getBaudRate() << std::endl;
    }

    return 0;
}