How do I map error codes to exceptions and vice versa?

In C++, mapping error codes to exceptions and vice versa is a common practice for handling errors more effectively. Error codes are often used in functions to signal specific failure conditions, while exceptions provide a way to throw errors that can be caught and handled using try-catch blocks. Below is an example illustrating how to implement this mapping.


    #include <iostream>
    #include <stdexcept>

    // Define custom exception class
    class CustomException : public std::runtime_error {
    public:
        explicit CustomException(const std::string &message) : std::runtime_error(message) {}
    };

    // Function that returns an error code
    int riskyOperation() {
        // Simulating an error
        return -1;  // Error code
    }

    // Function to map error codes to exceptions
    void execute() {
        int errorCode = riskyOperation();
        if (errorCode < 0) {
            throw CustomException("An error occurred: error code " + std::to_string(errorCode));
        }
    }

    int main() {
        try {
            execute();
        } catch (const CustomException &e) {
            std::cerr << "Caught an exception: " << e.what() << std::endl;
        }
        return 0;
    }

How do I map error codes to exceptions and vice versa?

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How do I map error codes to exceptions and vice versa?

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