Best practices for error handling in C++ function default parameters and variadic parameters

In C, using default parameters and variadic parameters can optimize error handling: Default parameters allow setting default error codes and messages, simplifying function calls. Variable parameters accept a variable number of parameters, making it easy to record multiple error messages. Best practices include using default values ​​instead of special values, logging all errors, and maintaining consistency to improve code readability and maintainability.

Best practices for C function default parameters and variable parameters in error handling

In C, default parameters and Variable parameters are very useful in error handling. By using them correctly, you can create code that is easy to use, robust, and maintainable.

Default parameters

Default parameters allow a function to use default values ​​when no actual parameters are passed. This is particularly useful in error handling, as you can set a default error code or message for a function. For example:

void handleError(int errorCode = -1, const string& errorMessage = "Unknown error") {
  // 错误处理代码
}

This way you can easily set default values ​​for function calls without explicitly passing parameters.

Variadic parameters

Variadic parameters allow a function to accept a variable number (zero or more) of parameters. This is very useful in error handling, as you can log any number of error messages or codes. For example:

void logErrors(const string& prefix, ...) {
  va_list args;
  va_start(args, prefix);
  // 解析和记录可变参数
  va_end(args);
}

Practical case

The following is a practical case using default parameters and variable parameters for error handling:

void doSomething() {
  try {
    // 尝试执行操作
  }
  catch (const std::exception& e) {
    handleError(e.code(), e.what());
    logErrors("Error in doSomething: ", e.code(), e.what());
  }
}

In## In the #doSomething function, we use the default parameters errorCode and errorMessage to handle exceptions. If no actual parameters are passed, default values ​​will be used. We also use variadic parameters to log additional information about the error, if any.

Best Practice

• Use default values ​​instead of NULL or special values: Use default parameters to avoid using NULL or special values. Errors, which can improve code readability and maintainability.
• Log all errors: Using variadic parameters can log any number of error messages or codes, which helps with detailed debugging and troubleshooting.
• Maintain consistency: Use the same default parameter names and order in all error handling functions to improve code readability and consistency.
• Consider exception safety: Default parameters do not make the function exception safe. If you need to handle exception safety, consider using noexcept marked functions or smart pointers.

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