


What is the future trend of function error handling and exception handling in C++?
Future C error handling trends include: improving errno and providing more detailed error information. Standardize error codes and messages, unifying the format across different libraries. Extended noexcept specifier, optimizing compiler optimizations. Deprecate SEH in favor of a more modern exception handling mechanism. Enhance the semantics of exception handling in coroutines.
Future Trends in Function Error Handling and Exception Handling in C
The methods of handling errors and exceptions in C are constantly evolving. Below we explore its future trends:
Error handling
-
Improvements
errno
: May be redesignederrno
to provide more detailed error information and reduce dependence on specific header files. - Standardization of Error Codes and Messages: It is possible to develop common standards to standardize the format and semantics of error codes and messages in different libraries.
Exception handling
-
Extensions of the noexcept specifier: Possible extensions
noexcept The
specifier is used to specify the type of exceptions that the function can throw, thereby optimizing compiler optimization. - Structured Exception Handling (SEH) Deprecation: SEH may be gradually deprecated and replaced by more modern exception handling mechanisms.
- Improvements in exception handling in coroutines: The semantics of exception handling in coroutines may be enhanced to make them easier to use and debug.
Practical case
Consider the following code snippet:
int divide(int a, int b) { if (b == 0) { // 处理除数为 0 的错误 throw std::runtime_error("除数不能为零"); } return a / b; }
In future C versions, we can use improved error handling One of the mechanisms:
int divide(int a, int b) noexcept(b != 0) { if (b == 0) { // 设置标准化错误代码和消息 errno = EINVALID_ARG; return 0; } return a / b; }
In this example, the noexcept
specifier optimizes the compiler because it knows that the function will never throw an exception (as long as b
is not 0). Additionally, we set standardized error codes using an improved errno
mechanism to provide more detailed error information.
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