C++ 异常和结构化异常之间的区别
有人能解释一下 C++ 异常和 MFC 中的结构化异常之间的区别吗?
Can someone explain the difference between a C++ exception and a structured exception in MFC?
推荐答案
你其实有三种机制:
- C++ 异常，由编译器实现 (
try/catch) - Windows 提供的结构化异常处理 (SEH) (
__try/__except) - MFC 异常宏(
TRY、CATCH- 建立在 SEH/C++ 异常之上 - 另见 TheUndeadFish 的评论)
- C++ exceptions, implemented by the compiler (
try/catch) - Structured Exception Handling (SEH), provided by Windows (
__try/__except) - MFC exception macros (
TRY,CATCH- built on top of SEH / C++ exceptions - see also TheUndeadFish's comment)
C++ 异常通常保证在堆栈展开期间自动清理(即运行本地对象的析构函数)，而其他机制则不能.
C++ exceptions usually guarantee automatic cleanup during stack unwinding (i.e. destructors of local objects run), the other mechanisms don't.
C++ 异常仅在显式抛出时发生.许多操作可能会出现结构化异常，例如由于未定义的行为、向 API 传递无效指针、卸载内存映射文件的后备存储等等.
C++ exceptions only occur when they are explicitly thrown. Structured Exceptions may occur for many operations, e.g. due to undefined behavior, passing invalid pointers to APIs, unmounting the backing store of a memory mapped file, and many more.
MFC 确实引入了异常宏来支持异常，即使编译器没有实现它们.
MFC did introduce the exception macros to support exceptions even if compilers didn't implement them.
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