跨 DLL 边界抛出 C++ 异常

问题描述

我已经阅读了关于不应如何在一个 DLL 中分配堆内存并从该 DLL 外部释放它的各种内容.但是如果抛出一个只是临时的异常对象(大多数异常对象都是如此)呢?例如:

I've read various things about how one should not allocate heap memory in one DLL and deallocate it from outside that DLL. But what about throwing an exception object that is a just a temporary (as most exception objects are)? E.g.:

throw my_exception( args ); // temporary: no heap allocation

当异常对象在 DLL 外被捕获时，最终会执行该对象的析构函数，并回收该对象的非堆内存.因为它不是堆内存所以可以吗?

When the exception object is caught outside the DLL, the destructor for that object will eventually be executed and the non-heap memory for the object will be reclaimed. Is that OK since it's not heap memory?

推荐答案

只有当所有模块都使用相同的 C++ 运行时(在这种情况下它们也共享一个堆)时，才可能跨 DLL 边界抛出 C++ 异常.但这可能是一种维护负担，尤其是当涉及多个供应商的库时，因此不鼓励这样做.

Throwing C++ exceptions across DLL boundaries is only possible when all modules use the same C++ runtime, in which case they share a heap as well. But this can be a maintenance burden, especially when libraries from multiple vendors are involved, so it is discouraged.

如果您想要跨多个编译器/编译器版本/编译器设置进行可移植的错误处理，请使用返回代码或操作系统提供的异常(例如 Windows 上的 SEH)/

If you want error-handling which is portable across multiple compilers/compiler versions/compiler settings, either use return codes or OS-provided exceptions (e.g. SEH on Windows)/

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