智能指针如何知道何时在程序崩溃时释放资源？

Question

当程序崩溃时，使用诸如unique_ptr之类的智能指针的c ++项目如何知道释放资源？

Answer 1

If the program crashes "gracefully" due to a handled exception, the stack unwinding will call the destructors on any smart pointers and free the memory.

For complete crashes (eg segmentation fault, call to std::terminate() ), it is the operating system that will free any memory and resources held by the program.

Answer 2

When a C++ program crashes, it exits. The operating system cleans up any OS resources it may have asked for, which includes memory, but also other resources (file handles for example).

Thus, C++ does not clean up - the operating system does. What once was the C++ heap is returned to the operating system as free memory.