Does a c++ program automatically free memory when it crashes?

Question

I read in Google c++ coding standards that Google does not use exception. If exception is not used, how do you free memory when errors occur in your program?

For example, f() calls g(), and if there is error in g(), I should free all memory allocated in g(), and then call an exception to f(). Once f() catches the exception, f() will free all memory allocated in f(), and exits the program.

If exception is not used, and if there is an error in g(), can I force exit exit(0) , and will the c++ program be smart enough to free all memory that is allocated? My guess is, since c++ maintain a stack and heap, and once the program exits, c++ will automatically free both stack and heap?

Answer 1

当进程因任何原因终止时，操作系统会清除所有使用的内存和文件句柄。

Answer 2

I have heard that some memory types like, on Windows, COM global heap memory cannot be freed for you. However, most memory/handles are cleaned up, because the OS has to cope with the condition that your application crashed. You can certainly guarantee it in the case of process-local memory and most handles like file handles, etc. In the general case, you can assume that the OS will clean up after you when your application exits.

Also, don't ever, ever follow Google's style guide. It's not for C++, it's for C++ minus everything you have to take away to make it C. It might work for Google (dubiously), but it definitely won't work for anyone else.