Will exit() or an exception prevent an end-of-scope destructor from being called?

Let's say I have the following code:

struct mytype
{
    ~mytype() { /* do something like call Mix_CloseAudio etc */ }
};

int main()
{
    mytype instant;

    init_stuff();

    start();

    return 0;
}

Is that destructor guaranteed to be called even if exit() is used from somewhere inside start() ?