[ridiculous_fish]

Simple example:

    shared_ptr<int> global;
    void func(const shared_ptr<int>& v) {
        global.reset();
        *v += 1; // ohno
    }
    func(global);

[PaulDavisThe1st]

fair enough, but that's fairly stupid programming :)

/* XXX the argument might be the same as the global value we're about to modify. API designers, eh? */

[MaulingMonkey]

Doesn't have to be global - could be a member that gets modified in a callback, or that goes out of scope because something else gets deconstructed.

I'd also like to inquire as to what nontrivial codebase you've seen that contains no fairly stupid programming. I keep hearing about them, and trying to prove their existence, but so far I've collected more concrete evidence for the existence of bigfoot than I have for the existence of such codebases.