new on stack instead of heap (like alloca vs malloc)

Question

Is there a way to use the new keyword to allocate on the stack (ala alloca) instead of heap (malloc) ?

I know I could hack up my o

Answer 1

Jeffrey Hantin is quite correct that you can use placement new to create it on the stack with alloca. But, seriously, why?! Instead, just do:

class C { /* ... */ };

void func() {
    C var;
    C *ptr = &var;

    // do whatever with ptr
}

You now have a pointer to an object allocated on the stack. And, it'll properly be destroyed when your function exists.