Any way to prevent dynamic allocation of a class?

Question

I\'m using a C++ base class and subclasses (let\'s call them A and B for the sake of clarity) in my embedded system.

It\'s time- and space-critical, so I really nee

Answer 1

You can poison operator new in just the same way as you can a copy constructor. Just be sure not to poison placement new. A virtual destructor would still be a fine recommendation.

int main() {
    char data[sizeof(Derived)];
    if (condition)
        new (data) Derived();
    else
        new (data) Base();
    Base* ptr = reinterpret_cast(&data[0]);
    ptr->~Base();
}