C / C++ / MFC

template <class t=""> class Safe {

    T* p ; // p points to a T allocated using new
    public :
    Safe () : p (new T ) { }
    ˜Safe () { delete p ; }
    Safe& operator =(const Safe&a) { *p = *a .p ; return *this; }
    // ...
};
template <class t=""> class Unsafe { // sloppy and dangerous code
    T* p ; // p points to a T
    public :
    Unsafe (T* pp ) : p (pp ) { }
    ˜Unsafe () { if (!p->destructible ()) throw E(); delete p; }
    Unsafe& operator =(const Unsafe&a)
    {
        p->˜T (); // destroy old value (§10.4.11)
        new(p)T (a.p ); // construct copy of a.p in *p (§10.4.11)
        return *this;
    }
    // ...
};
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