//
// This is example code from Chapter 17.5 "Destructors" of
// "Programming -- Principles and Practice Using C++" by Bjarne Stroustrup
//

//------------------------------------------------------------------------------
// a very simplified vector of doubles:
class vector {
   int sz;              // the size
   double* elem;        // a pointer to the elements
public:
   vector(int s)        // constructor
      :sz{s},          // initialize sz
       elem{new double[s]} // initialize elem
      {
         for (int i=0; i<s; ++i) elem[i]=0; // initialize elements
      }
   int size() const { return sz; }        // the current size
   // ...
   void clean_up() { delete[] elem; elem = 0; } // free memory
};

//------------------------------------------------------------------------------

void f(int n)
{
   vector v(n);    // allocate n doubles
   // ... 
}

//------------------------------------------------------------------------------

void f2(int n)
{
   vector v(n);         // define a vector (which allocates another n ints)
   // ... v ...
   v.clean_up();        // clean_up() deletes elem
}

//------------------------------------------------------------------------------

int main()
{
   f(5);
   f2(7);
}

//------------------------------------------------------------------------------