// simple_vector.h: simple vectors - probably wouldn't want to use in real code
// based on Stroustrup, A Tour of C++, p. 37

#include <stdexcept>

class Vector {
public:
   Vector(int size) : elements{new double[size]}, _size{size}
   {
      for(int i = 0; i < size; ++i)
         elements[i] = 0.0;
   }
   
   ~Vector() {
      delete [] elements;
   }

   int size() { return _size; }

   double& operator[](int index) {
      if ( index < 0 || index >= _size )
         throw std::out_of_range("Illegal index into vector.");
      return elements[index];
   }
private:
   int _size;                   // debugging trick: make this first
   double *elements;
};