1

Ref

  1. #include <iostream>
  2.  
  3. using namespace std;
  4.  
  5. float &index( float *v, int i )
  6. {
  7.     return v[ i ];
  8. }
  9.  
  10. int main() {
  11.     int x = 33;
  12.     int &y = x;
  13.  
  14.  
  15.     cout << "x (0x" << &x << ") = " << x << endl;
  16.     cout << "y (0x" << &y << ") = " << y << endl;
  17.  
  18.     y = 99;
  19.  
  20.     cout << "y (0x" << &y << ") = " << y << endl;
  21.     cout << "x (0x" << &x << ") = " << x << endl;
  22.  
  23.     int *pi = &x;
  24.  
  25.     cout << "pi (0x" << &pi << ") = 0x" << pi << " = " << *pi << endl;
  26.  
  27.     int &r = *pi;
  28.     cout << "r (0x" << &r << ") = " << r << endl;
  29.  
  30.     r = 11;
  31.     cout << "y (0x" << &y << ") = " << y << endl;
  32.  
  33.     float v[ ] = { 3.4, 1.2, 4.9 };
  34.     cout << "v[ 1 ] = " << index( v, 1 ) << endl;
  35.     index( v, 1 ) = 7.2;
  36.     cout << "v[ 1 ] = " << index( v, 1 ) << endl;
  37.  
  38.     const float *pf = new float( 3.14159 );
  39.     cout << "pf (0x" << pf << ") = " << *pf  << endl;
  40.     delete pf;  // shouldn't be possible!
  41.  
  42.     float &(*pindex)(float *, int ) = &index;
  43.     pf = &pindex( v , 0 );
  44.     cout << "pf (0x" << pf << ") = " << *pf  << endl;
  45. }

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