#include <iostream>
 
void foobar( int& arg )
{ std::cout << "foobar( int& )\n" ; }
 
void foobar( const int& arg )
{ std::cout << "foobar( const int& )\n" ; }
 
int main()
{
  int i = 7 ;
 
  foobar(i) ; // foobar( int& arg ) : exact match
  // foobar( const int& ) : conversion from int& to const int&
  // exact match preferred over conversion
 
  const int j = 7 ;
  foobar(j) ; // foobar( const int& arg ) : exact match
  // foobar( int& arg ) can't be called at all ( no conversion )
 
}

int main ()
{
  MyClass f(4);
  Func (f); // make copy of object f. f is a modifiable lvalue
  // overload resolves to exact match : MyClass::MyClass( MyClass& )
 
  const MyClass& g = f ;
  Func (g); // make copy of object g. g is not a modifiable lvalue
  // call MyClass::MyClass( const MyClass& ) to make the copy
}