Re: Overloading address of operator

tohava wrote:


It allows you to write a class that supports taking the address of a
temporary (rvalue). For example, in order to pass it to a function that
expects a pointer, or to swap an object that is constructed "on the
fly":

  //////////////////////////////
  #include <cstdlib>
  #include <algorithm>

  class foo
  {
  public:
    foo* operator&() { return this; }
  };

  foo get_foo() { return foo(); }

  template <typename T>
  bool is_null_ptr(T* arg) { return arg == NULL; }

  int main()
  {
    if ( is_null_ptr( &get_foo() ) )
    {
      // A serious problem ;-)
      return EXIT_FAILURE;
    }

    foo foo_obj;

    // Clean up the foo_obj, by swapping with a
    // default constructed foo!
    using std::swap;
    swap( foo_obj, *&foo() );
  }

  //////////////////////////////

Maybe you can think of a more useful example...?

Kind regards,

  Niels
--
Niels Dekker
http://www.xs4all.nl/~nd/dekkerware
Scientific programmer at LKEB, Leiden University Medical Center

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