[Uml-devel] [Bug 60452] missing keywords for declaring operations and variables

[Michael Dean]

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http://bugs.kde.org/show_bug.cgi?id=60452     




------- Additional Comments From mtdean at hotmail.com  2003-07-06 16:01 -------
Oh, I also forgot the keyword mutable.
(In case anyone is not familiar with the keyword mutable, it's a flag to tell
the compiler the constness of a variable can be cast away)
Ex:

class A
{
  public:
    mutable int myint;
    int notmyint;
};

int main( int argc, char** argv )
{
  const A myA;
  myA.myint = 5;    //  **** ERROR **** myint is const because it's containing
                    //                  class is const

  const_cast<A>(myA).myint = 5;    // This compiles fine because its constness
                                   // has been cast away by const_cast<T>()

  const_cast<A>(myA).notmyint = 5; //  **** ERROR **** will not compile because
                                   //  notmyint was not declared mutable
}

I think I've thought of all the neccessary missing keywords now (hopefully).
BTW, http://www.gotw.ca/gotw/006.htm is a great guru article on when to use
const and when to not, if anyone's interested in it.  It's by Herb Sutter, good
article.