Selfmade friend-classes...



  • while inspecting a piece of code, i discovered the following solution for using friendclasses - the advantage: it's the decision of the friend to be a friend or not:

    <font color="#000000" face="Courier New">class MyClass {</font><font color="#000000">
    </font><font color="#000000" face="Courier New">  ...</font><font color="#000000">
    </font><font color="#000000" face="Courier New">#ifndef CLASS_FRIEND</font><font color="#000000">
    </font><font color="#000000" face="Courier New">  protected:</font><font color="#000000">
    </font><font color="#000000" face="Courier New">#else</font><font color="#000000">
    </font><font color="#000000" face="Courier New">  public:</font><font color="#000000">
    </font><font color="#000000" face="Courier New">#endif
      ...
    </font><font color="#000000" face="Courier New">};</font>



  • That's a really entertaining bug waiting to happen.  Nothing prevents the compiler from mangling private, protected, and public class member symbols differently; declaring the same class in two compilation units with different accessibility levels for the members is asking for hard-to-diagnose linker errors.


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