On 2013-09-07 16:10, Joseph Rushton Wakeling wrote:
Hello all,TDPL gives a description in Section 6.13 (pp. 230-233) of a method for subtyping by storing a private instance of the base type and using "alias ... this" to access its methods. The example given is as follows: class StorableShape : Shape { private DBObject _store; alias _store this; this() { _store = new DBObject; } } However, I've found that this won't work because the "private" keyword means that functions and objects outside the module won't be able to access the public methods of _store, even though the alias itself is public. I've attached a small example with 2 classes, A and B, where B stores an internal copy of A in a similar manner. In this case, if you run rdmd inherit.d, you'll get an error: inherit.d(8): Error: class inheritance.B member base is not accessible Is this a bug, or intentional, and if it's intentional, how can one make the public methods of the "base" class accessible while keeping the instance private? Thanks & best wishes, -- Joe
Try using opDispatch as a described in the other thread. -- /Jacob Carlborg
