[Boost-users] [MPL] what is my base class?

Subject: [Boost-users] [MPL] what is my base class?
From: John Dlugosz (JDlugosz_at_[hidden])
Date: 2010-05-21 12:44:15

I'm writing a class template, say C<T>, that has essentially different features depending on a classification of type T.  So, I implemented Ca and Cb as befitting the two categories, and then make that transparent to the user by making a stub for C that inherits from either of those two, using boost::mpl::if_ to choose between them.

However, the constructors have to be brought down manually.  To "inherit" them, they need to be forwarded to the base class:  C (...args...) : Ca (...args...) {}

The problem is, I can't easily name the base class here in the base initialization list.  I'm not even sure repeating the if_ metaexpression here would work, since the init list doesn't even like typedefs but wants the literal name of the class.

Did I paint myself into a corner?  Please help.

In one case, it was not a problem to use only a default constructor and call an inherited Initialize function from the body.  In the other case, I want to keep my reference member initializers.

Thanks,
--John

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