[Boost-users] [Boost.Parameter] How to Use Named Parameters in a Class Hierarchy?

From: Wu Yinghui, Freddie (yhwu_at_[hidden])
Date: 2006-10-25 06:06:03

Dear all,

I'm implementing a hierarchy of classes to handle different types of
objects. The characteristics of these objects are mostly similar (so I
can put them into a container that knows only about the pure abstract
base interface type), but some properties are specific to each object types.

I plan to use Boost.Parameter for its capability of providing named
parameter to these object types. However, I have one problem in this
approach: Since Boost.Parameter requires that the function processing
the ArgumentPack to be a template, I cannot make it virtual (a member
function template cannot be virtual) in my pure abstract base interface.
Furthermore, due to the lack of "virtual" member function, I cannot use
the base class pointer to provide these named parameters to some subclasses.

So my question is: Is there a way to tackle this problem? (Use
Boost.Parameter with virtual member functions? Or avoid using
Boost.Parameter, but provide a way to access subclass properties that
are not know directly via the base class?)

Any suggestion is welcomed!

Cheers,

Freddie

-- 
Wu Yinghui, Freddie
Research & Development
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Volume Interactions Pte Ltd
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