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copied!<p>Going deeper in my problem I read two articles providing tracks for a solution:</p> <ul> <li><strong>Kostadin Damevski</strong>, <em>Expressing Measurements Units in Interfaces for Scientific Component Software</em>;</li> <li><strong>Lingxiao Jiang</strong>, <em>A Practical Type System for Validating Dimensional Units Correctness of C Programs</em>.</li> </ul> <p>The first gives good ideas for the interface implementation. The second gives a complete overview of what you must cope with.</p> <p>I keep in mind that <code>boost::units</code> is a complete and efficient way for dimension consistency at compile-time without overhead at runtime. Anyway, for runtime dimension consistency involving dimensions changes you do need a dynamic structure that <code>boost::units</code> does not provide. So here am I: designing a units class that will exactly fit my needs. More work to achieve, more satisfaction at the end...</p> <p>About the original questions:</p> <ul> <li><code>boost::variant</code> works well (it provides the dynamic <code>boost::units</code> is missing) for this job. And furthermore, it can be serialized out of the box. Thus it is a effective approach. But it is adding a layer of abstraction for a simple - I am not saying trivial - task that could be done by a single class.</li> <li>Casting is achieved by <code>boost::variant_cast<></code> instead of <code>dynamic_cast<></code>.</li> <li><code>boost::any</code> could be easier to implement but serialization becomes an hard way. </li> </ul>

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