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boost::visit_each — Allow limited exploration of class members.
// In header: <boost/visit_each.hpp> template<typename Visitor, typename T> void visit_each(const Visitor& visitor, const T& t, int);
The visit_each mechanism
        allows a visitor to be applied to every subobject in a given
        object. It is used by the Signals library to discover
        signals::trackable objects within a
        function object, but other uses may surface if used
        universally (e.g., conservative garbage collection). To fit
        within the visit_each framework,
        a visit_each overload must be
        supplied for each object type. 
| Effects: | 
 
 
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| Notes: | The third parameter is
       Library authors will be expected to add additional overloads that specialize the T argument for their classes, so that subobjects can be visited. Calls to visit_each are required to be unqualified, to enable argument-dependent lookup. |