Larry Evans a écrit :
By blob do you mean Binary Large OBject:
Sorry - in fact I meant any opaque data type.
to be able to manipulate class-like objets, with the same interface as a real class. ( ... maybe std::map< const std::type_info *, boost::any > , with type_info referring a class'member ? ) I agree that the concept is not quite clear at the moment, but again this is related to communicating data with software components which cannot be re-compiled at each modification of a user's class.
This must be different than fusion's tuple because you mention boost::any, but wait, why not just use boost::any since it can hold any time and your wouldn't need the std::map.
I must be missing somehting :(
I was not clear: One of the aspects of my problem is that I wish to process all the members of a class, in a homogeneous way, while keeping the type information. A way to do that would be - in a way (This code does not make sense, it is just here to explain with I try to to with CRD) : boost::tuple< Class:Member1, Class::Member2, ... > ... with an actual 'Class' object ... ... generating a container of : std::pair< const std::type_info *, boost::any > Each of the boost::any object would actually store the value of a member of the 'Class' object. But, all std::pairs have the same type which is convenient for dynamic processing.
The possibility to add dynamic attributes for class members, indexed for example by typeid (Column names in a SQL table, or specific format for displaying a given class member), which may change from one object to another of the same class.
Now that we have, for example, a std::map indexed with const std::type_info *, we can add to it extra properties, for example fprintf format directives, as a std::map< const std::type_info *, std::string >. It is even possible to stack on to of boost::any, other properties based on the template parameters: This still allows to carry type-related information, but with the same type for all members of the class. -
-regards, Larry
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