Tony D <tony_in_da_uk@yahoo.co.uk> writes:
For the record, another important benefit of type_maps is that code can be instantiated with a type_map, and a template <typename T> fn(T& t) can perform operations on the T field in the typemap, including storing the function's argument, or setting it to the retrieved value.
By way of contrast, for code instantiated with an arbitrary structure there's no knowledge of field identifiers, so equivalent field access can only be achieved if that structure is directly exposed through the API.
I was curious with the MPL guys could see any use in having a typedef in a type_map for a mpl::vector, but it's pretty clear nobody reading this gives a hoot about "type_map"s as described, so I'll put a sock in it.
Are these things any different from the ArgumentPacks created by the Boost.Parameter library? -- Dave Abrahams Boost Consulting www.boost-consulting.com