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From: Tony D (tony_in_da_uk_at_[hidden])
Date: 2005-11-04 19:56:48

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



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