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From: Andy Little (andy_at_[hidden])
Date: 2005-12-21 07:57:18


Regarding using Typeof with compile time libraries such as mpl. mpl doesnt
actually deal in types so when I operate on a mpl vector I might get back a
mpl::vector7 or something else. Similarly with mpl::math::rational I might get
back a mpl::math::rational or a mpl::math::simplified_rational.

 That makes for a very flakey quantities library unfortunately, because in
compliant mode Typeof is totally dependent on implementation changes in these
other libraries, and when the compiler crashes because of unregistered types it
does so in a huge fashion.

Not sure what if anything can be done about it but I'm wondering whether it is
worth asking library authors now to provide a mechanism so that user can
register their libraries types (that would be eg a mpl::vector +++ anything it
might turn into... is that possible or impractical? )without hassle. That would
solve my problem I think, but maybe would result in a type registration

Any mechanism that allows use of Typeof without dependencies on implementation
details of other libraries would be appreciated!

Andy Little

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