On 07/15/2012 10:25 AM, Bart Janssens wrote:

OK, thanks for the comments. It's similar to what I had in mind, but
(unless I'm missing something) all product terms in our expressions
should have a distinct type if they represent different values, so I
could get away with just using a fusion map and avoid the copying and
even the map lookup.

In which case, you can replace the std::map<Expr, result_type> by a boost::optional<result_type>.
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