On 11/21/05, Andy Little <andy@servocomm.freeserve.co.uk> wrote:
I presume that Matt Calabrese is also working on his submission, which takes a radically different approach from the sound of it.
Yup, it's still in the works. I'm currently in the process of switching over to using Eric Niebler's Proto library internally for dealing with expression templates (a sublibrary which was used in xpressive), as opposed to the bare-bones expression templates I was developing. As a side note, if any other unit library developers are interested (or anyone else), I recently made a simple metafunction for yielding integral and floating point promotions (4.5 and 4.6), as well as a binary metafunction for yielding the type after usual arithmetic conversions (5p9), both of which are almost essential for elegantly obtaining the return types of common operations on arithmetic types. They're extremely useful for determing the proper return type of common forwarded unary and binary operations of quantities to an underlying arithmetic value type, such as for negation (which implies a promotion) or subtraction (which implies usual arithmetic conversions). If people haven't already developed their own solutions and would like these (already boostified), they are very small and quick to upload. Both just examine compiler behavior to determine the appropriate datatypes. They work with extended types such as long long, and promotion works correctly even with enum types as input. -- -Matt Calabrese