I briefly thought about trying to put together a patch, but, after looking at the code for mpl/multiplies.hpp, I quickly decided that it was way more of a can of worms than I feel comfortable opening. I imagine that it would be relatively simple to do for someone with familiarity with the internals of MPL, but that isn't me... root<> also raises some issues since it only makes sense (on integers) for roots of integers that are themselves integral. This is obviously not a problem for rational roots... Matthias
Hi, to bring this up I believe this is kinda useful. I had to write my own power<> and root<> recently and wondered the excact same thing. Have you written these templates? Maybe you could submit a patch, my version does not use the MPL, I just rely on the good compile time evaluation of constant expressions by gcc.
Kevin
On 4/21/07, Matthias Schabel <boost@schabel-family.org> wrote:
It would be nice if we could represent all compile-time algebraic operations in Boost.Units using MPL arithmetic. At present, MPL supports negate, adds, subtracts, times, divides. Boost.Units additionally would require :
1) unary_plus - the compile-time equivalent of operator+(T) 2) unary_minus - the compile-time equivalent of operator-(T); this is identical to current mpl::negate, but it would be nice to have it for notational consistency with unary_plus 3) power<T,U> (or pow<T,U>) - the compile-time equivalent of pow(T,U) 4) root<T,U> - the compile-time equivalent of pow(T,1/U); can be implemented with power<T,U>, but this is a nicer syntax
to eliminate its remaining compile-time algebra operators. Any thoughts on whether this would be a worthwhile addition to MPL?
Matthias
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