Re: [Boost-users] PP: 2 to the power x macro

2010/2/4 Hicham Mouline

So Roman, what do you think of my POWER2 implementation?

It is very slow (to preprocess) in an actual example I have. Can anyone see a faster implementation?

I'd use something like this: #define POWER_2_0 1 #define POWER_2_1 2 #define POWER_2_2 4 #define POWER_2_3 8 #define POWER_2_4 16 #define POWER_2_5 32 #define POWER_2_6 64 #define POWER_2_7 128 #define POWER_2_8 256 #define POWER_2(n) BOOST_PP_CAT(POWER_2_, n) It's obviously fast and obviously correct. Roman Perepelitsa.