Re: [boost] [wave] preprocessor directives in output

I'm looking at automating the regeneration of Fusion's preprocess headers with the wave tool. Currently, it's impossible because of stuff like this (from container\vector\vector.hpp):

#if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES) vector(vector&& rhs) : vec(std::forward(rhs.vec)) {} #endif

When the wave driver is run, either BOOST_NO_CXX11_RVALUE_REFERENCES is defined, in which case the block of code gets left out, or else it isn't, in which case the block of code is left in. Both are wrong. What should happen is that the #if and #else directives should be present in wave's output.

I can keep wave from expanding certain named macros with the -N switch, but there doesn't seem to be a way to selectively keep wave from evaluating #if/#else directives. Or is there?

The only way I can see this resolved is to do: // this has to go outside of a #pragma wave option(output: ...) block, // allowing it to go unchanged into the 'generated' code // #if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES) # define VECTOR_MOVE_CTOR() \ vector(vector&& rhs) : vec(std::forward(rhs.vec)) {} #else # define VECTOR_MOVE_CTOR() #endif Then place this into your vector class: VECTOR_MOVE_CTOR() instead of the original code above. And then pass -NVECTOR_MOVE_CTOR to the Wave tool to inhibit expansion of this particular macro. This will defer the expansion of the macro to the actual compiler. I know it's painful, but it's the only viable way. HTH Regards Hartmut --------------- http://boost-spirit.com http://stellar.cct.lsu.edu