On 01/21/2014 04:20 PM, pmenso57@comcast.net wrote:
Eric, just be very careful about what macros expand when. E.g. the expression:
!defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
will get expanded on the first preprocessor pass to something like
!defined(1)
(or whatever it expands to)
Thanks for the warning, and that makes sense, but it's not what I'm seeing. I'm seeing wave spit out:
# if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
instead of:
# if !defined(1)
Why would that be? Regardless, I can turn off expansion of this macro during preprocessing with wave's -N switch, so there's a fix should I ever need it.
Turning off the expansion of macros used in #if conditions can cause all kind of trouble. All depends on what is inside the wave pragmas: // this stuff will be seen by wave but not generated #pragma wave option(output:file) // this stuff will be preprocessed and written to 'file' #pragma wave option(output:null) // this stuff will be seen by wave but not generated So if it gets expanded outside of the pragma region all is fine. Did I misunderstand something? Regards Hartmut --------------- http://boost-spirit.com http://stellar.cct.lsu.edu