The BOOST_PP_LIMIT_REPEAT macro
      defines the maximum number of repetitions supported by each BOOST_PP_REPEAT
      dimension. 
    Usage
     BOOST_PP_LIMIT_REPEAT 
    Remarks
     This macro current expands to 256.
      
      NOTE: for the current latest versions of Microsoft's VC++ compiler there
      is a nested macro limit of 256. This means in actuality that the number of
      repetitions using VC++ is actually less than 256 depending on the
      repetition macro being used. For the BOOST_PP_REPEAT macro this limit
      appears to be 252 while for the BOOST_PP_ENUM... series of macros this
      limit appears to be around 230, before the VC++ compiler gives a "C1009:
      compiler limit : macros nested too deeply" error. This is a compiler
      limitation of VC++ which may vary depending on the specific repetition
      macro being used, and therefore is not a problem the preprocessor library
      can solve.
    Requirements