The BOOST_PP_LIMIT_MAG macro
      defines the maximum input and result magnitudes of arithmetic. 
    Usage
     BOOST_PP_LIMIT_MAG 
    Remarks
     This macro expands by default to 256. For a C++
      standard conforming preprocessor, the end-user can change this to
      512 or 1024 by defining this macro to either value before
      including any library headers.
    Requirements
    
    See also