filter::cpp(3) [redhat man page]

Filter::cpp(3)						User Contributed Perl Documentation					    Filter::cpp(3)

NAME

       Filter::cpp - cpp source filter

SYNOPSIS

	   use Filter::cpp ;

DESCRIPTION

       This source filter pipes the current source file through the C pre-processor (cpp) if it is available.

       As with all source filters its scope is limited to the current source file only. Every file you want to be processed by the filter must
       have a

	   use Filter::cpp ;

       near the top.

       Here is an example script which uses the filter:

	   use Filter::cpp ;

	   #define FRED 1
	   $a = 2 + FRED ;
	   print "a = $a
" ;
	   #ifdef FRED
	   print "Hello FRED
" ;
	   #else
	   print "Where is FRED
" ;
	   #endif

       And here is what it will output:

	   a = 3
	   Hello FRED

       This example below, provided by Michael G Schwern, shows a clever way to get Perl to use a C pre-processor macro when the Filter::cpp mod-
       ule is available, or to use a Perl sub when it is not.

	   # use Filter::cpp if we can.
	   BEGIN { eval 'use Filter::cpp' }

	   sub PRINT {
	       my($string) = shift;

	   #define PRINT($string) 
	       (print $string."
")
	   }

	   PRINT("Mu");

       Look at Michael's Tie::VecArray module for a practical use.

AUTHOR

       Paul Marquess

DATE

       11th December 1995.

perl v5.8.0							    2003-01-27							    Filter::cpp(3)

cxref-cpp(1)						      General Commands Manual						      cxref-cpp(1)

NAME

       cxref-cpp - A modified C preprocessor to use with cxref.

SYNOPSIS

       cxref-cpp ...

DESCRIPTION

       To  improve  the  output  that  is available for the source code for cross-referencing a modified version of the GNU CPP v2.7.2 is supplied
       (named cxref-cpp).

       This modified C preprocessor allows for a finer control over some features of the preprocessing that are not important for a compiler.	In
       a  standard  preprocessor, the preprocessor directives are intended for use only by the preprocessor, so passing the information through is
       not important.

       With cxref-cpp, there are some features that are different to the standard GNU CPP:

	      Compared to gcc versions earlier than version 2.8.0 there is an extra option that will output the #include  lines  from  the  source
	      file.  In version 2.8.0 and later this option is present.

	      Comments	trailing  a  #include  or  a  #define are not preserved by all versions of gcc even if the -C option is used.  This is not
	      important while compiling, but is useful for documenting.

	      The cxref-cpp program will take on the personality of the installed version of gcc so that the gcc header files can be parsed.  This
	      means  that it includes the same default include directory paths and macro definitions.  The file that contains these definitions is
	      called cxref-cpp.defines and is installed by the cxref-cpp-configure program or specified by  the  -cxref-cpp-defines  command  line
	      option.

OPTIONS

       The same as for gcc, apart from '-cxref-cpp-defines' described above.

SEE ALSO

       cxref(1), cxref-cpp-configure(1), gcc(1)

								    May 9, 2004 						      cxref-cpp(1)