SEARCH
NEW RPMS
DIRECTORIES
ABOUT
FAQ
VARIOUS
BLOG
DONATE


YUM REPOSITORY

 
 

MAN page from RedHat EL 4 perl-Filter-1.34-1.el4.rf.i386.rpm

Filter::cpp

Section: User Contributed Perl Documentation (3)
Updated: 2001-02-18
Index 

NAME

Filter::cpp - cpp source filter 

SYNOPSIS

    use Filter::cpp ;
 

DESCRIPTION

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

As with all source filters its scope is limited to the current sourcefile 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\n" ;    #ifdef FRED    print "Hello FRED\n" ;    #else    print "Where is FRED\n" ;    #endif

And here is what it will output:

    a = 3    Hello FRED

This example below, provided by Michael G Schwern, shows a clever wayto get Perl to use a C pre-processor macro when the Filter::cpp moduleis 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."\n")    }

    PRINT("Mu");

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

AUTHOR

Paul Marquess  

DATE

11th December 1995.


 

Index

NAME
SYNOPSIS
DESCRIPTION
AUTHOR
DATE

This document was created byman2html,using the manual pages.