Re^5: Problems with forking, Re^3: Loading a module at runtime, Re: mention a non-installed module in script, Re: constants wont optimize, Re^3: How to have OS specific code sections in Perl, Re: Variable as module name? (modern perl), Re^2: Redefining Imported Subs: of scope and no, use Module::Implementation

use constant DEBUG => !!( 0 || $ENV{PERL_DEBUG_MYAPPNAME} );
use if DEBUG , qw' Carp::Always ';

use Perl::OSType qw' is_os_type ';
use if is_os_type('Windows'), qw' Win32::SerialPort ';
use if not is_os_type('Windows'), qw' Device::SerialPort ';

use if eval { require mod; 1 }, qw' constant haveMod 1 ';
use if not exist $INC{'mod.pm'}, qw' constant haveMod 0 ';
use if not exist $INC{'MIDI/ALSA.pm'}, 'something::else', ...;

perl -we " use if eval{require CGI}, our $cgi = 'CGI'; print $cgi->new
+->header "

perl -le " use if $ENV{maplat_debug}, lib => 666; print for @INC"

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In reply to Re: How do you use the if pragma? by Anonymous Monk
in thread How do you use the if pragma? by qazwart

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