NAME
constant::boolean - Define TRUE and FALSE constants.
SYNOPSIS
use constant::boolean;
use File::Spec;
sub is_package_exist {
my ($package) = @_;
return FALSE unless defined $package;
foreach my $inc (@INC) {
my $filename = File::Spec->catfile(
split( /\//, $inc ), split( /\::/, $package )
) . '.pm';
return TRUE if -f $filename;
};
return FALSE;
};
no constant::boolean;
DESCRIPTION
Defines `TRUE' and `FALSE' constants in caller's namespace. You could use simple values like empty string or zero for false, or any non-empty and non-zero string value as true, but the `TRUE' and `FALSE' constants are more descriptive.
It is virtually the same as:
# double "not" operator is used for converting scalar to boolean value
use constant TRUE => !! 1;
use constant FALSE => !! '';
The constants exported by `constant::boolean' are not reported by Test::Pod::Coverage, so it is more convenient to use this module than to define `TRUE' and `FALSE' constants by yourself.
The constants can be removed from class API with `no constant::boolean' pragma or some universal tool like namespace::clean.
AUTHOR
Piotr Roszatycki <dexter@cpan.org>
LICENSE
Copyright 2008, 2009 by Piotr Roszatycki <dexter@cpan.org>.
This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.