No::Worries::Export(3)User Contributed Perl DocumentatioNo::Worries::Export(3)NAMENo::Worries::Export - symbol exporting without worries
SYNOPSIS
use No::Worries::Exportqw(export_control);
sub foo () { ... }
our $bar = 42;
sub import : method {
my($pkg, %exported);
$pkg = shift(@_);
grep($exported{$_}++, qw(foo $bar));
export_control(scalar(caller()), $pkg, \%exported, @_);
}
DESCRIPTION
This module eases symbol exporting by providing a simple yet powerful
alternative to the Exporter module.
The symbols that can be imported are defined in a hash (the third
argument of export_control()), the key being the symbol name and the
value being:
· a scalar: indicating a normal symbol
· a code reference: to be called at import time
The normal symbols can be functions (such as "foo"), scalars (<$foo>),
arrays (<@foo>) or hashes (<%foo>).
All the normal symbols can be imported at once by using an asterisk in
the import code:
use Foo qw(*);
Alternatively, a regular expression can be given to filter what to
import:
# import "foo" and all the normal symbols starting with "bar"
use Foo qw(foo /^bar/);
The special symbols can be used to execute any code. For instance:
# exporting module
our $backend = "stdout";
sub import : method {
my($pkg, %exported);
$pkg = shift(@_);
$exported{syslog} = sub { $backend = "syslog" };
export_control(scalar(caller()), $pkg, \%exported, @_);
}
# importing code
use Foo qw(syslog);
Finally, anything looking like a number will trigger a version check:
use Foo qw(1.2);
# will trigger
Foo->VERSION(1.2);
See UNIVERSAL for more information on the VERSION() mthod.
FUNCTIONS
This module provides the following function (not exported by default):
export_control(CALLERPKG, PKG, EXPORT, NAMES...)
control the symbols exported by the module; this should be called
from an "import" method
SEE ALSO
Exporter, No::Worries.
AUTHOR
Lionel Cons <http://cern.ch/lionel.cons>
Copyright CERN 2012
perl v5.14.3 2012-12-19 No::Worries::Export(3)
