blob: 4c4fb8b86bfac5ba906079e9d9c0591ea5c1dffa (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
|
=head1 NAME
base - Establish IS-A relationship with base class at compile time
=head1 SYNOPSIS
package Baz;
use base qw(Foo Bar);
=head1 DESCRIPTION
Roughly similar in effect to
BEGIN {
require Foo;
require Bar;
push @ISA, qw(Foo Bar);
}
This module was introduced with Perl 5.004_04.
=head1 BUGS
Needs proper documentation!
=cut
package base;
sub import {
my $class = shift;
foreach my $base (@_) {
unless (defined %{"$base\::"}) {
eval "require $base";
# Only ignore "Can't locate" errors from our eval require.
# Other fatal errors (syntax etc) must be reported.
die if $@ && $@ !~ /^Can't locate .*? at \(eval /;
unless (defined %{"$base\::"}) {
require Carp;
Carp::croak("Base class package \"$base\" is empty.\n",
"\t(Perhaps you need to 'use' the module ",
"which defines that package first.)");
}
}
}
push @{caller(0) . '::ISA'}, @_;
}
1;
|
