sam-t2/devtools/amd64/man/man3/base.3

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.\" ========================================================================
.\"
.IX Title "base 3"
.TH base 3 "2001-09-21" "perl v5.8.8" "Perl Programmers Reference Guide"
.SH "NAME"
base \- Establish IS\-A relationship with base classes at compile time
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 2
\&    package Baz;
\&    use base qw(Foo Bar);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
Allows you to both load one or more modules, while setting up inheritance from
those modules at the same time.  Roughly similar in effect to
.PP
.Vb 6
\&    package Baz;
\&    BEGIN {
\&        require Foo;
\&        require Bar;
\&        push @ISA, qw(Foo Bar);
\&    }
.Ve
.PP
If any of the listed modules are not loaded yet, \fIbase\fR silently attempts to
\&\f(CW\*(C`require\*(C'\fR them (and silently continues if the \f(CW\*(C`require\*(C'\fR failed).  Whether to
\&\f(CW\*(C`require\*(C'\fR a base class module is determined by the absence of a global variable
\&\f(CW$VERSION\fR in the base package.  If \f(CW$VERSION\fR is not detected even after loading
it, <base> will define \f(CW$VERSION\fR in the base package, setting it to the string
\&\f(CW\*(C`\-1, set by base.pm\*(C'\fR.
.PP
Will also initialize the fields if one of the base classes has it.
Multiple inheritence of fields is \fB\s-1NOT\s0\fR supported, if two or more
base classes each have inheritable fields the 'base' pragma will
croak.  See fields, public and protected for a description of
this feature.
.SH "DIAGNOSTICS"
.IX Header "DIAGNOSTICS"
.ie n .IP "Base class package ""%s"" is empty." 4
.el .IP "Base class package ``%s'' is empty." 4
.IX Item "Base class package %s is empty."
base.pm was unable to require the base package, because it was not
found in your path.
.SH "HISTORY"
.IX Header "HISTORY"
This module was introduced with Perl 5.004_04.
.SH "CAVEATS"
.IX Header "CAVEATS"
Due to the limitations of the implementation, you must use
base \fIbefore\fR you declare any of your own fields.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
fields