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.IX Title "IO::TieCombine 3"
.TH IO::TieCombine 3 2026-08-26 "perl v5.44.0" "User Contributed Perl Documentation"
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.SH SYNOPSIS
.IX Header "SYNOPSIS"
First, we set up a bunch of access points:
.PP
.Vb 1
\&  my $hub = IO::TieCombine\->new;
\&
\&  my $str_ref  = $hub\->scalar_ref(\*(Aqx\*(Aq);
\&  my $fh       = $hub\->fh(\*(Aqx\*(Aq);
\&  my $callback = $hub\->callback(\*(Aqx\*(Aq);
\&
\&  tie my $scalar, $hub, \*(Aqx\*(Aq;
\&  tie local *STDOUT, $hub, \*(Aqx\*(Aq;
\&
\&  tie local *STDERR, $hub, \*(Aqerr\*(Aq;
.Ve
.PP
Then we write to things:
.PP
.Vb 6
\&  $$str_ref .= \*(AqAnd \*(Aq;
\&  print $fh "now ";
\&  $callback\->(\*(Aqfor \*(Aq);
\&  $scalar .= \*(Aqsomething \*(Aq;
\&  print "completely ";
\&  warn "different.\en";
.Ve
.PP
And then:
.PP
.Vb 3
\&  $hub\->combined_contents;    # And now for something completely different.
\&  $hub\->slot_contents(\*(Aqx\*(Aq);   # And now for something completely
\&  $hub\->slot_contents(\*(Aqerr\*(Aq); # different.
.Ve
.PP
\&\fBACHTUNG!!\fR  Because of a serious problem with Perl 5.10.0, output sent to a
tied filehandle using \f(CW\*(C`say\*(C'\fR \fBwill not have the expected newline\fR.  5.10.1 or
later is needed.  Since 5.10.0 is broken in so many other ways, you should
really upgrade anyway.
.PP
\&\fBACHTUNG!!\fR  Because of a different problem with Perls 5.10.1 \- 5.16.3, if you
send output to a tied filehandle using \f(CW\*(C`say\*(C'\fR, and \f(CW\*(C`$\e\*(C'\fR is undefined (which is
the default), \fR\f(CB\*(C`$\e\*(C'\fR\fB will not be restored to \fR\f(CB\*(C`undef\*(C'\fR\fB after the \fR\f(CB\*(C`say\*(C'\fR\fB\fR!
This means that once you\*(Aqve used \f(CW\*(C`say\*(C'\fR to print to \fIany\fR tied filehandle, you
have corrupted the global state of your program.  Either start your program by
setting \f(CW\*(C`$\e\*(C'\fR to an empty string, which should be safe, or upgrade to 5.18.0.
.PP
The constructor takes no arguments.
.PP
This method returns the contents of all collected data.
.PP
.Vb 1
\&  my $str = $hub\->slot_contents( $slot_name );
.Ve
.PP
This method returns the contents of all collected data for the named slot.
.PP
.Vb 1
\&  $hub\->clear_slot( $slot_name );
.Ve
.PP
This sets the slot back to an empty string.
.PP
.Vb 1
\&  my $fh = $hub\->fh( $slot_name );
.Ve
.PP
This method returns a reference to a tied filehandle.  When printed to, output
is collected in the named slot.
.PP
.Vb 1
\&  my $str_ref = $hub\->scalar_ref( $slot_name );
.Ve
.PP
This method returns a reference to scalar.  When appended to, the new content
is collected in the named slot.  Attempting to alter the string other than by
adding new content to its end will result in an exception.
.PP
.Vb 1
\&  my $code = $hub\->callback( $slot_name );
.Ve
.SH "POD ERRORS"
.IX Header "POD ERRORS"
Hey! \fBThe above document had some coding errors, which are explained below:\fR
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