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Test::Builder::IO::ScaUser3Contributed Perl DocuTest::Builder::IO::Scalar(3pm)

NAME
       Test::Builder::IO::Scalar - A copy of IO::Scalar for Test::Builder

DESCRIPTION
       This is a copy of IO::Scalar which ships with Test::Builder to support
       scalar references as filehandles on Perl 5.6.  Newer versions of Perl
       simply use "<open()">'s built in support.

       Test::Builder can not have dependencies on other modules without
       careful consideration, so its simply been copied into the distribution.

COPYRIGHT and LICENSE
       This file came from the "IO-stringy" Perl5 toolkit.

       Copyright (c) 1996 by Eryq.  All rights reserved.  Copyright (c)
       1999,2001 by ZeeGee Software Inc.  All rights reserved.

       This program is free software; you can redistribute it and/or modify it
       under the same terms as Perl itself.

   Construction
       new [ARGS...]
	   Class method.  Return a new, unattached scalar handle.  If any
	   arguments are given, they're sent to open().

       open [SCALARREF]
	   Instance method.  Open the scalar handle on a new scalar, pointed
	   to by SCALARREF.  If no SCALARREF is given, a "private" scalar is
	   created to hold the file data.

	   Returns the self object on success, undefined on error.

       opened
	   Instance method.  Is the scalar handle opened on something?

       close
	   Instance method.  Disassociate the scalar handle from its
	   underlying scalar.  Done automatically on destroy.

   Input and output
       flush
	   Instance method.  No-op, provided for OO compatibility.

       getc
	   Instance method.  Return the next character, or undef if none
	   remain.

       getline
	   Instance method.  Return the next line, or undef on end of string.
	   Can safely be called in an array context.  Currently, lines are
	   delimited by "\n".

       getlines
	   Instance method.  Get all remaining lines.  It will croak() if
	   accidentally called in a scalar context.

       print ARGS...
	   Instance method.  Print ARGS to the underlying scalar.

	   Warning: this continues to always cause a seek to the end of the
	   string, but if you perform seek()s and tell()s, it is still safer
	   to explicitly seek-to-end before subsequent print()s.

       read BUF, NBYTES, [OFFSET]
	   Instance method.  Read some bytes from the scalar.  Returns the
	   number of bytes actually read, 0 on end-of-file, undef on error.

       write BUF, NBYTES, [OFFSET]
	   Instance method.  Write some bytes to the scalar.

       sysread BUF, LEN, [OFFSET]
	   Instance method.  Read some bytes from the scalar.  Returns the
	   number of bytes actually read, 0 on end-of-file, undef on error.

       syswrite BUF, NBYTES, [OFFSET]
	   Instance method.  Write some bytes to the scalar.

   Seeking/telling and other attributes
       autoflush
	   Instance method.  No-op, provided for OO compatibility.

       binmode
	   Instance method.  No-op, provided for OO compatibility.

       clearerr
	   Instance method.  Clear the error and EOF flags.  A no-op.

       eof Instance method.  Are we at end of file?

       seek OFFSET, WHENCE
	   Instance method.  Seek to a given position in the stream.

       sysseek OFFSET, WHENCE
	   Instance method. Identical to "seek OFFSET, WHENCE", q.v.

       tell
	   Instance method.  Return the current position in the stream, as a
	   numeric offset.

       use_RS [YESNO]
	   Instance method.  Deprecated and ignored.  Obey the current setting
	   of $/, like IO::Handle does?	 Default is false in 1.x, but cold-
	   welded true in 2.x and later.

       setpos POS
	   Instance method.  Set the current position, using the opaque value
	   returned by "getpos()".

       getpos
	   Instance method.  Return the current position in the string, as an
	   opaque object.

       sref
	   Instance method.  Return a reference to the underlying scalar.

WARNINGS
       Perl's TIEHANDLE spec was incomplete prior to 5.005_57; it was missing
       support for "seek()", "tell()", and "eof()".  Attempting to use these
       functions with an IO::Scalar will not work prior to 5.005_57.
       IO::Scalar will not have the relevant methods invoked; and even worse,
       this kind of bug can lie dormant for a while.  If you turn warnings on
       (via $^W or "perl -w"), and you see something like this...

	   attempt to seek on unopened filehandle

       ...then you are probably trying to use one of these functions on an
       IO::Scalar with an old Perl.  The remedy is to simply use the OO
       version; e.g.:

	   $SH->seek(0,0);    ### GOOD: will work on any 5.005
	   seek($SH,0,0);     ### WARNING: will only work on 5.005_57 and beyond

VERSION
       $Id: Scalar.pm,v 1.6 2005/02/10 21:21:53 dfs Exp $

AUTHORS
   Primary Maintainer
       David F. Skoll (dfs@roaringpenguin.com).

   Principal author
       Eryq (eryq@zeegee.com).	President, ZeeGee Software Inc
       (http://www.zeegee.com).

   Other contributors
       The full set of contributors always includes the folks mentioned in
       "CHANGE LOG" in IO::Stringy.  But just the same, special thanks to the
       following individuals for their invaluable contributions (if I've
       forgotten or misspelled your name, please email me!):

       Andy Glew, for contributing "getc()".

       Brandon Browning, for suggesting "opened()".

       David Richter, for finding and fixing the bug in "PRINTF()".

       Eric L. Brine, for his offset-using read() and write() implementations.

       Richard Jones, for his patches to massively improve the performance of
       "getline()" and add "sysread" and "syswrite".

       B. K. Oxley (binkley), for stringification and inheritance
       improvements, and sundry good ideas.

       Doug Wilson, for the IO::Handle inheritance and automatic tie-ing.

SEE ALSO
       IO::String, which is quite similar but which was designed more-recently
       and with an IO::Handle-like interface in mind, so you could mix OO- and
       native-filehandle usage without using tied().

       Note: as of version 2.x, these classes all work like their IO::Handle
       counterparts, so we have comparable functionality to IO::String.

perl v5.10.1			  2011-02-23	Test::Builder::IO::Scalar(3pm)
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