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

PrimaryMaintainer
       David F. Skoll (dfs@roaringpenguin.com).

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

   Othercontributors
       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!):

       AndyGlew, for contributing "getc()".

       BrandonBrowning, for suggesting "opened()".

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

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

       RichardJones, 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.

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

       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...]
           Classmethod.   Return a new, unattached scalar handle.  If any arguments are given, they're sent to
           open().

       open [SCALARREF]
           Instancemethod.  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
           Instancemethod.  Is the scalar handle opened on something?

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

   Inputandoutput
       flush
           Instancemethod.  No-op, provided for OO compatibility.

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

       getline
           Instancemethod.  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
           Instancemethod.   Get  all  remaining  lines.   It  will croak() if accidentally called in a scalar
           context.

       print ARGS...
           Instancemethod.  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]
           Instancemethod.   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]
           Instancemethod.  Write some bytes to the scalar.

       sysread BUF, LEN, [OFFSET]
           Instancemethod.  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]
           Instancemethod.  Write some bytes to the scalar.

   Seeking/tellingandotherattributes
       autoflush
           Instancemethod.  No-op, provided for OO compatibility.

       binmode
           Instancemethod.  No-op, provided for OO compatibility.

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

       eof Instancemethod.  Are we at end of file?

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

       sysseek OFFSET, WHENCE
           Instancemethod. Identical to "seek OFFSET, WHENCE", q.v.

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

       use_RS [YESNO]
           Instancemethod.Deprecatedandignored.   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
           Instancemethod.  Set the current position, using the opaque value returned by "getpos()".

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

       sref
           Instancemethod.  Return a reference to the underlying scalar.

       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.

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

       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 v5.32.1                                       2021-09-30                     Test::Builder::IO::Scalar(3pm)

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

       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