Revision 10724,
1.0 KB
checked in by ghudson, 27 years ago
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This commit was generated by cvs2svn to compensate for changes in r10723,
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1 | package SelectSaver; |
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2 | |
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3 | =head1 NAME |
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4 | |
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5 | SelectSaver - save and restore selected file handle |
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6 | |
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7 | =head1 SYNOPSIS |
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8 | |
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9 | use SelectSaver; |
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10 | |
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11 | { |
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12 | my $saver = new SelectSaver(FILEHANDLE); |
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13 | # FILEHANDLE is selected |
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14 | } |
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15 | # previous handle is selected |
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16 | |
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17 | { |
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18 | my $saver = new SelectSaver; |
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19 | # new handle may be selected, or not |
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20 | } |
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21 | # previous handle is selected |
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22 | |
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23 | =head1 DESCRIPTION |
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24 | |
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25 | A C<SelectSaver> object contains a reference to the file handle that |
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26 | was selected when it was created. If its C<new> method gets an extra |
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27 | parameter, then that parameter is selected; otherwise, the selected |
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28 | file handle remains unchanged. |
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29 | |
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30 | When a C<SelectSaver> is destroyed, it re-selects the file handle |
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31 | that was selected when it was created. |
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32 | |
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33 | =cut |
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34 | |
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35 | require 5.000; |
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36 | use Carp; |
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37 | use Symbol; |
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38 | |
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39 | sub new { |
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40 | @_ >= 1 && @_ <= 2 or croak 'usage: new SelectSaver [FILEHANDLE]'; |
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41 | my $fh = select; |
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42 | my $self = bless [$fh], $_[0]; |
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43 | select qualify($_[1], caller) if @_ > 1; |
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44 | $self; |
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45 | } |
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46 | |
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47 | sub DESTROY { |
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48 | my $this = $_[0]; |
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49 | select $$this[0]; |
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50 | } |
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51 | |
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52 | 1; |
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