7 IO::Seekable - supply seek based methods for I/O objects
12 package IO::Something;
13 @ISA = qw(IO::Seekable);
17 C<IO::Seekable> does not have a constuctor of its own as is intended to
18 be inherited by other C<IO::Handle> based objects. It provides methods
19 which allow seeking of the file descriptors.
21 If the C functions fgetpos() and fsetpos() are available, then
22 C<IO::File::getpos> returns an opaque value that represents the
23 current position of the IO::File, and C<IO::File::setpos> uses
24 that value to return to a previously visited position.
26 See L<perlfunc> for complete descriptions of each of the following
27 supported C<IO::Seekable> methods, which are just front ends for the
28 corresponding built-in functions:
37 L<perlop/"I/O Operators">,
43 Derived from FileHandle.pm by Graham Barr E<lt>bodg@tiuk.ti.comE<gt>
50 use vars qw($VERSION @EXPORT @ISA);
51 use IO::Handle qw(SEEK_SET SEEK_CUR SEEK_END);
54 @EXPORT = qw(SEEK_SET SEEK_CUR SEEK_END);
60 @_ == 1 or croak 'usage: $fh->clearerr()';
61 seek($_[0], 0, SEEK_CUR);
65 @_ == 3 or croak 'usage: $fh->seek(POS, WHENCE)';
66 seek($_[0], $_[1], $_[2]);
70 @_ == 1 or croak 'usage: $fh->tell()';