# phpman > man > Data::Stream::Bulk::Cat(3pm)

## NAME
    [Data::Stream::Bulk::Cat](https://www.chedong.com/phpMan.php/perldoc/Data%3A%3AStream%3A%3ABulk%3A%3ACat/markdown) - Concatenated streams

## VERSION
    version 0.11

## SYNOPSIS
            use [Data::Stream::Bulk::Cat](https://www.chedong.com/phpMan.php/perldoc/Data%3A%3AStream%3A%3ABulk%3A%3ACat/markdown);

            [Data::Stream::Bulk::Cat](https://www.chedong.com/phpMan.php/perldoc/Data%3A%3AStream%3A%3ABulk%3A%3ACat/markdown)->new(
                    streams => [ $s1, $s2, $s3 ],
            );

## DESCRIPTION
    This stream is a concatenation of several other streams.

## METHODS
    is_done
        Returns true if the list of streams is empty.

    next
        Returns the next block from the next ready stream.

    list_cat
        Breaks down the internal list of streams, and delegates "list_cat" to the first one.

        Has the effect of inlining the nested streams into the total concatenation, allowing
        "list_cat" in [Data::Stream::Bulk::Array](https://www.chedong.com/phpMan.php/perldoc/Data%3A%3AStream%3A%3ABulk%3A%3AArray/markdown) to work better.

## AUTHOR
    Yuval Kogman <<nothingmuch@woobling.org>>

## COPYRIGHT AND LICENSE
    This software is copyright (c) 2012 by Yuval Kogman.

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