I've googled, searched CPAN, and SuperSearched, but I don't think anyone's ever asked about this before. I want to take N coderefs, and create a new subroutine out of them by chaining one to the next within the same callframe. The idea would be something like: 
my $new_sub = chain( $foo, \&bar, $baz );

# Would result in something that behaves similarly to:
$new_sub = sub {
    @_ = $foo->( @_ );
    @_ = bar( @_ );
    $baz->( @_ );
}

# Or like:
$new_sub = sub {
    $baz->( bar( $foo->( @_ ) ) );
}

[download]
The difference I'm looking for is that everything would happen within the same callframe. I want this for two reasons:
  1. There is a slight performance gain when you're dealing with more than 3-4 subroutines
  2. Debugging is much clearer because your callstack only has the subroutine called by the client and not all the intermediate subroutines.
My criteria for good software:
  1. Does it work?
  2. Can someone else come in, make a change, and be reasonably certain no bugs were introduced?

In reply to Composing or chaining subroutines by dragonchild

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