[erlang-questions] clarify: Sending big messages

Bill McKeeman <>
Wed Oct 22 16:42:09 CEST 2008


The Armstrong book says

A ! B ! C ! msg

is convenient when one message must go several places.  It seems simple enough to add a line with void or ok to your function if that is what you want.

/s/ Bill

________________________________
From:  [mailto:] On Behalf Of Robert Virding
Sent: Wednesday, October 22, 2008 10:26 AM
To: Kostis Sagonas
Cc: 
Subject: Re: [erlang-questions] clarify: Sending big messages

2008/10/22 Kostis Sagonas <<mailto:>>
Zoltan Peter Toth wrote:
> Hi,
>
> We have a function like this:
>
> deliver(Port, Data) ->
>     Port ! {data, Data}.
>
> This function returns Data.

Nope.  This function returns {data, Data}.

I personally think that !/2 returning a value instead of being void as
it should, is a design flow in the definition of the language. (*)

Trouble is there is no void data type and every expression must return a value. So we decided that as it must return something it might as well return something useful, so why not the message? Personally I think this is better than returning 'ok' or 'void'.

How would you handle a void return anyway? Can you put in a tuple and send it? Or just return it and never use it, except to return it again as in the deliver example.

Robert
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