[erlang-questions] help with message-passing syntax

David Mercer <>
Thu Jul 3 17:04:22 CEST 2008


You don’t send messages to functions, you send them to processes.  Also,
you’re missing periods after the squarer and squarer2 functions (after the
ends), which accounts for two of the compiler errors.

 

  _____  

From: 
[mailto:] On Behalf Of not norwegian
swede
Sent: Thursday, July 03, 2008 04:04
To: 
Subject: [erlang-questions] help with message-passing syntax

 


im using:
http://www.erlang.org/doc/reference_manual/part_frame.html
but cant really figure it out. i didnt expect this to work but compiled
anyway:
2> c("c:/Program Files/erl5.6.2/usr/serec", [{outdir, "c:/Program
Files/erl5.6.2/usr/"}]).
c:/Program Files/erl5.6.2/usr/serec.erl:2: function squarer/1 undefined
c:/Program Files/erl5.6.2/usr/serec.erl:2: function squarer2/1 undefined
c:/Program Files/erl5.6.2/usr/serec.erl:23: premature end
error
3> 


obv this is just a toy program but say I have a function that squares the
integers of a list from 1 to the send parameter.
so i want to send a message to that function.


-module(serec).
-export([seq/2,squarer/1,squarer2/1]).
         
seq(Start, End) -> seq(Start, End, []).

seq(Start, End, Acc) when Start =< End ->
   seq(Start, End-1, [End|Acc]);
seq(_, _, Acc) ->
   Acc.

squarer(X) ->
    receive
    Pattern [when Pattern > 7] ->
        [X*X || X <- [seq(1, 7]];
    end

squarer2(X) ->
    receive
    when X > 7 -> [X*X || X <- [seq(1, 7]];
    end

squarer(X) ! 2+6

 

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