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MathGroup Archive 2005

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Putting the same function name in multiple modules.

  • To: mathgroup at smc.vnet.net
  • Subject: [mg54779] Putting the same function name in multiple modules.
  • From: Josef Karthauser <joe at tao.org.uk>
  • Date: Tue, 1 Mar 2005 01:58:41 -0500 (EST)
  • Sender: owner-wri-mathgroup at wolfram.com

I'm trying to do a bit of "object orientation" with a number of modules
and was wondering what the official way of doing it was.

Imagine that I've got a couple of data types defined.  Let us call them
FooA[] and FooB[].  Each has it's own module, so that I can do something
like:

    Needs["`FooA`"];
    Needs["`FooB`"];

What I want is a function that can operate on both types, i.e.

    Doit[x_FooA] := ...

and

    Doit[x_FooB] := ...

and would like to define each of these in the relevant module.

I would normally do something like:

    Module[... FooA ...]

    Doit::usage = "....";

    Begin["`Private`"];
    Doit[x_FooA] := ...;
    End[];

and

    Module[... FooB ...]

    Doit::usage = "....";

    Begin["`Private`"];
    Doit[x_FooB] := ...;
    End[];

Of course doing it this way each of the Doit[] functions is defined in a
different context and so one of them gets overriden by the other.

Does anyone know how I can fix things so that I can say make a FooC
module and define a Doit[x_FooC] in it without having to change the FooA
and FooB modules to accomodate it.

Thanks,
Joe
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