[Rock-dev] Orogen Task Interface Enums

[Alexander Duda]

On Wed, 2011-09-28 at 15:44 +0200, Chris Müller wrote:
> Hi everybody,
> 
> i'm currently writing an orogen module and would like to use for a 
> specific property an enum-like
> structure something like:
> 
> namespace symbols {
> enum Type {
>     SYSTEM, NETWORK
> };
> }
> 
> I'm not sure if its possible to define an Enum in a simple Header file 
> 'enum.h', import its type via
> import_types_from "symbols/Type" and use this in a property and in its
> relating c++ task representation.

should work

> Most of the time the components are controlled via orocos.rb interface.
> 
> Therefore i would probably prefer the ruby-way by using its symbol 
> syntax e.g.:
> 
> task = TaskContext.get "AnyTask"
> task.property = :value

should work 

> 
> It's possible in Ruby to convert any symbol to a String. Therefore the 
> port could be easily described via an /std/string.

:Symbok.to_s 
But I do not understand why you need this.

> 
> I've already tried that out in our current implementation of orocos.rb 
> and unfortanetely i'll get an error:
> `from_ruby': cannot convert system to /std/string (ArgumentError)
> 
> Can we implement an autoconversion for Symbol -> String, if the current 
> property accepts /std/string?
> (or maybe another way to map Symbols to Integers/Enums)
> 
> I know this is a very unimportant issue because we can also use a simple 
> String for that. But it would make the task
> interface a little more ruby-like similar to other famous Ruby APIs.
> 
> Just a simple thought in daily work with ruby & orocos.rb
> 
> Chris
> 
> 
> 
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-- 
Dipl.-Ing. Alexander Duda 
Unterwasserrobotik

DFKI Bremen
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