[Rock-dev] non linear behaviour of typelib

[Alexander Duda]

the typelib ruby binding has some non linear behaviour if different 
setter and getter are used.

             sample = Types::Base::Samples::Frame::FramePair.new
             time_first = Time.now-1000
             sample.time = Time.now
             sample.first.time = time_first

             #raw access is needed to get the element type
             element = 
sample.first.raw_get_field("attributes").element_t.new

             element.data_ = "payload"
             element.name_ = "first"
             sample.first.attributes <<  element
             element.name_ = "second"

             #the same element is pushed twice
             sample.first.attributes <<  element

             #a copy is pushed
             sample.first.attributes <<  element.dup

             #there are three elements in the array
             sample.first.attributes.size

             #here  the size is 0 because typelib is returning a 
different array which
             #is not up-to-date
             sample.first["attributes"].size
             sample.first.get_field["attributes"].size
             sample.first.get_raw_field["attributes"].size

If the sample is written to a port only two elements will be transferred
because someone is calling uniq on the array which leads to confusion.
Maybe there could be a warning if someone is pushing the same element twice.

Alex

-- 
Dipl.-Ing. Alexander Duda
Unterwasserrobotik

DFKI Bremen
Robotics Innovation Center
Robert-Hooke-Straße 5
28359 Bremen, Germany

Phone: +49 (0)421 178-456620
Fax:   +49 (0)421 178-454150
E-Mail: alexander.duda at dfki.de

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