[gephex-devel] gephex-0.5 unit and linktype templates

[Georg Seidel]

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Hi All,

this is only a rough sketch of an idea I discussed with Martin a few 
times in the past
(originally it is based on martins idea of "higher order" linktypes 
like lists of images).

The basic idea is to introduce a C++ template like mechanism for units 
and linktypes.
There will be a "UnitTemplate" and a LinktypeTemplate" interface that 
allows to
instantiate units and linktypes with different values of template 
parameters.

The following types of  template parameters are allowed:

    1/ linktype (at instantiation this parameter will hold a pointer to 
a linktype interface)
    2/ int
    3 string (0-terminated array of bytes, utf-8)

The interface of UnitTemplate in pseudo code could look like that:

   class UnitTemplate
  {
   public:
      ParameterInfo get_param_info() const;

      Unit* instantiate(ParameterValues params);
  };

Note that the units returned by instantiate might have different number 
and type of
ports depending on the template parameters.
For example, think about a SwitchN template, with a single template 
parameter of
type int (= number of input ports).


Best regards,

Georg
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