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Howto:Extend Nasal: Difference between revisions
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→A standard interface for mapping C++ classes to Nasal objects
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There's a plan to eventually generalize and unify all those helpers in FGPositioned.cxx and provide them as part of the FGNasalSys class (or some custom abstract base class that C++ classes should implement to expose objects to Nasal), so that they automatically become available to all users of the Nasal subsystem, just by implementing a certain interface. By exposing objects with methods, rather than plain variables, it will be possible to compute results lazily. | There's a plan to eventually generalize and unify all those helpers in FGPositioned.cxx and provide them as part of the FGNasalSys class (or some custom abstract base class that C++ classes should implement to expose objects to Nasal), so that they automatically become available to all users of the Nasal subsystem, just by implementing a certain interface. By exposing objects with methods, rather than plain variables, it will be possible to compute results lazily. | ||
Such an abstract base class should feature: | |||
* virtual constructor to set up: dtor, ghost name, ghost getter | |||
* virtual destructor function to delete Nasal ghosts | |||
* mapping helper to map C++ functions with SG/STL return types to Nasal data structures (std::string, std::vector, std::map) | |||
* lazy getter | |||
* helper: hashset() | |||
* helper: stringToNasal | |||
* helper: to set up valid parents vector for inheritance to work properly | |||
Looking at the code in [http://gitorious.org/fg/flightgear/blobs/78afdb3c2227e75fc1542b3992dcea26181d98cf/src/Scripting/NasalPositioned.cxx#line139 NasalPositioned.cxx]: | Looking at the code in [http://gitorious.org/fg/flightgear/blobs/78afdb3c2227e75fc1542b3992dcea26181d98cf/src/Scripting/NasalPositioned.cxx#line139 NasalPositioned.cxx]: | ||