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Howto:Extend Nasal: Difference between revisions
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== A standard interface for mapping C++ classes to Nasal objects == | == A standard interface for mapping C++ classes to Nasal objects == | ||
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. | 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. | ||
Looking at the code in | Looking at the code in [http://gitorious.org/fg/flightgear/blobs/78afdb3c2227e75fc1542b3992dcea26181d98cf/src/Scripting/NasalPositioned.cxx#line139 NasalPositioned.cxx]: | ||
The function bodies for these helpers are largely identical: | The function bodies for these helpers are largely identical: | ||
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<syntaxhighlight lang="cpp"> | <syntaxhighlight lang="cpp"> | ||
class FGPositioned : public SGReferenced, public | class FGPositioned : public SGReferenced, public FGNasalWrapper { | ||
// ... | |||
}; | |||
</syntaxhighlight> | </syntaxhighlight> | ||