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Howto:Extend Nasal

927 bytes added, 16:24, 1 March 2013
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{{Template:Nasal Internals}}
== Status (cppbind) ==
As of 03/2013, this article should be considered depreciated, we have a new C++-based API for exposing C/C++ functions/data structures to Nasal and vice versa in [https://gitorious.org/fg/simgear/trees/next/simgear/nasal/cppbind $SG_SRC/nasal/cppbind]. Usually, there should be no need to use the bare Nasal APIs anymore for exposing functions/data to Nasal or Nasal-space types to C++, except for people working on the '''cppbind''' framework itself.
The cppbind framework is much more generic and high level than the bare APIs, it includes unit testing support and makes use of modern C++ features like templates and STL support, including SimGear specific types like SGPath etc, its overhead is fairly small (not just performance, but also LoC to create new bindings).
The cppbind framework is already extensively used by the [[Canvas]] system, which is a good place to look for code examples.
== Scope ==
This article is dedicated to describing how to write custom C/C++ extension functions in order to extend the [[Nasal]] scripting interpreter in FlightGear, for example in order to expose new or existing FlightGear APIs to the Nasal scripting engine, so that Nasal scripts can access additional FlightGear internals.

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