Re: Trouble binding a class - should be simple

Please try v*:*getX().

On 5 May 2011 15:56, Simon Pickles <[email protected]> wrote:

>
> Hello,
>
> I am trying to expose part of the btVector3 class from BulletPhysics to
> Lua:
>
> http://www.bulletphysics.com/Bullet/BulletFull/classbtVector3.html
>
> My first attempt:
>
> // C++
>   void RegisterPhysicsTypesWithLua( lua_State* lua )
>   {
>     module( lua )
>     [
>       class_<btVector3>( "btVector3" )
>       .def( "getX",&btVector3::getX )
>       .def( "getY",&btVector3::getY )
>       .def( "getZ",&btVector3::getZ )
>       .def( "setX",&btVector3::setX )
>       .def( "setY",&btVector3::setY )
>       .def( "setZ",&btVector3::setZ )
>     ];
>   }
>
> --Lua
> print("Testing btVector3 in lua")
> v = btVector3()
> print("btVector3 created")
>
> print( "x = " .. v.getX() )  -- should print x = 0.0
> v.setX(99.9)
> print( "x = " .. v.getX() )  -- should print x = 99.9
>
> ------------------------------------------
> This first attempt produces the error:
> "Attempt to call a nil value"
>
>
> So I added a constructor and tried again:
>
> // C++
>   void RegisterPhysicsTypesWithLua( lua_State* lua )
>   {
>     module( lua )
>     [
>       class_<btVector3>( "btVector3" )
>       .def( constructor<  float, float, float>() )
>       .def( "getX",&btVector3::getX )
>       .def( "getY",&btVector3::getY )
>       .def( "getZ",&btVector3::getZ )
>       .def( "setX",&btVector3::setX )
>       .def( "setY",&btVector3::setY )
>       .def( "setZ",&btVector3::setZ )
>     ];
>   }
>
> --Lua
> print("Testing btVector3 in lua")
> v = btVector3(1.0,2.0,3.0)
> print("btVector3 created")
>
> print( "x = " .. v.getX() )  -- should print x = 1.0
> v.setX(99.9)
> print( "x = " .. v.getX() )  -- should print x = 99.9
>
> ------------------------------------------
> This second attempt produces the error:
> "No such operator defined"
>
>
> I have double checked that I am definately calling the
> RegisterPhysicsTypesWithLua with the correct LuaState.
>
> I expected this to be reasonably trivial as I have been exposing my own
> classes with ease. This is however, the first time I have tried to
> expose a 3rd party class. Am I missing something obvious?
>
> Thanks very much
>
> Simon
>
>
>
>
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