Re: boost bind/lambda

I've tried

class_<GLfloat, boost::shared_ptr<GLfloat> > ....

but I'm not sure what to do with this. Can you explain? (Luabind's
template blackmagicery is a couple levels above my paygrade).

Thanks!

On Tue, Jan 4, 2011 at 11:26 PM, Nigel Atkinson <[email protected]> wrote:
> You could bind GLfloat as a class.  I've done this in the past with
> Ogre3d's "Real" witch is a typedef for float or double.  Depending on
> how your using in your scripts, that's all you may need to do, i.e
> without any defined methods. This makes GLfloat in scripts similar to an
> opaque pointer, where it's allways come from C++ and only really used by
> C++. You can also add operators and a constructor as well, to get more
> scripting use out of it.
>
> Using it this way as with pointers (arrays) make take a little tweaking,
> I'll have to have a play around when I have time.
>
> Nigel
>
> On Wed, 2011-01-05 at 06:17 +0000, Tony Kostanjsek wrote:
>> I might've been mistaken on the function pointer issue, but I've only used it
>> that way.
>>
>>
>>
>> ----- Ursprüngliche Mail ----
>> Von: beo wulf <[email protected]>
>> An: [email protected]
>> Gesendet: Mittwoch, den 5. Januar 2011, 6:55:19 Uhr
>> Betreff: Re: [luabind] boost bind/lambda
>>
>> Why does wrapping it on a tag_function work then?
>>
>> Writing wrappers is out of the question -- there are too many functions.
>>
>> On Tue, Jan 4, 2011 at 9:51 PM, Tony Kostanjsek <[email protected]> wrote:
>> > "def" requires an address or function pointer, but bind returns a temporary
>> > functor instance. Try to use a static instance or write a wrapper function
>> > implementation and pass that.
>> >
>> > Something like <type> func = bind(...)
>> > .def("glLightfv", &func)
>> > I'm not sure what <type> would look like though.
>> >
>> > Alternatively, something like this might work:
>> > void wrappedGlLightfv(GLenum light, GLenum pname, const
>> > boost::shared_ptr<std::vector<GLfloat>> fv)
>> > {
>> >  glLightfv(light, pname, &fv->get()->front()); // not quite sure about
>> front(),
>> > but you get the idea
>> > }
>> >
>> > ...
>> > .def("glLightfv", wrappedGlLightfv)
>> > ...
>> >
>> > ----- Ursprüngliche Mail ----
>> > Von: beo wulf <[email protected]>
>> > An: [email protected]
>> > Gesendet: Mittwoch, den 5. Januar 2011, 6:35:09 Uhr
>> > Betreff: [luabind] boost bind/lambda
>> >
>> > Goal: I want to luabind all of OpenGL.
>> > Problem: glLightfv( int, int, GLfloat*)
>> >
>> > Almost solution:  boost::bind
>> >
>> > The following code almost works -- it can use boost::bind to convert
>> > functions that take arg GLfloat* to take an arg of
>> > boost::shared_ptr<std::vector<GLfloat>> instead. However, boost::bind
>> > and luabind seem to not work with each other (in particular, the line
>> >
>> > , def("glLightfv2", bind(glLightfv, _1, _2, _3)) // ths line does not compile
>> >
>> > Why?
>> >
>> > Full code below:
>> >
>> >
>> >
>> > #include <boost/shared_ptr.hpp>
>> > #include <boost/bind.hpp>
>> >
>> > #include <vector>
>> > #include <iostream>
>> >
>> > #include <luabind/luabind.hpp>
>> > #include <luabind/operator.hpp>
>> > #include <luabind/adopt_policy.hpp>
>> > #include <luabind/copy_policy.hpp>
>> > #include <luabind/class_info.hpp>
>> >
>> > #include <GL/gl.h>
>> >
>> >
>> >
>> > #define P boost::shared_ptr
>> > #define V std::vector
>> >
>> > float foo(int x, int y, float* f) {
>> >  float ans = 0;
>> >  ans = x + y + f[0] + f[1] + f[2];
>> >  return ans;
>> > }
>> >
>> > float* get_raw(P<V<float> > p) {
>> >  return &((*p)[0]);
>> > }
>> >
>> > void test() { // works fine
>> >  P<V<float> > p(new V<float>());
>> >  p->push_back(1);
>> >  p->push_back(2);
>> >  p->push_back(3);
>> >
>> >  // I want this to output 9
>> >  std::cout << bind(foo, _1, _2, bind(get_raw, _3))(1, 2, p) << std::endl;
>> > }
>> >
>> >
>> > int main() {
>> >  using namespace luabind;
>> >
>> >  lua_State *L;
>> >
>> >  module( L )
>> >    [
>> >    namespace_("gl") [
>> >      def( "glLightfv", glLightfv)
>> >      // Why do these two lines not compile?
>> > //    , def( "glLightfv2", bind(glLightfv, _1, _2, _3))
>> > //    , def( "glLightfv3", bind(glLightfv, _1, _2, bind(get_raw, _3)))
>> >    ]
>> >    ]
>> >
>> >    ;
>> > }
>> >
>> > ------------------------------------------------------------------------------
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>> to consolidate database storage, standardize their database environment, and,
>> should the need arise, upgrade to a full multi-node Oracle RAC database
>> without downtime or disruption
>> http://p.sf.net/sfu/oracle-sfdevnl
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>
>
>
> ------------------------------------------------------------------------------
> Learn how Oracle Real Application Clusters (RAC) One Node allows customers
> to consolidate database storage, standardize their database environment, and,
> should the need arise, upgrade to a full multi-node Oracle RAC database
> without downtime or disruption
> http://p.sf.net/sfu/oracle-sfdevnl
> _______________________________________________
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Learn how Oracle Real Application Clusters (RAC) One Node allows customers
to consolidate database storage, standardize their database environment, and, 
should the need arise, upgrade to a full multi-node Oracle RAC database 
without downtime or disruption
http://p.sf.net/sfu/oracle-sfdevnl