Re: boost bind/lambda

You shouldn't use boost::shared_ptr to store things allocated with new[], shared_ptr  will call delete not delete[] on your array which isn't good, I don't know if lua bind supports it but boost::shared_array is what you should be using here

-----Original Message-----
From: Nigel Atkinson [mailto:[email protected]] 
Sent: 05 January 2011 10:55
To: [email protected]
Subject: Re: [luabind] boost bind/lambda

You're on the right track.  Perhaps an example will help (and let me make sure it works as advertised!) Attached is a little program which I've tested with gcc 4 and luabind 0.9.  I've added a couple of comments.

It should work if GLfloat is a #define rather than a typedef, but I've just checked on my machine (Linux), and it is a typedef.

On another note, if you are binding all of OpenGL, are you going to do extensions?  That could be curly! Bound function pointers? That *might* work perhaps. Hmmm.

Nigel

On Tue, 2011-01-04 at 23:44 -0800, beo wulf wrote:
> 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 
> > C++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)))
> >> >    ]
> >> >    ]
> >> >
> >> >    ;
> >> > }
> >> >
> >> > -----------------------------------------------------------------
> >> > ------------- Learn how Oracle Real Application Clusters (RAC) 
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> >
> > --------------------------------------------------------------------
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> > 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 
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> >
> 
> ----------------------------------------------------------------------
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> 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
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