Re: boost bind/lambda

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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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