Re: Pass int64

Hmmm....that's ugly.  Honestly, since lua uses ptrdiff_t for its integer
type, depending on platform you may have data loss.  If you are on a 64
bit version of windows ( I assume windows as __int64 is a MS thing...and
not ANSI, and not on linux, unix ) you should be ok.

However, it means you need to derive from the class RawData and overload
the members to call the parent and use a variadic return
type...something like:

class MyRawData : public RawData
{
   typedef RawData    parent;

MyRawData( ptrdiff_t v ) : parent(v) { }
 //..
 ptrdiff_t getSize() { return this->parent::getSize(); }

};

I'm sure there is a better/slicker way to achieve it, but this would be
the long typed, least thought out approach ;)

-tom

On Tue, 2009-05-26 at 16:51 +0300, Valery wrote:

>  
> 
> Tom, Thanks, 
>  
> Yes, your variant works. But what should I do if my class has get
> method like:
> __int64 getSize();
>  
> .cpp
> luabind::class_<RawData, boost::shared_ptr<RawData> >("RawData" )
>     .def( luabind::constructor<int>() )
>     .def("getSize", &RawData::getSize) 
>  
> .lua
> RawData(10):getSize()
>  
> I get "you are trying to use an unregistered type".
>  
> I tryed something like the next, but I cannot use 'type'. 
> luabind::class_< __int64 > ("Int64")
>  
> Thanks,
> Valery.
>  
> ----- Original Message ----- 
> 
> From: Tom McCubbin 
> To: [email protected] 
> Sent: Tuesday, May 26, 2009 3:51 PM
> Subject: Re: [luabind] Pass int64
> 
> 
> 
> If the constructor is not explicit (not marked as so below), why not
> try and change your luabind::constructor<>()  to take an int, and let
> the compiler do its 1 allowed conversion step.  At runtime luabind
> doesn't have the smarts to map a number to __int64 in looking up the
> constructor would be my guess as to why you have the problem.
> 
> luabind::class_<RawData, boost::shared_ptr<RawData> >("RawData" )
>     .def( luabind::constructor<int>() ); //...
> 
> That or derive and add a new signature for int.
> 
> 
> On Tue, 2009-05-26 at 14:32 +0300, Valery wrote: 
> 
> > Hello,
> > 
> > I have a class that gets __int64 as a parameter in the constructor. I am 
> > trying to create it from lua, but get the error "FAIL: Test: no constructor 
> > of 'RawData' matched the arguments (number)
> >  candidates are:
> > RawData(custom [__int64])"
> > 
> > Could anybody help?
> > 
> > .cpp
> > class RawData {
> >  public: RawData(__int64) {}
> > };
> > luabind::class_<RawData, boost::shared_ptr<RawData> >("RawData")
> >  .def(luabind::constructor<__int64>())
> > 
> > .lua
> > x=RawData(10)
> > 
> > Thanks,
> > Valery. 
> > 
> > 
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