Re: [Swig-user] boost::any with ruby, newbie question

[James17 <jam...@gm...>]

What you will need to do is write a typemap to convert a Ruby Fixnum to a
boost::any type.  I'm not familiar with boost::any, but I just Googled it
and it looks like it can store a number of different types.  In that case,
you will want to write an "in" typemap and will have to write a C++ snippet
of code to detect what Ruby type was provided and then make the appropriate
type conversion at that point.  If you have any overloaded functions that
use this type then you will also need to write a "typecheck" typemap.

See this URL for more info on typemaps:
http://www.swig.org/Doc1.3/Typemaps.html#Typemaps_nn25

And for info on Ruby C type checking and conversion:
http://www.rubycentral.com/pickaxe/ext_ruby.html

-James



Jen Carlile wrote:
> 
> Hi,
> 
> I am doing my first project with both swig and ruby, and I have
> encountered
> a problem that has me scratching my head...
> 
> 
> I wrapped a C++ dll for use with ruby.  A few of the dll functions have
> parameters of the type 'boost::any'.  When I call one of these functions
> from the irb, I get the following error:
> 
> irb(main):011:0> em.RequestSetGlobalData(MCA::KGLoggingLevel, 2)
> TypeError: Expected argument 2 of type boost::any, but got Fixnum 2
>         in SWIG method 'RequestSetGlobalData'
>         from (irb):11:in `RequestSetGlobalData'
>         from (irb):11
> irb(main):012:0>
> 
> The signature of the c++ function is:
> void RequestSetGlobalData(eConferenceAttributes iWhichAttr, boost::any
> iValue);
> 
> 
> Any ideas on how to fix this?  Does the idea of casting exist with ruby?
> 
> Thanks so much
> 
> 
> -Jen Carlile
> 
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