From: Jason Roelofs <jameskilton@...>
Date: 2008-01-12T04:42:39+09:00
Subject: Re: Using ruby.h to generate C++ vectors and maps

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On Jan 11, 2008 2:12 PM, Edward Liu <liu_edward@emc.com> wrote:

> I am trying to use ruby.h to extend Ruby with C/C++.  I understand how
> to deal with numbers and strings, but I am having trouble finding
> documentation about vectors and maps.  Let's say I have this function
> for example:
>
> VALUE read_values(VALUE self, VALUE object);
>
> The 'object' variable can represent either a Ruby array or a Ruby hash.
> If it is a Ruby array, I want to translate it to a vector.  If it is a
> Ruby hash, I want to translate it to a map.  I know for integers, there
> is a macro called NUM2INT that converts a Ruby number into a C/C++
> integer.  For strings, I know that the function StringValueCStr does
> what I want.  I couldn't find it in the ruby.h documentation, but is
> there any similar functionality in ruby.h for translating to vectors and
> maps?  If so, what is the functionality?  If there is not a direct
> translation, what would be the best approach to do my task?  I'd like to
> avoid using another protocol, like SWIG, for this task, if possible.
>
> Thanks,
> Edward
> --
> Posted via http://www.ruby-forum.com/.
>
>
You'll want something like:

VALUE read_values(VALUE self, VALUE object) {
   if(rb_obj_is_instance_of(object, "Hash") {

  } else if (rb_obj_is_instance_of(object, "Array") {

  }
}

API is best found here: http://www.rubycentral.com/pickaxe/ext_ruby.html

Jason

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