From: Edward Liu <liu_edward@...>
Date: 2008-01-15T00:59:05+09:00
Subject: Re: Using ruby.h to generate C++ vectors and maps

I'm looking through the documentation for ruby.h and intern.h, and I am 
having a problem with trying to be able to access a Ruby hash inside a 
C/C++ program.  I see that using ruby.h, I have access to rb_hash_new 
and a couple other hash functions.  However, it doesn't seem that I can 
use a function that will return me an array of keys to access the hash. 
For example, hash.c in Ruby has a rb_hash_keys functions.  However, it 
is not accessible through either ruby.h or intern.h.  Does anyone know 
of any way I can full access to the Ruby hash and array functions for 
C/C++?

Thanks!
Edward

Jason Roelofs wrote:
> On Jan 11, 2008 2:51 PM, Edward Liu <liu_edward@emc.com> wrote:
> 
>> >
>> >>    if(rb_obj_is_instance_of(object, "Hash") {
>>
>> --
>> Posted via http://www.ruby-forum.com/.
>>
>>
> Then no, there isn't. If you know that your array / hash is full of a 
> single
> type, then the following will work fine:
> 
> std::vector<your_type> vec;
> 
> for(int i = 0; i < RARRAY(object)->len; i++) {
>   vec << NUM2INT(rb_array_get(i)); // or STR2CSTR, whatever conversion 
> is
> needed
> }
> 
> But if it's a generic array and you can't guarentee types, you'll have 
> to
> make some concessions (like turning the values into strings).
> 
> Look through the API, there are methods and macros that will help you.
> 
> Jason

-- 
Posted via http://www.ruby-forum.com/.