From: Edward Liu <liu_edward@...>
Date: 2008-01-12T04:12:59+09:00
Subject: Using ruby.h to generate C++ vectors and maps

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
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