From: Nobuyoshi Nakada <nobu@...>
Date: 2008-08-19T03:26:07+09:00
Subject: Re: easiest way to access rb_sprintf

Hi,

At Mon, 18 Aug 2008 22:31:41 +0900,
Alex Fenton wrote in [ruby-talk:311670]:
> I want to create a ruby method in a C++ extension that will spit out the 
>   C++ pointer address of the wrapped object - useful for debugging. I 
> have got the following, which works, but I was wondering if there was an 
> easier way to access this that I'm missing?

rb_sprintf is a function added in 1.9, and you can use it like
printf.

> static VALUE
> cpp_ptr_addr(VALUE self, VALUE obj)
> {
     void *ptr = DATA_PTR(obj);
     return rb_sprintf("%p", ptr);
> }

-- 
Nobu Nakada