From: Joel VanderWerf <vjoel@...>
Date: 2002-09-13T13:41:57+09:00
Subject: Re: a question about using inline.rb


Maggie Xiao wrote:
 > Hi there,
 >
 > Is there anyone has used inline.rb to extend ruby in c? Should i 
include the
 > header file
 > inside the class? and should i include them just like in c code? For 
example:
 > #include <unistd.h>
 > #include <signal.h>
 >
 > Thanks,
 >
 > Maggie
 >

I don't know how inline.rb handles this, but cgenerator defines an 
include method that you can call in the context of your function 
definition (this is from examples/sample.rb):

lib.define("distance").instance_eval {
   arguments "point *p1", "point *p2"
   return_type "double"
   scope :extern
   returns "sqrt(pow(p1->x - p2->x, 2) + pow(p1->y - p2->y, 2))"
   include "<math.h>"
}

(This is just a C function, not a method, but cgenerator lets you define 
methods, too.)

The include call propagates up to the library object, which generates 
the appropriate code in its main header file, and checks if you have 
already included <math.h>.