ryanb (owner)

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gist: 11611 Download_button fork
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Public Clone URL: git://gist.github.com/11611.git
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hello.c #
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/*
  PROBLEM:
  >> h = Hello.new('hi!')
  => #<Hello:0x4b730>
  >> h.greet
  hi!=> nil
  >> h.greet
  hi!=> nil
  ..
  >> h.greet
  hi!=> nil
  >> h.greet
  => nil
  >> h.greet
  => nil
*/
 
#include <ruby.h>
 
VALUE cHello;
 
#define HELLO(obj)	(Check_Type(obj, T_DATA), (struct Hello*)DATA_PTR(obj))
 
struct Hello {
  char *greeting;
};
 
static void hello_free(struct Hello *hello)
{
  free(hello->greeting);
}
 
static void hello_mark(struct Hello *hello)
{
}
 
static VALUE hello_new(VALUE klass)
{
  struct Hello *hello;
  return Data_Make_Struct(klass, struct Hello, hello_mark, hello_free, hello);
}
 
static VALUE hello_init(VALUE obj, VALUE greeting)
{
  HELLO(obj)->greeting = RSTRING(greeting)->ptr;
  return Qnil;
}
 
static VALUE hello_greet(VALUE obj)
{
  printf(HELLO(obj)->greeting);
  return Qnil;
}
 
void Init_hello()
{
  cHello = rb_define_class("Hello", rb_cObject);
  rb_define_alloc_func(cHello, hello_new);
  rb_define_method(cHello, "initialize", hello_init, 1);
  rb_define_method(cHello, "greet", hello_greet, 0);
}