module Example
  extend XNI::Extension
  extension 'example'

  # Attach xni_example_foo() as Example.foo
  native :foo, [], :fixnum
   
  class Foo < XNI::DataObject
    data :m_foo, :fixnum,
         :m_bar, :fixnum
    
    data_reader :m_bar
    data_accessor :m_foo

    # Attach a native function as Example::Foo#initialize
    native :initialize, [ :fixnum ], :void
    
    # Attach xni_example_foo_foo() as Example::Foo#foo
    native :foo, [], :fixnum
  end
end

XNI_EXPORT fixnum
xni_example_foo(RubyEnv* rb)
{
    return 0xfee1deadcafebabeLL;
}

XNI_EXPORT void 
xni_example_foo_initialize(RubyEnv* rb, struct Example_Foo* foo, fixnum foo_value)
{
    foo->m_bar = 0xbabef00dLL;
    foo->m_foo = foo_value;
}

XNI_EXPORT fixnum
xni_example_foo_foo(RubyEnv* rb, struct Example_Foo* foo)
{
    return foo->m_foo;
}

jruby-1.7.3.dev :002 > foo = Example::Foo.new(1234)
=> #<Example::Foo m_foo=1234 m_bar=3133075469> 
jruby-1.7.3.dev :003 > foo.foo
 => 1234     

:fixnum   - 64 bit signed integer
:double   - 64 bit floating point
:pointer  - void *    
:cstring  - const char *
:void     - void
:bool     - bool