C extensions using Singleton

[Brian Palmer]

Another C extension question for the experts: in a C ruby class, I'm
trying to use the Singleton standard library. It doesn't work, though
no errors are thrown.

ruby_rpg_class = rb_define_class("RPGEngine", rb_cObject);
rb_require("singleton");
rb_include_module(ruby_rpg_class, rb_const_get(rb_cObject,
rb_intern("Singleton")));

With this C code above, I can still call RPGEngine.new and get a new
instance of the class. RPGEngine.instance throws a NoMethodError.

Is the code above correct?

Thanks again,
-- Brian

 

[ts]

B> ruby_rpg_class = rb_define_class("RPGEngine", rb_cObject);
B> rb_require("singleton");
B> rb_include_module(ruby_rpg_class, rb_const_get(rb_cObject,
B> rb_intern("Singleton")));

Add this

rb_funcall(rb_const_get(rb_cObject, rb_intern("Singleton")),
rb_intern("included"), 1, ruby_rpg_class);


Guy Decoux

 

[Brian Palmer]

So just for clarity's sake: using rb_include_module skips the
"included" callback that usually happens when a module is included?

-- Brian

 

[ts]

B> So just for clarity's sake: using rb_include_module skips the
B> "included" callback that usually happens when a module is included?

No, not really

Module#include call #append_features and #included

rb_include_module() is the default function for Module#append_features


Guy Decoux

 

[Brian Palmer]

Got it. Thanks.

-- Brian

B> So just for clarity's sake: using rb_include_module skips the
B> "included" callback that usually happens when a module is included?

No, not really

Module#include call #append_features and #included

rb_include_module() is the default function for Module#append_features


Guy Decoux