Return value of rb_define_class (et al.) can't be stored and reused
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Key: JRUBY-6085
URL: https://jira.codehaus.org/browse/JRUBY-6085
Project: JRuby
Issue Type: Bug
Components: C Extensions
Affects Versions: JRuby 1.6
Reporter: Mon ouïe
Assignee: Thomas E Enebo
Priority: Minor
In MRI and Rubinius, one can store the return value of rb_define_class (and
similar functions) in a global variable and use it for type checks later.
#include "ruby.h"
#include <stdio.h>
VALUE cFoo;
VALUE is_foo(VALUE self, VALUE obj) {
if (RTEST(rb_obj_is_kind_of(obj, cFoo))
printf("it's a foo!\n");
}
void Init_foo() {
cFoo = rb_define_class("Foo");
rb_define_singleton_method(cFoo, is_foo, "is_foo?", 1);
}
In JRuby, though, the VALUE will get invalidated after sometimes (causing some
error messages I don't have right now). Users of the C API have to retrieve the
constant manually every time to ensure it will work.
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