adamhunter · February 26, 2013 19:00 · Feb 26, 2013
diff --git a/extconf.rb b/extconf.rb
@@ -0,0 +1,7 @@
+require 'mkmf'
+
+have_header('ruby.h') or missing('ruby.h')
+
+dir_config("ivar")
+
+create_makefile("ivar")
diff --git a/irb.sh b/irb.sh
@@ -0,0 +1 @@
+ruby extconf.rb && make && irb -I . -r ivar
diff --git a/ivar.c b/ivar.c
@@ -0,0 +1,19 @@
+#include "ruby.h"
+
+static VALUE rb_mIvar;
+
+static VALUE rb_ivar_iv_get(VALUE self, VALUE key) {
+  return rb_ivar_get(self, rb_to_id(key));
+}
+
+static VALUE rb_ivar_iv_set(VALUE self, VALUE key, VALUE value) {
+  return rb_ivar_set(self, rb_to_id(key), value);
+}
+
+void Init_ivar() {
+
+  rb_mIvar = rb_define_module("Ivar");
+  rb_define_method(rb_mIvar, "ivar_get", rb_ivar_iv_get, 1);
+  rb_define_method(rb_mIvar, "ivar_set", rb_ivar_iv_set, 2);
+
+}
diff --git a/usage.rb b/usage.rb
@@ -0,0 +1,12 @@
+$:.unshift('.')
+require 'ivar'
+
+Object.send(:include, Ivar)
+
+e = StandardError.new("foo")
+
+puts "Error message is: #{e.message}"
+
+e.ivar_set(:mesg, "bar")
+
+puts "Error message is: #{e.message}"
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