From: ts <decoux@...>
Date: 2006-04-15T18:42:26+09:00
Subject: Re: Calling instance_eval on a block in C

>>>>> "J" == John Lam <drjflam@gmail.com> writes:

J> def eval_it(obj, &b)
J>   obj.instance_eval(&b)
J> end

moulon% cat a.c
#include <ruby.h>

static VALUE
a_eval_it(VALUE obj, VALUE a)
{
    return rb_obj_instance_eval(0, 0, a);
}

void Init_a()
{
    VALUE a_cA = rb_define_class("A", rb_cObject);
    rb_define_method(a_cA, "eval_it", a_eval_it, 1);
}
moulon% 

moulon% ruby -ra -e 'b = Object.new; A.new.eval_it(b) {p self; @b = 12}; p b'
#<Object:0xb7d5ec8c>
#<Object:0xb7d5ec8c @b=12>
moulon% 


Guy Decoux