unbind

/*
 *  call-seq:
 *     meth.unbind    => unbound_method
 *  
 *  Dissociates <i>meth</i> from it's current receiver. The resulting
 *  <code>UnboundMethod</code> can subsequently be bound to a new object
 *  of the same class (see <code>UnboundMethod</code>).
 */

static VALUE
method_unbind(obj)
    VALUE obj;
{
    VALUE method;
    struct METHOD *orig, *data;

    Data_Get_Struct(obj, struct METHOD, orig);
    method = Data_Make_Struct(rb_cUnboundMethod, struct METHOD, bm_mark, free, data);
    data->klass = orig->klass;
    data->recv = Qundef;
    data->id = orig->id;
    data->body = orig->body;
    data->rklass = orig->rklass;
    data->oid = orig->oid;
    OBJ_INFECT(method, obj);

    return method;
}