/*
 *  call-seq:
 *     index_reader.deleted?(doc_id) -> bool
 *
 *  Returns true if the document at +doc_id+ has been deleted.
 */
static VALUE
frt_ir_is_deleted(VALUE self, VALUE rdoc_id)
{
    IndexReader *ir = (IndexReader *)DATA_PTR(self);
    return ir->is_deleted(ir, FIX2INT(rdoc_id)) ? Qtrue : Qfalse;
}