/*
 *  call-seq:
 *     index_reader.num_docs -> number
 *
 *  Returns the number of accessible (not deleted) documents in the index.
 *  This will be equal to IndexReader#max_doc if there have been no documents
 *  deleted from the index.
 */
static VALUE
frt_ir_num_docs(VALUE self)
{
    IndexReader *ir = (IndexReader *)DATA_PTR(self);
    return INT2FIX(ir->num_docs(ir));
}