/*
 *  call-seq:
 *     term_doc_enum.each {|doc_id, freq| do_something() } -> doc_count
 *
 *  Iterate through the documents and document frequencies in the
 *  +term_doc_enum+.
 *
 *  NOTE: this method can only be called once after each seek. If you need to
 *  call +#each+ again then you should call +#seek+ again too.
 */
static VALUE
frt_tde_each(VALUE self)
{
    int doc_cnt = 0;
    TermDocEnum *tde = (TermDocEnum *)DATA_PTR(self);
    VALUE vals = rb_ary_new2(2);
    RARRAY(vals)->len = 2;
    rb_mem_clear(RARRAY(vals)->ptr, 2);

    while (tde->next(tde)) {
        doc_cnt++;
        RARRAY(vals)->ptr[0] = INT2FIX(tde->doc_num(tde));
        RARRAY(vals)->ptr[1] = INT2FIX(tde->freq(tde));
        rb_yield(vals);

    }
    return INT2FIX(doc_cnt);
}