/*
 *  call-seq:
 *     term_enum.each {|term, doc_freq| do_something() } -> term_count
 *
 *  Iterates through all the terms in the field, yielding the term and the
 *  document frequency. 
 */
static VALUE
frt_te_each(VALUE self)
{
    TermEnum *te = (TermEnum *)DATA_PTR(self);
    char *term;
    int term_cnt = 0;
    VALUE vals = rb_ary_new2(2);
    RARRAY(vals)->len = 2;
    rb_mem_clear(RARRAY(vals)->ptr, 2);


    /* each is being called so there will be no current term */
    rb_ivar_set(self, id_term, Qnil);

    
    while (NULL != (term = te->next(te))) {
        term_cnt++;
        RARRAY(vals)->ptr[0] = rb_str_new(term, te->curr_term_len);
        RARRAY(vals)->ptr[1] = INT2FIX(te->curr_ti.doc_freq);
        rb_yield(vals);
    }
    return INT2FIX(term_cnt);
}