// file: dec_prune_2.cc//// isip include files//#include "decoder.h"#include "decoder_constants.h"// method: set_beam_cc//// arguments://  int_4 level: (input) the level at which the beam works//// return: a logical_1 to indicate status//// this method sets the pruning beam threshold score at the specified// level//logical_1 Decoder::set_beam_cc(int_4 level_a) {  // find the beam pruning score for pruning at the specified level  //  if (beam_d[level_a] != (float_4)0) {    beam_thresh_d[level_a] = max_score_d[level_a] + beam_d[level_a];    max_score_d[level_a] = DEC_DEFAULT_SCORE;  }    // exit gracefully  //  return ISIP_TRUE;}