parse_options.h

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  // parse options
  unsigned int dbgMode= 0;
  string ftype= "FLOAT";
  unsigned int fixsynapse= 0; 
  unsigned int cpu_only= 0;
  string option;
  for (int i= argStart; i < argc; i++) {
      if (extract_option(argv[i],option) != 0) {
          cerr << "Unknown option '" << argv[i] << "'." << endl;
          exit(1);
      }
      else {
          if (option == "DEBUG") {
              if (extract_bool_value(argv[i],dbgMode) != 0) {
                  cerr << "illegal value for 'DEBUG' option." << endl;
                  exit(1);
              }
          }
          else if (option == "FTYPE") {
              extract_string_value(argv[i],ftype);
              if ((ftype != "FLOAT") && (ftype != "DOUBLE")) {
                  cerr << "illegal value " << ftype << " of 'FTYPE' option." <<endl;
                  exit(1);
              }
          }
          else if (option == "REUSE") {
              if (extract_bool_value(argv[i], fixsynapse) != 0) {
                  cerr << "illegal value for 'REUSE' option." << endl;
                  exit(1);
              }
          }
          else if (option == "CPU_ONLY") {
              if (extract_bool_value(argv[i], cpu_only) != 0) {
                  cerr << "illegal value for 'CPU_ONLY' option." << endl;
                  exit(1);
              }
          }
      }
  }
  if (cpu_only && (which == 1)) {
      cerr << "You cannot use a GPU in CPU_only mode." << endl;
      exit(1);
  }