gistfile1.cpp

void try_call_argv(const char* fn, int argc, ...) {
  mrb_value argv[argc];
  va_list ap;
  va_start(ap, argc);
  for (i = 0; i < argc; i++) {
    argv[i] = va_arg(ap, mrb_value);
  }
  va_end(ap);

  if (fnlookup.count(fn)) {
    mrb_funcall(mrb, fnlookup.at(fn), "call", argc, argv);
  }
}