+namespace {
+
+ // some helper functions for opt::print()
+
+ std::string* descr_str;
+ std::string* val_or_string_str;
+
+ void print_helper_init()
+ {
+ descr_str = new std::string;
+ val_or_string_str = new std::string;
+ }
+
+ void print_helper_destroy()
+ {
+ delete val_or_string_str;
+ delete descr_str;
+ }
+
+ const char* descr(const char* str)
+ {
+ const int descr_width = 35;
+ std::string* res = descr_str;
+ *res = str;
+ res->resize(descr_width, '.');
+ return res->c_str();
+ }
+
+ const char* on_off(bool b)
+ {
+ return b ? "on" : "off";
+ }
+
+ template <typename T>
+ const char* val_or_string(const T& val, const char* str, const T& deflt = 0)
+ {
+ std::string* res = val_or_string_str;
+ if (val != deflt) {
+ std::ostringstream oss;
+ oss << val;
+ *res = oss.str();
+ } else {
+ *res = str;
+ }
+ return res->c_str();
+ }
+
+ // helper function for opt::parse_args()
+
+ template <typename T>
+ bool nol_find_prefix(const T& nol, const char* descr, std::string& name)
+ {
+ bool result = nol.exists(name);
+ if (!result) {
+ std::stack<std::string> candidates;
+ for (typename T::iterator it = nol.begin() ; it != nol.end() ; ++it) {
+ const std::string& fullname = nol.get_name(it);
+ if (fullname.compare(0, name.length(), name) == 0)
+ candidates.push(fullname);
+ }
+ switch (candidates.size()) {
+ case 0:
+ ERROR2("unknownw %s -- %s", descr, name.c_str());
+ break;
+ case 1:
+ name = candidates.top();
+ candidates.pop();
+ result = true;
+ DEBUG2("infered %s -- %s", descr, name.c_str());
+ break;
+ default:
+ ERROR2("ambiguous %s -- %s", descr, name.c_str());
+ while (!candidates.empty()) {
+ ERROR1(" candidates are -- %s", candidates.top().c_str());
+ candidates.pop();
+ }
+ break;
+ }
+ }
+ return result;
+ }
+
+} // namespace
+
