+#include <map>
+#include <string>
+
+#include "types.h"
+
+namespace Stockfish {
+
+class Position;
+
+namespace UCI {
+
+class Option;
+
+/// Custom comparator because UCI options should be case insensitive
+struct CaseInsensitiveLess {
+ bool operator() (const std::string&, const std::string&) const;
+};
+
+/// Our options container is actually a std::map
+typedef std::map<std::string, Option, CaseInsensitiveLess> OptionsMap;
+
+/// Option class implements an option as defined by UCI protocol
+class Option {
+
+ typedef void (*OnChange)(const Option&);
+
+public:
+ Option(OnChange = nullptr);
+ Option(bool v, OnChange = nullptr);
+ Option(const char* v, OnChange = nullptr);
+ Option(double v, int minv, int maxv, OnChange = nullptr);
+ Option(const char* v, const char* cur, OnChange = nullptr);
+
+ Option& operator=(const std::string&);
+ void operator<<(const Option&);
+ operator double() const;
+ operator std::string() const;
+ bool operator==(const char*) const;
+
+private:
+ friend std::ostream& operator<<(std::ostream&, const OptionsMap&);
+
+ std::string defaultValue, currentValue, type;
+ int min, max;
+ size_t idx;
+ OnChange on_change;
+};
+
+void init(OptionsMap&);
+void loop(int argc, char* argv[]);
+std::string value(Value v);
+std::string square(Square s);
+std::string move(Move m, bool chess960);
+std::string pv(const Position& pos, Depth depth, Value alpha, Value beta);
+std::string wdl(Value v, int ply);
+Move to_move(const Position& pos, std::string& str);
+
+} // namespace UCI