stellarUCI Chess engine written in C++20 |
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repetition.hpp (972B)
0 #ifndef STELLAR_REPETITION_H 1 #define STELLAR_REPETITION_H 2 3 #include <iostream> 4 #include <vector> 5 6 #include "utils.hpp" 7 8 namespace repetition { 9 10 class Table { 11 public: 12 Table() = default; 13 14 [[nodiscard]] bool is_repetition(const U64 hash) const { 15 for (int i = repetitions.size() - 1; i >= 0; i--) { 16 if (repetitions[i] == hash) return true; 17 if (repetitions[i] == hashNull) return false; 18 } 19 return false; 20 } 21 22 void pop() { repetitions.pop_back(); } 23 void clear() { repetitions.clear(); } 24 void push_null() { repetitions.push_back(hashNull); } 25 void push_hash(U64 hash) { repetitions.push_back(hash); } 26 27 friend std::ostream &operator<<(std::ostream &os, const Table &rtable) { 28 for (const U64 hash : rtable.repetitions) 29 os << hash << " "; 30 return os; 31 } 32 33 private: 34 std::vector<U64> repetitions; 35 36 const static int hashNull = 0; 37 }; 38 39 } // namespace repetition 40 41 #endif