Apache pulsar C++ client Transaction support header file

lib/include/pulsar/Transaction.h

@@ -0,0 +1,33 @@
+#pragma once
+
+#include <cstdint>
+#include <iostream>
+
+namespace pulsar {
+
+class TxnID {
+    int64_t msb_;
+    int64_t lsb_;
+
+public:
+    TxnID() : msb_(0), lsb_(0) {}
+    TxnID(int64_t msb, int64_t lsb) : msb_(msb), lsb_(lsb) {}
+
+    // Getters (Java-style, for compatibility with your test code)
+    int64_t mostSigBits() const { return msb_; }
+    int64_t leastSigBits() const { return lsb_; }
+
+    // Equality check
+    bool operator==(const TxnID& other) const {
+        return msb_ == other.msb_ && lsb_ == other.lsb_;
+    }
+
+    // For debugging
+    friend std::ostream& operator<<(std::ostream& os, const TxnID& txnId) {
+        os << txnId.msb_ << ":" << txnId.lsb_;
+        return os;
+    }
+};
+
+} // namespace pulsar
+