Provider type abstraction, partially completed.

include/wsrep/transaction_id.hpp

@@ -0,0 +1,46 @@
+//
+// Copyright (C) 2018 Codership Oy <info@codership.com>
+//
+
+#ifndef WSREP_TRANSACTION_ID_HPP
+#define WSREP_TRANSACTION_ID_HPP
+
+#include <ostream>
+
+namespace wsrep
+{
+    class transaction_id
+    {
+    public:
+        typedef unsigned long long type;
+
+
+        transaction_id()
+            : id_(-1)
+        { }
+
+        template <typename I>
+        transaction_id(I id)
+            : id_(static_cast<type>(id))
+        { }
+        type get() const { return id_; }
+        static unsigned long long invalid() { return type(-1); }
+        bool operator<(const transaction_id& other) const
+        {
+            return (id_ < other.id_);
+        }
+        bool operator==(const transaction_id& other) const
+        { return (id_ == other.id_); }
+        bool operator!=(const transaction_id& other) const
+        { return (id_ != other.id_); }
+    private:
+        type id_;
+    };
+
+    static inline std::ostream& operator<<(std::ostream& os, transaction_id id)
+    {
+        return (os << id.get());
+    }
+}
+
+#endif // WSREP_TRANSACTION_ID_HPP