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+/*
+ * Copyright (C) 2018 Codership Oy <info@codership.com>
+ *
+ * This file is part of wsrep-lib.
+ *
+ * Wsrep-lib is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * Wsrep-lib is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with wsrep-lib. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef WSREP_SEQNO_HPP
+#define WSREP_SEQNO_HPP
+
+#include <iosfwd>
+
+namespace wsrep
+{
+ /** @class seqno
+ *
+ * Sequence number type.
+ */
+ class seqno
+ {
+ public:
+ typedef long long native_type;
+
+ seqno()
+ : seqno_(-1)
+ { }
+
+ explicit seqno(long long seqno)
+ : seqno_(seqno)
+ { }
+
+ long long get() const
+ {
+ return seqno_;
+ }
+
+ bool is_undefined() const
+ {
+ return (seqno_ == -1);
+ }
+
+ bool operator<(seqno other) const
+ {
+ return (seqno_ < other.seqno_);
+ }
+
+ bool operator>(seqno other) const
+ {
+ return (seqno_ > other.seqno_);
+ }
+ bool operator==(seqno other) const
+ {
+ return (seqno_ == other.seqno_);
+ }
+ bool operator!=(seqno other) const
+ {
+ return !(seqno_ == other.seqno_);
+ }
+ seqno operator+(seqno other) const
+ {
+ return (seqno(seqno_ + other.seqno_));
+ }
+ seqno operator+(long long other) const
+ {
+ return (*this + seqno(other));
+ }
+ static seqno undefined() { return seqno(-1); }
+
+ private:
+ native_type seqno_;
+ };
+
+ std::ostream& operator<<(std::ostream& os, wsrep::seqno seqno);
+}
+
+#endif // WSREP_SEQNO_HPP