Provider type abstraction, partially completed.

include/wsrep/buffer.hpp

@@ -0,0 +1,31 @@
+//
+// Copyright (C) 2018 Codership Oy <info@codership.com>
+//
+
+#ifndef WSREP_BUFFER_HPP
+#define WSREP_BUFFER_HPP
+
+namespace wsrep
+{
+    class buffer
+    {
+    public:
+        buffer()
+            : ptr_()
+            , size_()
+        { }
+        buffer(const void* ptr, size_t size)
+            : ptr_(ptr)
+            , size_(size)
+        { }
+
+        const void* ptr() const { return ptr_; }
+        size_t size() const { return size_; }
+
+    private:
+        const void* ptr_;
+        size_t size_;
+    };
+}
+
+#endif // WSREP_BUFFER_HPP