first commit

nodes/vp_meta_subscriber.h

@@ -0,0 +1,22 @@
+#pragma once
+
+#include <memory>
+#include "../objects/vp_meta.h"
+
+namespace vp_nodes {
+    class vp_meta_subscriber {
+    private:
+        /* data */
+    public:
+        vp_meta_subscriber(/* args */);
+        ~vp_meta_subscriber();
+
+        // non-copyable for all child class
+        vp_meta_subscriber(const vp_meta_subscriber&) = delete;
+        vp_meta_subscriber& operator=(const vp_meta_subscriber&) = delete;
+
+        // receive meta from previous nodes
+        virtual void meta_flow(std::shared_ptr<vp_objects::vp_meta> meta) = 0;
+    };
+
+}