first commit

objects/vp_control_meta.cpp

@@ -0,0 +1,31 @@
+
+#include "vp_control_meta.h"
+
+namespace vp_objects {
+        
+    vp_control_meta::vp_control_meta(vp_control_type control_type, int channel_index, std::string control_uid): 
+        vp_meta(vp_meta_type::CONTROL, channel_index), control_type(control_type), control_uid(control_uid) {
+            if (control_uid.empty()){
+                generate_uid();
+            }
+    }
+    
+    vp_control_meta::~vp_control_meta() {
+
+    }
+
+    std::shared_ptr<vp_meta> vp_control_meta::clone() {
+        // just call copy constructor and return new pointer
+        return std::make_shared<vp_control_meta>(*this);
+    }
+
+    void vp_control_meta::generate_uid() {
+        auto now = std::chrono::system_clock::now();
+        auto period = now.time_since_epoch();
+
+        // milliseconds since 1970-1-1 00:00:00
+        auto timestamp = std::chrono::duration_cast<std::chrono::milliseconds>(period).count();
+
+        control_uid = "vp_control_" + std::to_string(timestamp);
+    }
+}