整理代码

video/core/System.cpp

@@ -0,0 +1,37 @@
+/*
+ *******************************************************************************
+ *                                   INCLUDE
+ *******************************************************************************
+ */
+#include "System.h"
+#include <Poco/Exception.h>
+
+namespace Video
+{
+namespace Core
+{
+/*
+ *******************************************************************************
+ *                                CLASS DEFINE
+ *******************************************************************************
+ */
+System* System::_pInstance = nullptr;
+System::System()
+{
+}
+
+System::~System()
+{
+    delete _pInstance;
+    _pInstance = nullptr;
+}
+
+uint64_t System::timestamp()
+{
+    if (!_pInstance)
+        throw Poco::IllegalStateException("Unregister implement class.");
+
+    return _pInstance->getTimestamp();
+}
+}
+}