diff --git a/TinySTL/COWPtr.h b/TinySTL/COWPtr.h
index e94fbbcc50e2ae236d540634bf0b0fb6848dbb5a..894564678b38b3d9037ebd9ac1bd4790ad991161 100644
--- a/TinySTL/COWPtr.h
+++ b/TinySTL/COWPtr.h
@@ -6,9 +6,24 @@
 namespace TinySTL{
 	template<class T>
 	class cow_ptr{
+	public:
+		typedef T element_type;
+	public:
+		explicit cow_ptr(T *p = nullptr);
+		template<class D>
+		cow_ptr(T *p, D d);
+
+		cow_ptr(const cow_ptr& cp);
+		cow_ptr& operator = (const cow_ptr& cp);
+
+		element_type operator *()const;
+		element_type *operator ->()const;
 	private:
-		shared_ptr<T> ptr_;
+		shared_ptr<element_type> ptr_;
+	
 	};
 }
 
+#include "Detail\COWPtr.impl.h"
+
 #endif
\ No newline at end of file