diff --git a/TinySTL/Detail/Ref.h b/TinySTL/Detail/Ref.h
new file mode 100644
index 0000000..9f22598
--- /dev/null
+++ b/TinySTL/Detail/Ref.h
@@ -0,0 +1,42 @@
+#ifndef _REF_H_
+#define _REF_H_
+
+#include <atomic>
+
+namespace TinySTL{
+	namespace Detail{
+		template<class T>
+		struct ref_t{
+			std::atomic<size_t> ncount_;
+			T *data_;
+			
+			explicit ref_t(size_t n = 0, T *p = nullptr) :ncount_(n), data_(p){}
+			ref_t(const ref_t&) = default;
+			ref_t& operator = (const ref_t&) = default;
+
+			size_t count()const{ return ncount_.load(); }
+			T *get_data()const{ return data_; }
+
+			ref_t& operator ++(){ 
+				++ncount_; 
+				return *this; 
+			}
+			ref_t operator ++(int){
+				auto t = *this;
+				++*this;
+				return t;
+			}
+			ref_t& operator --(){
+				--ncount_;
+				return *this;
+			}
+			ref_t operator --(int){
+				auto t = *this;
+				--*this;
+				return t;
+			}
+		};
+	}
+}
+
+#endif
\ No newline at end of file
diff --git a/TinySTL/TinySTL.vcxproj b/TinySTL/TinySTL.vcxproj
index 5bebb18..8ed7924 100644
--- a/TinySTL/TinySTL.vcxproj
+++ b/TinySTL/TinySTL.vcxproj
@@ -121,6 +121,7 @@
     <ClInclude Include="Detail\Deque.impl.h" />
     <ClInclude Include="Detail\Graph.impl.h" />
     <ClInclude Include="Detail\List.impl.h" />
+    <ClInclude Include="Detail\Ref.h" />
     <ClInclude Include="Detail\Unordered_set.impl.h" />
     <ClInclude Include="Detail\Vector.impl.h" />
     <ClInclude Include="Functional.h" />
diff --git a/TinySTL/TinySTL.vcxproj.filters b/TinySTL/TinySTL.vcxproj.filters
index 88f8c9e..a452549 100644
--- a/TinySTL/TinySTL.vcxproj.filters
+++ b/TinySTL/TinySTL.vcxproj.filters
@@ -263,6 +263,9 @@
     <ClInclude Include="Test\UniquePtrTest.h">
       <Filter>Test</Filter>
     </ClInclude>
+    <ClInclude Include="Detail\Ref.h">
+      <Filter>Detail</Filter>
+    </ClInclude>
   </ItemGroup>
   <ItemGroup>
     <None Include="..\README.md" />