diff --git a/include/zll/meta/traits/remove_reference.hpp b/include/zll/meta/traits/remove_reference.hpp
new file mode 100644
index 0000000..11c547a
--- /dev/null
+++ b/include/zll/meta/traits/remove_reference.hpp
@@ -0,0 +1,19 @@
+#ifndef ZLL_META_TRAITS_REMOVEREFERENCE_HPP
+#define ZLL_META_TRAITS_REMOVEREFERENCE_HPP
+
+#include "zll/meta/traits/remove_cv.hpp"
+
+namespace zll {
+namespace meta {
+// clang-format off
+template <typename T> struct remove_reference     { typedef T type; };
+template <typename T> struct remove_reference<T&> { typedef T type; };
+// clang-format on
+template <typename T>
+struct remove_cvref {
+    typedef typename zll::meta::remove_cv<typename zll::meta::remove_reference<T>::type>::type type;
+};
+}  // namespace meta
+}  // namespace zll
+
+#endif  // ZLL_META_TRAITS_REMOVEREFERENCE_HPP
diff --git a/include/zll/meta/type_traits.hpp b/include/zll/meta/type_traits.hpp
index 95fe45d..2bdd8e2 100644
--- a/include/zll/meta/type_traits.hpp
+++ b/include/zll/meta/type_traits.hpp
@@ -15,15 +15,18 @@
 #include "zll/meta/traits/is_const.hpp"
 #include "zll/meta/traits/is_enum.hpp"
 #include "zll/meta/traits/is_floating_point.hpp"
+#include "zll/meta/traits/is_function.hpp"
 #include "zll/meta/traits/is_integral.hpp"
 #include "zll/meta/traits/is_member_pointer.hpp"
 #include "zll/meta/traits/is_object.hpp"
 #include "zll/meta/traits/is_pointer.hpp"
+#include "zll/meta/traits/is_reference.hpp"
 #include "zll/meta/traits/is_same.hpp"
 #include "zll/meta/traits/is_scalar.hpp"
 #include "zll/meta/traits/is_union.hpp"
 
 #include "zll/meta/traits/remove_cv.hpp"
+#include "zll/meta/traits/remove_reference.hpp"
 
 
 #endif // ZLL_TYPETRAITS_HPP