diff --git a/TinySTL/Algorithm.h b/TinySTL/Algorithm.h
index eb3c327..08104b4 100644
--- a/TinySTL/Algorithm.h
+++ b/TinySTL/Algorithm.h
@@ -177,6 +177,16 @@ namespace TinySTL{
 		}
 		return true;
 	}
+	//********** [all_of] *************************
+	//********* [Algorithm Complexity: O(N)] ****************
+	template <class InputIterator, class UnaryPredicate>
+	bool all_of(InputIterator first, InputIterator last, UnaryPredicate pred){
+		for (; first != last; ++first){
+			if (!pred(*first))
+				return false;
+		}
+		return true;
+	}
 }