make_cow

README.md

@@ -569,7 +569,7 @@ TinySTL
 
 ####(19):cow_ptr
 
-    cow_ptr<string> cp1(new string("zouxiaohang"));
+    cow_ptr<string> cp1 = make_cow<string>("zouxiaohang");
 	auto cp2 = cp1, cp3 = cp1;
 	assert(cp1 == cp2 && cp2 == cp3);
 	assert(*cp1 == *cp2 && *cp2 == *cp3 && *cp3 == "zouxiaohang");

TinySTL/COWPtr.h

@@ -68,6 +68,11 @@ namespace TinySTL{
 		template<class _T>
 		friend class Detail::proxy;
 	};
+
+	template<class T, class... Args>
+	cow_ptr<T> make_cow(Args...args){
+		return cow_ptr<T>(new T(std::forward<Args>(args)...));
+	}
 }
 
 #include "Detail\COWPtr.impl.h"

TinySTL/Test/COWPtrTest.cpp

@@ -28,7 +28,7 @@ namespace TinySTL{
 			assert(cp4 == nullptr);
 		}
 		void testCase2(){
-			cow_ptr<string> cp1(new string("zouxiaohang"));
+			cow_ptr<string> cp1 = make_cow<string>("zouxiaohang");
 			auto cp2 = cp1, cp3 = cp1;
 			assert(cp1 == cp2 && cp2 == cp3);
 			assert(*cp1 == *cp2 && *cp2 == *cp3 && *cp3 == "zouxiaohang");