From 75a7f57ca11e5ef55c4ba1d301b313dff468d0c8 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E9=82=B9=E6=99=93=E8=88=AA?= <1210603696@qq.com>
Date: Mon, 16 Mar 2015 19:14:01 +0800
Subject: [PATCH]

---
 README.md                   | 18 ++++++++++++++++++
 TinySTL/Test/COWPtrTest.cpp | 19 +++++++++++++++++++
 TinySTL/main.cpp            |  6 ++++++
 3 files changed, 43 insertions(+)

diff --git a/README.md b/README.md
index 6dbb8e8..cb1cad6 100644
--- a/README.md
+++ b/README.md
@@ -47,6 +47,7 @@ TinySTL
 	* unordered_set：100%
 	* unique_ptr：100%
 	* shared_ptr：100%
+	* cow_ptr：100%
 * STL Algorithms:  
     * fill：100% 
     * fill_n：100% 
@@ -563,6 +564,23 @@ TinySTL
 
 	up.reset(new string("hello"));
 	assert(*up == "hello");
+
+
+
+####(19):cow_ptr
+
+    cow_ptr<string> cp1(new string("zouxiaohang"));
+	auto cp2 = cp1, cp3 = cp1;
+	assert(cp1 == cp2 && cp2 == cp3);
+	assert(*cp1 == *cp2 && *cp2 == *cp3 && *cp3 == "zouxiaohang");
+
+	*cp2;//read
+	assert(cp1 == cp2 && cp2 == cp3);
+	assert(*cp1 == *cp2 && *cp2 == *cp3 && *cp3 == "zouxiaohang");
+
+	cp2->append(" C++");//write
+	assert(*cp1 == *cp3 && *cp3 == "zouxiaohang");
+	assert(*cp2 == "zouxiaohang C++");
     
  
     
diff --git a/TinySTL/Test/COWPtrTest.cpp b/TinySTL/Test/COWPtrTest.cpp
index 139c1f4..08667aa 100644
--- a/TinySTL/Test/COWPtrTest.cpp
+++ b/TinySTL/Test/COWPtrTest.cpp
@@ -20,12 +20,31 @@ namespace TinySTL{
 
 			assert(cp1 == cp2 && !(cp2 != cp3));
 
+			*cp1 = "zouxiaohang";
+			assert(*cp1 == "zouxiaohang");
+			assert(*cp2 == "hello" && *cp3 == "hello");
+
 			cow_ptr<string> cp4;
 			assert(cp4 == nullptr);
 		}
+		void testCase2(){
+			cow_ptr<string> cp1(new string("zouxiaohang"));
+			auto cp2 = cp1, cp3 = cp1;
+			assert(cp1 == cp2 && cp2 == cp3);
+			assert(*cp1 == *cp2 && *cp2 == *cp3 && *cp3 == "zouxiaohang");
+
+			*cp2;//read
+			assert(cp1 == cp2 && cp2 == cp3);
+			assert(*cp1 == *cp2 && *cp2 == *cp3 && *cp3 == "zouxiaohang");
+
+			cp2->append(" C++");//write
+			assert(*cp1 == *cp3 && *cp3 == "zouxiaohang");
+			assert(*cp2 == "zouxiaohang C++");
+		}
 
 		void testAllCases(){
 			testCase1();
+			testCase2();
 		}
 	}
 }
\ No newline at end of file
diff --git a/TinySTL/main.cpp b/TinySTL/main.cpp
index 4c8bd60..ebb5f91 100644
--- a/TinySTL/main.cpp
+++ b/TinySTL/main.cpp
@@ -26,6 +26,8 @@
 #include "Test\VectorTest.h"
 
 using namespace TinySTL::Profiler;
+#include <string>
+#include <type_traits>
 
 int main(){
 	TinySTL::AlgorithmTest::testAllCases();
@@ -50,6 +52,10 @@ int main(){
 	TinySTL::Unordered_setTest::testAllCases();
 	TinySTL::VectorTest::testAllCases();
 
+	std::string s;
+	if (std::is_const<decltype(s.cbegin())>::value){
+		std::cout << "const" << std::endl;
+	}
 	system("pause");
 	return 0;
 }
\ No newline at end of file
-- 
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