test08.cpp

chronolaw · chronolaw · commit 07a3dd3125d2 · 2020-02-26T13:15:07.000+08:00
diff --git a/section2/test07.cpp b/section2/test07.cpp
@@ -51,7 +51,7 @@ class DemoClass final
 private:
     using mutex_type = int; // dummy type
 private:
-    mutex_type  m_mutex;
+    mutable mutex_type  m_mutex;
 
     const long  MAX_SIZE = 256;
     int         m_value;
@@ -60,6 +60,11 @@ class DemoClass final
     {
         return m_value;
     }
+
+    void save_data() const
+    {
+        m_mutex++;
+    }
 };
 
 
diff --git a/section2/test08.cpp b/section2/test08.cpp
@@ -0,0 +1,80 @@
+// Copyright (c) 2020 by Chrono
+//
+// g++ test08.cpp -std=c++11 -o a.out;./a.out
+// g++ test08.cpp -std=c++14 -o a.out;./a.out
+// g++ test08.cpp -std=c++14 -I../common -o a.out;./a.out
+
+#include <cassert>
+
+#include <iostream>
+#include <memory>
+#include <string>
+
+template<class T, class... Args>
+std::unique_ptr<T>
+my_make_unique(Args&&... args)
+{
+    return std::unique_ptr<T>(
+            new T(std::forward<Args>(args)...));
+}
+
+void case1()
+{
+    using namespace std;
+
+    unique_ptr<int> ptr1(new int(10));
+    assert(*ptr1 = 10);
+    assert(ptr1 != nullptr);
+
+    unique_ptr<string> ptr2(new string("hello"));
+    assert(*ptr2 == "hello");
+    assert(ptr2->size() == 5);
+
+    //ptr1++;
+    //ptr2 += 2;
+
+    //unique_ptr<int> ptr3;
+    //*ptr3 = 42;
+
+    auto ptr3 = make_unique<int>(42);
+    assert(ptr3 && *ptr3 == 42);
+
+    auto ptr4 = make_unique<string>("god of war");
+    assert(!ptr4->empty());
+
+    auto ptr5 = my_make_unique<long>(100L);
+    assert(*ptr5 == 100);
+}
+
+void case2()
+{
+    using namespace std;
+
+    auto ptr1 = make_unique<int>(42);
+    assert(ptr1 && *ptr1 == 42);
+
+    auto ptr2 = std::move(ptr1);
+    assert(!ptr1 && ptr2);
+}
+
+void case3()
+{
+    using namespace std;
+
+    auto ptr1 = make_shared<int>(42);
+    assert(ptr1 && *ptr1 == 42);
+
+    auto ptr2 = make_shared<string>("god of war");
+    assert(!ptr2->empty());
+}
+
+int main()
+{
+    using namespace std;
+
+    case1();
+    case2();
+    case3();
+
+    cout << "smart_ptr demo" << endl;
+}
