done

HW8/main.cpp

@@ -0,0 +1,121 @@
+#include "shared_ptr.hpp"
+
+#include <iostream>
+#include <memory>
+#include <string>
+
+class MyClass
+{
+public:
+  MyClass() = default;
+  MyClass(std::string name) :
+      m_name(name)
+  {
+  }
+  MyClass(std::string name, unsigned int rank) :
+      m_name(name),
+      m_rank(rank)
+  {
+  }
+  MyClass(unsigned int rank, int) :
+  // Not giving the second parameter a name to prevent a compiler warning
+      m_rank(rank)
+  {
+  }
+
+  void showMessage(std::string msg)
+  {
+    std::cout << msg << std::endl;
+  }
+
+  std::string m_name = "anonymous";
+  unsigned int m_rank = 0;
+};
+
+void demoSharedPointer();
+
+// ------------------------------------------------------------------
+//
+// Shared memory assignment: usu::shared_ptr usu::unique_ptr
+//
+// ------------------------------------------------------------------
+int main()
+{
+  demoSharedPointer();
+
+  return 0;
+}
+
+void demoSharedPointer()
+{
+  std::shared_ptr<int> p1 = std::make_shared<int>();
+  usu::shared_ptr<int> p2 = usu::make_shared<int>();
+  usu::shared_ptr<std::string> p2a = usu::make_shared<std::string>();
+
+  std::shared_ptr<int> p3 = std::make_shared<int>(10);
+  usu::shared_ptr<int> p4 = usu::make_shared<int>(10);
+
+  std::shared_ptr<std::string> p5 = std::make_shared<std::string>();
+  usu::shared_ptr<std::string> p6 = usu::make_shared<std::string>();
+  usu::shared_ptr<std::string> p6b = usu::make_shared<std::string>("Hi Mom!");
+
+  std::shared_ptr<MyClass> p7 = std::make_shared<MyClass>();
+  usu::shared_ptr<MyClass> p8 = usu::make_shared<MyClass>();
+
+  std::shared_ptr<MyClass> p9 = std::make_shared<MyClass>("Test");
+  usu::shared_ptr<MyClass> p10 = usu::make_shared<MyClass>("Test");
+
+  std::shared_ptr<MyClass> p11 = std::make_shared<MyClass>("Test", 2);
+  usu::shared_ptr<MyClass> p12 = usu::make_shared<MyClass>("Test", 2);
+
+  std::shared_ptr<MyClass> p13 = std::make_shared<MyClass>(1, 2);
+  usu::shared_ptr<MyClass> p14 = usu::make_shared<MyClass>(1, 2);
+
+  std::cout << std::endl;
+  std::cout << "--- Reference Counts ---" << std::endl;
+
+  std::cout << "p13 : " << p13.use_count() << std::endl;
+  std::cout << "P14 : " << p14.use_count() << std::endl;
+
+  auto p13b = p13;
+  auto p14b = p14;
+
+  std::cout << "auto p13b = p13" << std::endl;
+  std::cout << "auto p14b = p14" << std::endl;
+
+  std::cout << "p13 : " << p13.use_count() << std::endl;
+  std::cout << "P14 : " << p14.use_count() << std::endl;
+
+  p13b = p11;
+  p14b = p12;
+
+  std::cout << "auto p13b = p11" << std::endl;
+  std::cout << "auto p14b = p12" << std::endl;
+
+  std::cout << "p11 : " << p11.use_count() << std::endl;
+  std::cout << "P12 : " << p12.use_count() << std::endl;
+  std::cout << "p13b : " << p13b.use_count() << std::endl;
+  std::cout << "P14b : " << p14b.use_count() << std::endl;
+
+  std::cout << "p13 : " << p13.use_count() << std::endl;
+  std::cout << "P14 : " << p14.use_count() << std::endl;
+
+  std::cout << std::endl;
+  std::cout << "--- Member Access ---" << std::endl;
+
+  p13->showMessage("from p13");
+  p14->showMessage("from p14");
+
+  (*p13).showMessage("from (*p13)");
+  (*p14).showMessage("from (*p14)");
+  MyClass* x = p13.get();
+  x->showMessage("from p13.get()");
+  MyClass* y = p14.get();
+  y->showMessage("from p14.get()");
+
+  usu::shared_ptr<MyClass[]> a1 = usu::make_shared_array<MyClass, 4>();
+  for (unsigned int i = 0; i < a1.size(); i++)
+  {
+    a1[i].showMessage("this is a test");
+  }
+}