Move semantics and RVO/NRVO

Author: Wang Jiazi

C++/RVO_NRVO/MoveAndRVO/Makefile

@@ -0,0 +1,13 @@
+all:RVO NRVO
+RVO: rvo.cpp
+	g++ rvo.cpp -std=c++11 -o $@
+NRVO: nrvo.cpp
+	g++ nrvo.cpp -std=c++11 -o $@
+
+run:
+	./RVO
+	@echo -e "+++++++++++++++++++++++++++++++++++\n\n"
+	./NRVO
+
+clean:
+	rm -rf RVO NRVO

C++/RVO_NRVO/MoveAndRVO/nrvo.cpp

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+#include "object.h"
+
+int main()
+{
+    {
+        std::cout << "==============================\n";
+        auto obj1 = getTestWithName();
+        std::cout << "===========================\n";
+    }
+
+    {
+        std::cout << "\n===========================\n";
+        auto obj2 = std::move(getTestWithName());
+        std::cout << "===========================\n";
+    }
+
+    {
+        std::cout << "\n===========================\n";
+        Test obj3; obj3 = getTestWithName();
+        std::cout << "===========================\n";
+    }
+
+    {
+        std::cout << "\n===========================\n";
+        Test obj4; obj4 = std::move(getTestWithName());
+        std::cout << "===========================\n";
+    }
+}

C++/RVO_NRVO/MoveAndRVO/object.h

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+#include <iostream>
+#include <vector>
+#include <string>
+
+struct Test {
+    Test()
+    {
+        std::cout << "Construct function" << std::endl;
+    }
+
+    Test(const Test&)
+    {
+        std::cout << "Copy construct function" << std::endl;
+    }
+
+    Test& operator=(const Test&)
+    {
+        std::cout << "Copy assignment function" << std::endl;
+        return *this;
+    }
+
+
+    Test(Test&&)
+    {
+        std::cout << "Move construct function" << std::endl;
+    }
+
+
+    Test& operator=(Test &&t)
+    {
+        std::cout << "Move assignment Function" << std::endl;
+        return *this;
+    }
+
+    ~Test()
+    {
+        std::cout << "Destruct function" << std::endl;
+    }
+};
+
+Test getTest()
+{
+    return Test();
+}
+
+Test getTestWithName()
+{
+    Test temp;
+    return temp;
+}

C++/RVO_NRVO/MoveAndRVO/rvo.cpp

@@ -0,0 +1,28 @@
+#include "object.h"
+
+int main()
+{
+    {
+        std::cout << "==============obj1 = getTest()================\n";
+        auto obj1 = getTest();
+        std::cout << "===========================\n";
+    }
+
+    {
+        std::cout << "\n=============obj2 = std::move(getTest())==============\n";
+        auto obj2 = std::move(getTest());
+        std::cout << "===========================\n";
+    }
+
+    {
+        std::cout << "\n===========================\n";
+        Test obj3; obj3 = getTest();
+        std::cout << "===========================\n";
+    }
+
+    {
+        std::cout << "\n===========================\n";
+        Test obj4; obj4 = std::move(getTest());
+        std::cout << "===========================\n";
+    }
+}