TheArtOfHPC_vol3_cppf08programming/Code/object/rv.cpp

/*
 * from https://thispointer.com/c11-move-contsructor-rvalue-references/
 */

#include <iostream>
#include <vector>
class Container {
    int * m_Data;
public:
    Container() {
        //Allocate an array of 20 int on heap
        m_Data = new int[20];
    }
    ~Container() {
        if (m_Data) {
	  std:: cout << "delete data " << '\n';
            delete[] m_Data;
            m_Data = NULL;
        } else
	  std:: cout << "delete tail " << '\n';	
    }
    //Copy Constructor
    Container(const Container & obj) {
        //Allocate an array of 20 int on heap
        m_Data = new int[20];
        //Copy the data from passed object
        for (int i = 0; i < 20; ++i)
            m_Data[i] = obj.m_Data[i];
        std::cout << "Copy Constructor: Allocation 20 int" << '\n';
    }
    //Assignment Operator
    Container & operator=(const Container & obj) {
        if(this != &obj)
        {
            //Allocate an array of 20 int on heap
            m_Data = new int[20];
            //Copy the data from passed object
            for (int i = 0; i < 20; ++i)
                m_Data[i] = obj.m_Data[i];
            std::cout << "Assigment Operator: Allocation 20 int" << '\n';
        }
	return *this;
    }
    // Move Constructor
    Container(Container && obj)
    {
        // Just copy the pointer
        m_Data = obj.m_Data;
        // Set the passed object's member to NULL
        obj.m_Data = NULL;
        std::cout<<"Move Constructor"<< '\n';
    }
    // Move Assignment Operator
    Container& operator=(Container && obj)
    {
        if(this != &obj)
        {
            // Just copy the pointer
            m_Data = obj.m_Data;
            // Set the passed object's member to NULL
            obj.m_Data = NULL;
            std::cout<<"Move Assignment Operator"<< '\n';
        }
	return *this;
    }
};
// Create am object of Container and return
Container getContainer()
{
    Container obj;
    return obj;
}
int main() {
    // Create a vector of Container Type
    std::vector<Container> vecOfContainers;
    //Add object returned by function into the vector
    vecOfContainers.push_back(getContainer());
    Container obj;
    obj = getContainer();
    return 0;
}