move semantics tutorial program from https://www.youtube.com/watch?v=ehMg6zvXuMY "The Cherno"

move-semantics.cpp

#include <iostream>
#include <cstring>

class String
{
public:
    String () = default;
    
    String (const char* string)
    {
        printf("Created!\n");
        m_Size = strlen (string);
        m_Data = new char[m_Size];
        memcpy(m_Data, string, m_Size);
    }
    String (const String& other)
    {
        printf ("Copied!\n");
        m_Size = other.m_Size;
        m_Data = new char[m_Size];
        memcpy (m_Data, other.m_Data, m_Size);
    }

    String (String&& other) noexcept
    {
        printf ("Moved!\n");
        m_Size = other.m_Size;
        m_Data = other.m_Data;

        other.m_Size = 0;
        other.m_Data = nullptr;
    }

    ~String()
    {
        printf("Destroyed!\n");
        delete m_Data;
    }

    void Print ()
    {
        for (uint32_t i = 0; i < m_Size; i++)
            printf ("%c", m_Data[i]);
        printf ("\n");
    }
private:
    char* m_Data;
    uint32_t m_Size;
};

class Entity
{
public:
    Entity (const String& name)
        : m_Name(name)
    {
    }

    Entity(String&& name)
        : m_Name(std::move(name))
    {
    }

    void PrintName()
    {
        m_Name.Print();
    }
private:
    String m_Name;
};

int main(int argc, char *argv[])
{
    Entity entity(String("foo")); // Could have also just used "foo" which would do an implicit conversion.
    entity.PrintName();

    std::cin.get();
    return 0;
}