#include #include class String { private: char* m_buffer; int m_size; public: String(const char* str) { // the length of str with for loop method m_size = 0; for(; str[m_size] != '\0'; m_size++) {} // increment m_size to make a place for'\0' m_buffer = new char[m_size++]; // assign str to m_buffer with for loop method for(int i = 0; i < m_size; i++) m_buffer[i] = str[i]; m_buffer[m_size] = 0; } String(const String& other) : m_size(other.m_size) { m_buffer = new char[m_size]; for(int i = 0; i < m_size; i++) m_buffer[i] = other.m_buffer[i]; } void ChangeString(char* str) { int strSize = 0; for(; str[strSize] != '\0'; strSize++) {} if(strSize <= m_size) { for(int i = 0; i < m_size; i++) m_buffer[i] = str[i]; } else { std::cout << str << " is too big [Max: " << m_size << "]\n"; } } ~String() { std::cout << m_buffer << " [DELETED]" << std::endl; delete[] m_buffer; } friend std::ostream& operator<<(std::ostream& stream, const String& objStr) { return stream << objStr.m_buffer; } }; int main() { String name1("Alex"); String name2(name1); std::cout << name1 << std::endl; std::cout << name2 << std::endl; std::cout << "Change Name..\n"; name1.ChangeString("Mike"); std::cout << name1 << std::endl; std::cout << name2 << std::endl; std::cout << "The end of program..\n"; }

Copy Constructor (Deep Copy)