String Klasse

    #include <iostream>
    #include <utility> //für swap
    #include <cstring> //für strcpy und strlen
    using namespace std;

    class String
    {
    private:
      char* value;

    public:
      String(char const* value="")
      : value(new char[strlen(value)+1])
      {
        strcpy(this->value, value);
      }

      String(String const& other)
      : value(new char[other.length()+1])
      {
        strcpy(this->value, other.value);
      }

      ~String()
      {
        delete [] value;
      }

      String const& operator=(String const& other)
      {
        String temp(other);
        swap(temp);
        return *this;
      }

      void swap(String& other)
      {
        ::swap(value, other.value); //globales swap
      }

      char const* c_str() const
      {
        return value;
      }

      char& operator[](int index)
      {
        return value[index];
      }

      char const& operator[](int index) const
      {
        return value[index];
      }

      int length() const
      {
        return strlen(value);
      }
    };

    int main()
    {
      String s;
      String s1("Hallo Welt");

      s=s1;

      cout<<s.c_str()<<'\n';
    }