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  1. #include <iostream>
  2. #include <cstring>
  3.  
  4. class MyString
  5. {
  6. public:
  7.     MyString() : data(nullptr) {}
  8.  
  9.     ~MyString()
  10.     {
  11.         delete[] data;
  12.     }
  13.  
  14.     MyString(const MyString& other) //copy constructor
  15.     { 
  16.         data = new char[strlen(other.c_str()) + 1]; // another allocation
  17.         strcpy(data, other.c_str()); // copy over the old string buffer
  18.     }
  19.  
  20.     MyString(MyString&& other)
  21.     {
  22.         data = other.data;
  23.         other.data = nullptr;
  24.     }
  25.  
  26.     void set(const char* str)
  27.     {
  28.         char* newString = new char[strlen(str) + 1];
  29.         strcpy(newString, str);
  30.         delete[] data;
  31.         data = newString;
  32.     }
  33.  
  34.     const char* c_str() const
  35.     {
  36.         return data;
  37.     }
  38. private:
  39.     char* data;
  40. };
  41.  
  42.  
  43. int main()
  44. {
  45.     MyString str;
  46.     str.set("test");
  47.     std::cout << str.c_str() << "\n";
  48.     MyString anotherStr(str); // copy over contents.
  49.     std::cout << anotherStr.c_str() << "\n";
  50.     MyString AndAnotherOne(std::move(str)); // now _move_ str into AndAnotherOne
  51.     std::cout << AndAnotherOne.c_str() << "\n"; // we shouldn't use `str` now anymore as it's data has been "stolen"
  52.     std::cin.get();
  53. }
Success #stdin #stdout 0s 3464KB
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test
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https://ideone.com/Y2exAO
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

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