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  1. #include <algorithm>
  2. #include <cstring>
  3. #include <iostream>
  4.  
  5. class A
  6. {
  7.     public:
  8.        // construct from string
  9.        A () : str(new char[1]()) {}
  10.  
  11.        A(const char *s) : str(new char[strlen(s) + 1])
  12.        { strcpy(str, s); }
  13.  
  14.        // copy construct
  15.        A(const A& rhs) : str(new char[strlen(rhs.str) + 1])
  16.        { strcpy(str, rhs.str); }
  17.  
  18.        // destruct
  19.        ~A() { delete []  str; }
  20.  
  21.        // assign
  22.        A& operator=(const A& rhs)
  23.        {
  24.           A temp(rhs);
  25.           std::swap(str, temp.str);
  26.           return *this;
  27.        }
  28.  
  29.        // implement
  30.        void setStr(char * s)
  31.        {
  32.           A temp(s);
  33.           *this = temp;
  34.        }  
  35.  
  36.        const char* getStr() { return str; }
  37.  
  38.      private:
  39.         char * str;
  40. };
  41.  
  42. using namespace std;
  43.  
  44. int main()
  45. {
  46. 	A a1;
  47. 	a1.setStr("abc");
  48. 	A a2;
  49. 	a2 = a1;
  50. 	A a3 = a1;
  51. 	a2.setStr("456");
  52. 	cout << a1.getStr() << "\n" << a2.getStr() << "\n" << a3.getStr();
  53. }
  54.  
  55.  
Success #stdin #stdout 0s 3456KB
comments (?)
stdin
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Standard input is empty
stdout
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abc
456
abc
https://ideone.com/1iL8yj
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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