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  1. #include<cstring>
  2. #include<iostream>
  3.  
  4. class stringb
  5. {
  6.  
  7. public:
  8.     stringb() :
  9.         p (new char[25]), len(25)
  10.     {
  11.     }
  12.      stringb(char* s) :
  13.         p (new char[std::strlen(s)])
  14.     {
  15.         len = std::strlen(s);
  16.         std::strcpy (p, s );
  17.     }
  18.  
  19.     stringb (const stringb& other) :
  20.         p (new char[std::strlen (other.p) + 1]), len(std::strlen (other.p))
  21.     {
  22.         std::strcpy (p, other.p );
  23.     }
  24.  
  25.     /** Move Constructor  Since C++11*/
  26.     stringb (stringb&& other) :
  27.         p (other.p),len(0)
  28.     {
  29.         other.p = nullptr;
  30.     }
  31.  
  32.     /** Destructor */
  33.     ~stringb()
  34.     {
  35.         delete[] p;
  36.     }
  37.  
  38.     /** Copy Assignment Operator */
  39.     stringb& operator= (const stringb& other)
  40.     {
  41.         stringb temporary (other);
  42.         std::swap (p, temporary.p);
  43.         return *this;
  44.     }
  45.  
  46.     /** Move Assignment Operator Since C++11*/
  47.     stringb& operator= (stringb&& other)
  48.     {
  49.         std::swap (p, other.p);
  50.         return *this;
  51.     }
  52.  
  53. private:
  54.     char* p;  
  55.     std::size_t len;
  56.         friend std::ostream& operator<< (std::ostream& os, const stringb& stringb)
  57.     {
  58.         os << stringb.p;
  59.         return os;
  60.     }
  61.  
  62.  
  63.     friend stringb operator+(const stringb &a,const stringb &b)
  64.     {
  65.         stringb temp;
  66.         temp.len = a.len + b.len;
  67.         temp.p=new char[(temp.len)+1];
  68.         std::strcpy(temp.p, a.p);
  69.         std::strcat(temp.p, b.p);
  70.         return (temp);
  71.     }
  72.  
  73.     /* Not sure what this will do */
  74.     friend stringb operator-(const stringb &a,const stringb &b)
  75.     {   
  76.         stringb temp;
  77.         temp.len=a.len-b.len;
  78.         temp.p=new char[temp.len+1];
  79.         std::strcpy(temp.p,a.p);
  80.         return (temp);
  81.     }
  82. };
  83.  
  84.  
  85.  
  86. int main()
  87. {
  88.     stringb a("POW");
  89.     stringb b("JACK");
  90.  
  91.     stringb c;
  92.     c=a+b;
  93.     std::cout<< c<< ","<<a<<","<<b;
  94. }
Success #stdin #stdout 0s 3428KB
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POWJACK,POW,JACK
https://ideone.com/0EjAoQ
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
public

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