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  1. #include <iostream>
  2. #include <cstring>
  3.  
  4. using std::strlen;
  5.  
  6. struct string
  7. {
  8.     char *buffer;
  9.     std::size_t len;
  10.  
  11.     string() : buffer(nullptr), len(0)
  12.     {}
  13.     string(char const *str) : buffer(new char[strlen(str) + 1]), len(strlen(str))
  14.     {
  15.         std::strcpy(buffer, str);
  16.     }
  17.     string(string const& other) : buffer(other.data()), len(other.size())
  18.     {}
  19.  
  20.     string& operator +=(string const& other)
  21.     {
  22.         std::strcat(buffer, other.data());
  23.  
  24.         return *this;
  25.     }
  26.  
  27.     char *data() const { return buffer; }
  28.  
  29.     std::size_t size() const { return len; }
  30. };
  31.  
  32. std::ostream& operator <<(std::ostream& os, string const& str)
  33. {
  34.     return os << str.data();
  35. }
  36.  
  37. int main()
  38. {
  39.     string s1 = "Hello", s2 = " World";
  40.  
  41.     s1 += s2;
  42.  
  43.     std::cout << s1;
  44. }
Success #stdin #stdout 0s 2984KB
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stdin
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Standard input is empty
stdout
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Hello World
https://ideone.com/8GJBRp
language:
C++14 (gcc 8.3)
created:
12 years ago
visibility:
secret

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