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  1.     #include <iostream>
  2.     #include <string>
  3.     #include <cstdlib>
  4.     #include <cstring>
  5.  
  6.     class StrStrTest
  7.     {
  8.     public:
  9.         StrStrTest(const std::string& ba)
  10.         {
  11.             a = (char*)calloc(1, ba.length() + 1);
  12.             strcpy(a, ba.c_str());
  13.         }
  14.  
  15.         virtual ~StrStrTest()
  16.         {
  17.             free(a);
  18.         }
  19.     private:
  20.         char* a;
  21.  
  22.         friend std::basic_ostream<char>& operator << (std::basic_ostream<char>& ss, const StrStrTest& a);
  23.         friend std::basic_istream<char>& operator >> (std::basic_istream<char>& ss, const StrStrTest& a);
  24.     };
  25.  
  26.     std::basic_ostream<char>& operator << (std::basic_ostream<char>& ss, const StrStrTest& a)
  27.     {
  28.         ss << a.a;
  29.         return ss;
  30.     }
  31.  
  32.  
  33.     std::basic_istream<char>& operator >> (std::basic_istream<char>& ss, const StrStrTest& a)
  34.     {
  35.         ss >> a.a;
  36.     //    a.a = NULL;
  37.         return ss;
  38.     }
  39.  
  40.     int main()
  41.     {
  42.         StrStrTest bb("foo");
  43.         std::cin >> bb;
  44.         std::cout << bb;
  45.     }
Success #stdin #stdout 0s 3476KB
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Standard input is empty
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foo
https://ideone.com/3Ky4Kr
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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