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  1. #include <iostream>
  2. #include <cstdint>
  3. using namespace std;
  4.  
  5. template<class T>
  6. class integer_IO
  7. {
  8.   T &val;
  9.  
  10. public:
  11.  
  12.   integer_IO(T &arg) : val(arg) {}
  13.  
  14.   friend istream &operator>> (istream &is, integer_IO<T> &&i)
  15.   {
  16.     decltype(+(i.val)) hlp;
  17.     is >> hlp;
  18.     i.val = hlp;
  19.     return is;
  20.   }
  21.  
  22.   friend ostream &operator<< (ostream &os, integer_IO<T> const &&i)
  23.   {
  24.     os << +(i.val);
  25.     return os;
  26.   }
  27. };
  28.  
  29. template<class T>
  30. integer_IO<T> intIO(T &arg)
  31. {
  32.   return integer_IO<T>(arg);
  33. }
  34.  
  35. int main()
  36. {
  37.   int_least8_t i;
  38.   cin >> intIO(i);
  39.   cout << intIO(i) << '\n';
  40. }
Success #stdin #stdout 0s 3460KB
comments (?)
stdin 
49
stdout 
49
https://ideone.com/NTx6UI
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

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