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  1. #include <iostream>
  2. #include <tuple>
  3.  
  4. template<typename Tuple> class wrapped_tuple;
  5.  
  6. template<size_t I, typename Tuple>
  7. typename std::tuple_element<I, Tuple>::type&
  8. Get(wrapped_tuple<Tuple>& w) {
  9.   return std::get<I>(w.tuple_);
  10. }
  11.  
  12. template<typename Tuple> class wrapped_tuple {
  13.   template<size_t I, typename Uple>
  14.   friend typename std::tuple_element<I, Uple>::type&
  15.          ::Get(wrapped_tuple<Uple>& w);
  16.   public:
  17.     wrapped_tuple(Tuple& t) : tuple_(t) {}
  18.   private:
  19.     Tuple& tuple_;
  20. };
  21.  
  22. template<typename Tuple>
  23. wrapped_tuple<Tuple> wrap_tuple(Tuple& tup) {
  24.   return wrapped_tuple<Tuple>(tup);
  25. }
  26.  
  27. int main() {
  28.   using std::get;
  29.   std::tuple<int, double, short> tup(1, 3.14159, 32767);
  30.   auto w = wrap_tuple(tup);
  31.   Get<0>(w) = 7;
  32.   Get<1>(w) *= 2;
  33.   ++Get<2>(w);
  34.   std::cout << get<0>(tup) << ' ' << get<1>(tup) << ' ' << get<2>(tup) << std::endl;
  35.   return 0;
  36. }
Success #stdin #stdout 0s 2928KB
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Standard input is empty
stdout
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7 6.28318 -32768
https://ideone.com/toCSri
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
public

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