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  1. #include <iostream>
  2.  
  3. template <class T>
  4. struct X {
  5.     using value_type = T;
  6.     T value;
  7. };
  8.  
  9. template <class Y, class T = typename Y::value_type>
  10. void f(Y& y) {
  11.     T value = 42;
  12.     y.value = value;
  13. }
  14.  
  15. int main() {
  16.     X<int> x;
  17.     f(x);
  18.     std::cout << x.value << std::endl;
  19.     return 0;
  20. }
  21.  
Success #stdin #stdout 0s 16048KB
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stdin
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Standard input is empty
stdout
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42
https://ideone.com/QaLeKP
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
secret

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