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  1. #include <iostream>
  2. #include <vector>
  3. #include <string>
  4.  
  5. template <typename M, typename T> void process(M&, T&);
  6.  
  7. template <typename M, typename T>
  8. void process_impl(M& m, const T& t) {
  9.   m.write(t);
  10. }
  11. template <typename M, typename T>
  12. void process_impl(M& m, const std::vector<T>& v) {
  13.   for (const auto& t: v) {
  14.     process(m, t);
  15.   }
  16. }
  17.  
  18. template <typename M, typename T>
  19. void process(M& m, const T& t) {
  20.   process_impl(m, t);
  21. }
  22.  
  23. struct media {
  24.   template <typename T> void write(const T& t) { std::cout << t << std::endl; }
  25. };
  26. void process(media& m, const std::string& s) {
  27.   process(m, s.size());
  28. }
  29.  
  30. template <typename M>
  31. struct debug_media {
  32.   template <typename T> void write(const T& t) { m.write(t); }
  33.  
  34.   media m;
  35. };
  36. template <typename M, typename T>
  37. void process(debug_media<M>& d, const T& t) {
  38.   std::cout << "debug: ";
  39.   process(d.m, t);
  40. }
  41.  
  42. int main() {
  43. 	{
  44.     	media m;
  45.         process(m, std::vector<std::string>{"1", "22"});
  46. 	}
  47. 	{
  48.     	debug_media<media> m;
  49.         process(m, std::vector<std::string>{"1", "22"});
  50. 	}
  51. 	return 0;
  52. }
Success #stdin #stdout 0s 3476KB
comments (?)
stdin 
Standard input is empty
stdout 
1
2
debug: 1
2
https://ideone.com/wP8ROU
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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