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  1. #include <iostream>
  2. #include <type_traits>
  3. using namespace std;
  4.  
  5. struct C { int m; };
  6. int i =  42;
  7. int&& f() { return std::move(i); }
  8.  
  9. static_assert(std::is_same<
  10.     decltype(&C::m),
  11.     int C::*>::value, "");
  12. static_assert(std::is_same<
  13.     decltype(&(C::m)),
  14.     int*>::value, "");
  15.  
  16. static_assert(std::is_same<
  17.     decltype(i),
  18.     int>::value, "");
  19. static_assert(std::is_same<
  20.     decltype((i)),
  21.     int&>::value, "");
  22.  
  23. auto x1= i;
  24. auto x2 = f();
  25. static_assert(std::is_same<
  26.       decltype(x1),
  27.       int>::value, "");
  28. static_assert(std::is_same<
  29.       decltype(x2),
  30.       int>::value, "");
  31. static_assert(std::is_same<
  32.       decltype(f()),
  33.       int&&>::value, "");
  34.  
  35. decltype(auto) x5 = i;
  36. decltype(auto) x6 = (i);
  37. decltype(auto) x7 = f();
  38.  
  39. static_assert(std::is_same<
  40.       decltype(x5),
  41.       int>::value, "");
  42. static_assert(std::is_same<
  43.       decltype(x6),
  44.       int&>::value, "");
  45. static_assert(std::is_same<
  46.       decltype(x7),
  47.       int&&>::value, "");
  48.  
  49. int main() {
  50. 	// your code goes here
  51.     std::cout << "hello\n";
  52. 	return 0;
  53. }
Success #stdin #stdout 0s 15240KB
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stdin
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Standard input is empty
stdout
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hello
https://ideone.com/xyEOmd
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

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