fork(3) download 
  1. #include <iostream>
  2. #include <type_traits>
  3.  
  4. template <std::size_t SIZE> class A
  5. {
  6.     char b[SIZE];
  7.  
  8. public:
  9. 	using const_buffer_t = const char (&)[SIZE];
  10.  
  11. 	A()                               : b{} { std::cout << "size: " << SIZE << " ctor 1\n"; }
  12. 	A(const_buffer_t)                 : b{} { std::cout << "size: " << SIZE << " ctor 2\n"; }
  13. 	explicit A(const A&)              : b{} { std::cout << "size: " << SIZE << " ctor 4\n"; }
  14.  
  15. 	template <typename T,
  16. 	  typename=typename std::enable_if<
  17. 	    std::is_same<typename std::remove_cv<T>::type, char>{}
  18. 	  >::type>
  19. 	A(T* const&)                      : b{} { std::cout << "size: " << SIZE << " ctor 3\n"; }
  20.  
  21. 	template <std::size_t OTHER_SIZE>
  22. 	A(const char (&)[OTHER_SIZE])     : b{} { std::cout << "size: " << SIZE << " ctor 5\n"; }
  23.  
  24. 	template <std::size_t OTHER_SIZE>
  25. 	explicit A(const A<OTHER_SIZE> &) : b{} { std::cout << "size: " << SIZE << " ctor 6\n"; }
  26. };
  27.  
  28. int main()
  29. {
  30. 	A<5> a("five");
  31. 	A<5> b("0123456789");
  32. 	A<9> c(a);
  33. 	A<5> d;
  34. 	A<5> e(d);
  35. 	A<9> f(d);
  36. }
  37.  
Success #stdin #stdout 0s 3296KB
comments (?)
stdin 
Standard input is empty
stdout 
size: 5 ctor 2
size: 5 ctor 5
size: 9 ctor 6
size: 5 ctor 1
size: 5 ctor 4
size: 9 ctor 6
https://ideone.com/LUGs60
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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