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  1. #include <iostream>
  2.  
  3. template <class T>
  4. class B
  5. {
  6. public:
  7.  
  8.     B()
  9.     {
  10.         std::cout << "Constructing with default ctor\n";
  11.     }
  12.  
  13.     B(int)
  14.     {
  15.         std::cout << "Initializing with int param\n";
  16.     }
  17.  
  18.     B(double)
  19.     {
  20.         std::cout << "Initializing with double param\n";
  21.     }
  22. };
  23.  
  24. template <class T>
  25. class A
  26. {
  27. public:
  28.  
  29.     static const B<T> member;
  30. };
  31.  
  32. // for an int
  33. template<>
  34. const B<int> A<int>::member(3);
  35.  
  36. // for a double
  37. template<>
  38. const B<double> A<double>::member(50.3);
  39.  
  40. // use no-arg constructur with A<void>
  41. template<>
  42. const B<void> A<void>::member; // = B<void>();
  43.  
  44.  
  45. int main(int argc, char* argv[])
  46. {
  47.     // (printing so I don't get a warning, which will be treated as an error)
  48.     std::cout << &A<int>::member;
  49.     std::cout << &A<double>::member;
  50.     std::cout << &A<void>::member;
  51.  
  52.     return 0;
  53. }
Compilation error #stdin compilation error #stdout 0s 0KB
comments (?)
stdin
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Standard input is empty
compilation info 
/home/utPpcC/ccyIybHG.o: In function `main':
prog.cpp:(.text.startup+0x35): undefined reference to `A<void>::member'
collect2: error: ld returned 1 exit status
stdout
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Standard output is empty
https://ideone.com/j9xM0N
language:
C++ (gcc 8.3)
created:
12 years ago
visibility:
public

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