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  1. #include <type_traits>
  2.  
  3. template<typename T>
  4. class Test
  5. {
  6.     static_assert(
  7.     	std::is_same<int, T>::value ||
  8.     	std::is_same<double, T>::value ||
  9.     	std::is_same<float, T>::value, 
  10.         "T must be int, double or float"
  11.     );
  12. };
  13.  
  14. int main()
  15. {
  16. 	Test<int> t1;
  17. 	Test<char> t2;
  18. 	return 0;
  19. }
  20.  
Compilation error #stdin compilation error #stdout 0s 3092KB
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stdin
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Standard input is empty
compilation info 
prog.cpp: In instantiation of 'class Test<char>':
prog.cpp:17:13:   required from here
prog.cpp:6:5: error: static assertion failed: T must be int, double or float
     static_assert(
     ^
stdout
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Standard output is empty
https://ideone.com/VMXoi9
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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