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  1. #include <iostream>
  2. #include <iomanip>
  3. using namespace std;
  4.  
  5. template <typename T> 
  6. T constexpr mask101() 
  7. {
  8. 	T ret = 0;
  9. 	for(T mask=1;mask;mask<<=2)
  10. 	{
  11. 		ret|=mask;
  12. 	}
  13. 	return ret;
  14. }
  15.  
  16. int main() 
  17. {
  18. 	constexpr auto test = mask101<size_t>();
  19. 	cout << std::hex <<"0x" << test << endl;
  20. 	cout << std::hex <<"0x" << mask101<int32_t>() << endl;
  21. 	cout << std::hex <<"0x" << mask101<uint16_t>() << endl;
  22. 	cout << std::hex <<"0x" << int(mask101<int8_t>()) << endl;
  23. 	return 0;
  24. }
Success #stdin #stdout 0.01s 5344KB
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stdin
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Standard input is empty
stdout
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0x5555555555555555
0x55555555
0x5555
0x55
https://ideone.com/sE0X3S
language:
C++14 (gcc 8.3)
created:
3 years ago
visibility:
secret

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