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  1. #include <iostream>
  2. #include <type_traits>
  3.  
  4. template <typename DestinationType, typename SourceType>
  5. DestinationType* pod_cast(SourceType* p)
  6. {
  7. 	static_assert(std::is_fundamental<DestinationType>::value, "");
  8. 	static_assert(std::is_fundamental<SourceType>::value, "");
  9. 	return new (p) DestinationType;
  10. }
  11.  
  12. int main()
  13. {
  14. 	char c;
  15. 	char p[42];
  16. 	auto d = pod_cast<double>(p);
  17. 	char c2;
  18. 	double test = 13.37;
  19. 	*d = 67895762394.2352345;
  20. 	std::cout << *d << '\n';
  21. 	std::cout << (void*)&c << '\n';
  22. 	std::cout << (void*)p << '\n';
  23. 	std::cout << (void*)d << '\n';
  24. 	std::cout << (void*)&c2 << '\n';
  25. 	std::cout << (void*)&test << '\n';
  26. 	std::cout << "char: " << alignof(char) << '\n';
  27. 	std::cout << "short: " << alignof(short) << '\n';
  28. 	std::cout << "double: " << alignof(double) << '\n';
  29. }
Success #stdin #stdout 0s 2828KB
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stdin
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Standard input is empty
stdout
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6.78958e+10
0xbff9287f
0xbff92846
0xbff92846
0xbff9287e
0xbff92870
char: 1
short: 2
double: 8
https://ideone.com/MGK2o
language:
C++14 (gcc 8.3)
created:
12 years ago
visibility:
public

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