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  1.     #include <iostream>
  2.     #include <type_traits>
  3.  
  4.     int main() 
  5.     {
  6.         using storage_type = 
  7.             std::aligned_storage<sizeof(double), alignof(double)>::type;
  8.         using union_storage_type =
  9.             std::aligned_union<sizeof(double), double>::type;
  10.  
  11.         storage_type storage;
  12.         union_storage_type union_storage;
  13.  
  14.         std::cout << sizeof(storage_type) << '\n';
  15.         std::cout << sizeof(union_storage_type) << '\n';
  16.         std::cout << sizeof(storage) << '\n';
  17.         std::cout << sizeof(union_storage) << '\n';
  18.         std::cout << sizeof(double) << '\n';
  19.         return 0;
  20.     }
Success #stdin #stdout 0s 3460KB
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https://ideone.com/erZDp7
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

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