std::align_val_t
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                    |   Defined in header  <new>
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|   enum class align_val_t : std::size_t {};  | 
(since C++17) | |
Both new-expression and delete-expression, when used with objects whose alignment requirement is greater than __STDCPP_DEFAULT_NEW_ALIGNMENT__, pass that alignment requirement as an argument of type std::align_val_t to the selected allocation/deallocation function.
Notes
Alignment (as obtained by alignof) has the type std::size_t, but placement forms of allocation and deallocation functions that take std::size_t as an additional parameter are already in use, so this type is used instead.
See also
|    allocation functions   (function)  | |
|    deallocation functions   (function)  |