imho: yes. without placement new there might not be an object there (modulo implicit lifetime starts that changed/extended in C++23.

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> On 1 Aug 2023, at 12:10, language.lawyer--- via Std-Discussion <std-discussion_at_[hidden]> wrote:
>
> 
>>
>> Can you clarify your question please? Are you asking about this example
>> alignas(T) std::byte storage[sizeof(T)];
>> T *ptr = ::new (&storage) T;
>> foo(reinterpret_cast<T*>(&storage));
>> or
>> alignas(T) std::byte storage[sizeof(T)];
>> foo(reinterpret_cast<T*>(&storage));
>
> Is there much difference, when `reinterpret_cast<T*>(&storage)` is considered?
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