Re: std::launder and its usage in Boost

From: Peter Dimov (pdimov_at_[hidden])
Date: 2022-02-18 16:36:44

Andrea Bocci wrote:
> Hi Andrey,
> now I'm curious... is
> 
>   alignas(int) unsigned char storage[sizeof(int)];
>   int* p1 = new (storage) int(1);
>   int* p3 = new (storage) int(3);
>   std::printf("%d\n", *p1);
> 
> different from
> 
>     int* p1 = new int(1);
>     int* p3 = new (p1) int(3);
>     std::printf("%d\n", *p1);
> 
> or even
> 
>     int p1 = 1;
>     int* p3 = new (&p1) int(3);
>     std::printf("%d\n", p1);
> 
> ?

I don't think there's any difference here.