Hello,

Il 30/01/23 13:04, Marcin Jaczewski via Std-Proposals ha scritto:
> T z = {};
> std::array<char, sizeof(z)> a = {};
> return std::bit_cast<decltype(a)>(z) == a;
> }
> ```
>
> It looks like it works for GCC and Clang,
> it needs some guards to allow only simple types (no e.g. `std::string`),
> but the core of this functionality is already available.

It's already in the paper:

https://isocpp.org/files/papers/D2782R0.html#usercode

TL;DR: doesn't work in the general case. You can't bit_cast pointers
during constant evaluation, and it's too strict on the requirements on `T`.

Thanks,

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Giuseppe D'Angelo | giuseppe.dangelo_at_[hidden] | Senior Software Engineer
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