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Subject: Re: [std-proposals] Constexpr std::type_info::hash_code()
From: Arthur O'Dwyer (arthur.j.odwyer_at_[hidden])
Date: 2020-12-05 08:51:56


On Sat, Dec 5, 2020 at 9:05 AM darkdragon via Std-Proposals <
std-proposals_at_[hidden]> wrote:

> It would be awesome if a constexpr version of hash_code() and
> preferably name() would be included in the standard. Is there anything
> more constexpr than type_info?
>

Sadly, yes; `type_info` is intimately tied up with RTTI, and many
implementations implement type_info::operator== as a string-comparison of
the names of the types, so that it'll keep working even in the presence of
dynamically linked libraries (DLLs).

So your goal might not be literally *impossible*, but it won't be trivial,
either.

-Arthur



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