Re: Any interest in a faster "any" type alternative?

From: Marcus Tomlinson (themarcustomlinson_at_[hidden])
Date: 2024-12-06 11:46:08

> On 6 Dec 2024, at 06:48, Antony Polukhin <antoshkka_at_[hidden]> wrote:
> 
> 
> 
> On Fri, Nov 29, 2024, 17:41 Marcus Tomlinson via Boost <boost_at_[hidden] <mailto:boost_at_[hidden]>> wrote:
>> I’m aware that the current implementation of any intentionally avoids copy assignments and uses only copy construction for all value updates. I believe this is due to the fact that copy assignment isn’t always available for all types - understandable.
> 
> 
> This could be solved via type traits.
> 
>> My proposal is what if we had a separate “fast-any” type that does utilise copy assignment when types match. In my own usage of this new type, I’ve found massive (roughly 2x) performance improvement on consecutive assignments of the same type.
>> 
>> I’d like to gauge whether there would be any interest in adding such a type to the Boost library.
>> 
>> Source code: https://github.com/cross-platform/fast_any
> 
> 
> How about just improving the existing boost::any? If the incomming type is assignable, this is not empty and its type matches the type stored in this, then call unsafe_any_cast and assing the new value
> 
> Could you please provide a PR? Thanks in advance

Yeah great idea. I’ll work on this then.

Thanks for your guidence!

>> 
>> 
>> Regards,
>> Marcus Tomlinson
>> 
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