This does exactly what you want:
decltype(auto) func(C auto ...args)

On Sun, May 1, 2022 at 4:08 AM Abdullah Qasim via Std-Proposals
<std-proposals_at_[hidden]> wrote:
>
> But then ALL types are accepted!
>
>
>
> I just want to accept vars of types that comply with concept C
>
>
>
> From: Peter C++ via Std-Proposals
> Sent: 01 May 2022 13:06
> To: std-proposals_at_[hidden]
> Cc: Peter C++
> Subject: Re: [std-proposals] concepts in function param list
>
>
>
> learn the language! available with adding the keyword auto at appropriate place.
>
>
>
>
>
> sent from a mobile device so please excuse strange words due to autocorrection.
>
> Peter Sommerlad
>
> peter.cpp_at_[hidden]
>
> +41-79-432 23 32
>
>
>
> On 1 May 2022, at 10:03, Abdullah Qasim via Std-Proposals <std-proposals_at_[hidden]> wrote:
>
> 
>
>
>
> Why must we do this:
>
>
>
> // concept C
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> template <C ...T >
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> decltype(auto) func (T ...args)
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> {
>
> return args + ...;
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> }
>
>
>
> So unnecessary!
>
>
>
> Why not:
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>
>
> decltype(auto) func (C ...args)
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> {
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> Return args + ...;
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> }
>
>
>
> ??
>
>
>
> Not hard to implement, as auto in param list is already implemented.
>
> This would help lots, & would speed up coding, making it more maintainable too!
>
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