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P1317R2 Remove return type deduction in std::apply #7999

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P1317R2 Remove return type deduction in std::apply #7999

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@jwakely jwakely commented Jun 23, 2025

Fixes #7972

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jwakely commented Jun 23, 2025

I think we should bump __cpp_lib_apply for this.

Eisenwave
Eisenwave requested changes Jun 23, 2025
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@jwakely jwakely force-pushed the motions-2025-06-lwg-35 branch 2 times, most recently from 6998833 to 264537b Compare June 23, 2025 18:14
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P1317R2 Remove return type deduction in std::apply
a1e2efa 
This commit adds "tuple-like<Tuple> is true and" to the definition of
apply_result. LWG noticed this was needed but we were unable to contact
the paper author to make the change in time for plenary.
@jwakely jwakely force-pushed the motions-2025-06-lwg-35 branch from 264537b to a1e2efa Compare June 23, 2025 18:17
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jwakely commented Jun 23, 2025

I think we should bump __cpp_lib_apply for this.

I raised this on mattermost and got agreement. I was going to do it in a fixup commit, but I realised we might want to consider whether to add the macro to <type_traits>. It's currently only in <tuple> (and <version> of course).

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[2025-06 LWG Motion 35] P1317R2 Remove return type deduction in std::apply
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