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[expr.prim.lambda.capture]/8 Add a note explaining when capture is required #5824

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blackteahamburger opened this issue Sep 12, 2022 · 3 comments · Fixed by #5847
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[expr.prim.lambda.capture]/8 Add a note explaining when capture is required #5824

blackteahamburger opened this issue Sep 12, 2022 · 3 comments · Fixed by #5847
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@jensmaurer

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@blackteahamburger
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If a lambda-expression or an instantiation of the function call operator template of a generic lambda odr-uses (6.2) this or a variable with automatic storage duration from its reaching scope, that entity shall be captured by the lambda-expression.

in [expr.prim.lambda.capture]/8 has been moved to [basic.def.odr]/9 because of P0588R1. So now there is no relevant description in [expr.prim.lambda.capture]/8, which can be confusing.
@jensmaurer
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jensmaurer commented Sep 13, 2022 •
edited

We could add a cross-reference to basic.def.odr after "odr-usable", which is the first appearance of the term here, if that clarifies things.

Otherwise, I'm not seeing a problem here.

@blackteahamburger
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blackteahamburger commented Sep 14, 2022 •
edited

I think it would be useful to explain it, since it is about lambda-expression after all.

@jensmaurer
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The standard is not a tutorial. If we have complicated rules, we shouldn't try to paraphrase them (likely incorrectly) in notes; we should add a cross-reference and that's it.

@jensmaurer jensmaurer self-assigned this Sep 17, 2022
@jensmaurer jensmaurer mentioned this issue Sep 17, 2022
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[expr.prim.lambda.capture] Cross-reference [basic.def.odr] for 'odr-usable' jensmaurer/draft
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@jensmaurer @blackteahamburger