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[variant.visit]p3 What is mi? What is Variantsi? #4528

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burblebee opened this issue Feb 26, 2021 · 2 comments
Open

[variant.visit]p3 What is mi? What is Variantsi? #4528

burblebee opened this issue Feb 26, 2021 · 2 comments

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@burblebee
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burblebee commented Feb 26, 2021 •
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mi is used but never specified. m is specified with "Let m be a pack of n values of type size_t" but it's not clear what mi is supposed to from that. We need text to introduce mi with something like:
for all $0 \leq i < n$, where $m_i$ is ...
Variantsi also needs an introduction (as johelegp points out).
@burblebee burblebee mentioned this issue Feb 26, 2021
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@JohelEGP
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Variantsi isn't defined either. But Variants and m both have in common that they're a pack. Perhaps the subclase needs an introduction along the lines of "Let _X_i be the ith element of the pack X".

@burblebee burblebee changed the title [variant.visit]p3 What is mi? [variant.visit]p3 What is mi? What is Variantsi? Feb 26, 2021
@tkoeppe
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tkoeppe commented Mar 9, 2021

We've used the same notation elsewhere, e.g. for tuple. The subscript indexes the pack elements. See [tuple.cnstr]. Maybe similar wording is needed here?

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@tkoeppe @burblebee @JohelEGP