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[dcl.typedef] p2 Unexplained lookup "error" in example #5107

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jensmaurer opened this issue Nov 13, 2021 · 2 comments · Fixed by #5108
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[dcl.typedef] p2 Unexplained lookup "error" in example #5107

jensmaurer opened this issue Nov 13, 2021 · 2 comments · Fixed by #5108
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jensmaurer commented Nov 13, 2021 •
edited 

using cell = pair<void*, cell*>;    // error

Two issues: pair is undefined here (is it std::pair?) and the error is unexplained.
The explanation for the error is in [basic.scope.pdecl] p4:

The locus of a using-declarator that does not name a constructor is immediately after the using-declarator (9.9).

Source: Vladimir Grigoriev on std-discussion 2021-11-13
@jensmaurer jensmaurer mentioned this issue Nov 13, 2021
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xmh0511 commented Nov 15, 2021 •
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It seems there is nothing related to using-declarator since the declaration is not a using-declaration; it's just an alias-declaration. Presumably, the explanation is in [basic.scope.pdecl] p3

The locus of an alias-declaration is immediately after it.

So, the name cannot be found until the end of the alias-declaration.

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jensmaurer commented Nov 15, 2021 •
edited

Oh, right, I was confused.

@jensmaurer jensmaurer self-assigned this Nov 20, 2021
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[dcl.typedef] Add explanation for lookup failure in example jensmaurer/draft
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