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[expr.sizeof][expr.alignof][expr.unary.noexcept] What is a constant? #2671

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Rakete1111 opened this issue Feb 17, 2019 · 2 comments · Fixed by #2902
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[expr.sizeof][expr.alignof][expr.unary.noexcept] What is a constant? #2671

Rakete1111 opened this issue Feb 17, 2019 · 2 comments · Fixed by #2902
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@jensmaurer

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@Rakete1111
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[expr.sizeof]p6:

The result of sizeof and sizeof... is a constant of type std::size_­t.

[expr.alignof]p2:

The result is an integral constant of type std::size_­t.

[expr.unary.noexcept]p2:

The result of the noexcept operator is a constant of type bool and is a prvalue.

I can't find a definition of constant anywhere. It seems like it is supposed to mean an integral constant expression.

Also the first two miss saying what the value category of the result is.
@languagelawyer
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Lotsa operators miss requirements for value category of operands and don't specify value category of the resulting expression. It was noticed long time ago https://groups.google.com/a/isocpp.org/d/msg/std-discussion/sjK_KoeD3xo/a55uY-Q4q5kJ

@jensmaurer jensmaurer mentioned this issue May 28, 2019
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@jensmaurer jensmaurer self-assigned this May 28, 2019
@jensmaurer
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Let's fix these three situations as a first step.

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[expr.sizeof,expr.alignof,expr.unary.noexcept] Clarify value category. jensmaurer/draft
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@Rakete1111 @jensmaurer @languagelawyer