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[expr.ref]/2 #2051

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jabelloc opened this issue Apr 26, 2018 · 2 comments
Closed

[expr.ref]/2 #2051

jabelloc opened this issue Apr 26, 2018 · 2 comments

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@jabelloc
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[expr.ref]/2

For the first option (dot) the first expression shall be a glvalue having class type. . . .

We should replace the "glvalue having class type" above by "glvalue or prvalue having class type", otherwise the snippet below would be invalid.

struct A{ int a; };
int&& r = A().a;
@tkoeppe
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tkoeppe commented Apr 26, 2018

No, prvalues aren't materialized objects. We really do want a glvalue here, and that will necessitate materialization [conv.rval].

@tkoeppe tkoeppe closed this as completed Apr 26, 2018
@jabelloc
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jabelloc commented Apr 26, 2018 •
edited

No, prvalues aren't materialized objects. We really do want a glvalue here, and that will necessitate materialization [conv.rval].

That doesn't make any sense to me It would be much easier to understand what you said with something like this: For the first option (dot) the compiler requires a glvalue. But it will implicitly convert a prvalue into an xvalue by [conv.rval].

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@tkoeppe @jabelloc