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[expr]/12 optional conversion #1597

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brevzin opened this issue Apr 5, 2017 · 2 comments
Closed

[expr]/12 optional conversion #1597

brevzin opened this issue Apr 5, 2017 · 2 comments
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@jensmaurer

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@brevzin
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brevzin commented Apr 5, 2017

The wording currently reads:

If the expression is a prvalue after this optional conversion, the temporary materialization conversion is applied.

"this optional conversion" refers to the lvalue-to-rvalue conversion. Optional isn't a good word here, since the conversion itself is mandatory - just only conditionally applied. Maybe "If this conversion is applied and the resulting expression is a prvalue, the temporary materialization conversion is applied"? Or something along those lines.
@timsong-cpp
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The proposed rewording is incorrect. Materialization applies to all discarded prvalues, whether the prvalue is because the expression started off as a prvalue or because the lvalue-to-rvalue conversion was applied by the previous sentence to a volatile-qualified glvalue.

@brevzin
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brevzin commented Apr 6, 2017

"If the expression was a prvalue, or becomes a prvalue after applying the lvalue-to-rvalue conversion, the temporary materialization conversion is applied." ? "The temporary materialization conversion is applied if, after applying the lvalue-to-rvalue conversion if necessary, the expression is a prvalue."? "after conditionally applying the lvalue-to-rvalue conversion"?

jensmaurer added a commit to jensmaurer/draft that referenced this issue Jul 21, 2017
@jensmaurer
[expr] Use 'possibly converted' for discarded-value expression.
fdc591e 
Fixes cplusplus#1597.
@jensmaurer jensmaurer mentioned this issue Jul 21, 2017
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@jensmaurer jensmaurer self-assigned this Jul 21, 2017
zygoloid pushed a commit that referenced this issue Jul 30, 2017
@jensmaurer @zygoloid
[expr] Use 'possibly converted' for discarded-value expression.
9f16f5a 
Fixes #1597.
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