[2026-03 LWG Motion 17] P3978R3 constant_wrapper should unwrap on call and subscript#8884
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mattkretz wants to merge 1 commit intocplusplus:mainfrom
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[2026-03 LWG Motion 17] P3978R3 constant_wrapper should unwrap on call and subscript#8884mattkretz wants to merge 1 commit intocplusplus:mainfrom
mattkretz wants to merge 1 commit intocplusplus:mainfrom
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eisenwave
suggested changes
Mar 29, 2026
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| \pnum | ||
| \constraints | ||
| \placeholder{call-expr} is a valid expression. |
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| \placeholder{call-expr} is a valid expression. | |
| \tcode{\placeholder{call-expr}} is a valid expression. |
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| \pnum | ||
| \constraints | ||
| \placeholder{subscr-expr} is a valid expression. |
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| \placeholder{subscr-expr} is a valid expression. | |
| \tcode{\placeholder{subscr-expr}} is a valid expression. |
| The exception specification is equivalent to \tcode{noexcept(\placeholder{call-expr})}. | ||
| \end{itemdescr} | ||
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| \begin{itemdecl} |
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| \begin{itemdecl} | |
| \indexlibrarymember{operator[]}{constant_wrapper}% | |
| \begin{itemdecl} |
| Initialize elements of \exposid{data} with corresponding elements of \tcode{arr}. | ||
| \end{itemdescr} | ||
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| \begin{itemdecl} |
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| \begin{itemdecl} | |
| \indexlibrarymember{operator()}{constant_wrapper}% | |
| \begin{itemdecl} |
eisenwave
suggested changes
Mar 29, 2026
| \tcode{remove_cvref_t<Args>...} satisfy \exposconcept{constexpr-param} and | ||
| \tcode{constant_wrapper<\placeholder{INVOKE}(val\-ue, | ||
| remove_cvref_t<Args>::value...)>} is a valid type, otherwise let | ||
| \placeholder{call-expr} be \tcode{\placeholder{INVOKE}(value, |
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| \placeholder{call-expr} be \tcode{\placeholder{INVOKE}(value, | |
| \tcode{\placeholder{call-expr}} be \tcode{\placeholder{INVOKE}(value, |
| \tcode{constant_wrapper<value[remove_cvref_t<Args>::value...]>\{\}} if all | ||
| types in \tcode{remove_cvref_t<Args>...} satisfy \exposconcept{constexpr-param} | ||
| and \tcode{constant_wrapper<value[remove_cv\-ref_t<Args>::value...]>} is a valid | ||
| type, otherwise let \placeholder{subscr-expr} be |
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| type, otherwise let \placeholder{subscr-expr} be | |
| type, otherwise let \tcode{\placeholder{subscr-expr}} be |
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All applied except the move from
<type_traits>to<utility>. I'm not confident to do the latter. Feel free to reuse this commit even if it loses my authorship info.