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P3860R1 Proposed Resolution for NB Comment GB13-309 atomic_ref<T> is not convertible to atomic_ref<const T> #8519

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P3860R1 Proposed Resolution for NB Comment GB13-309 atomic_ref<T> is not convertible to atomic_ref<const T> #8519

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26 changes: 26 additions & 0 deletions source/threads.tex
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Original file line number Diff line number Diff line change
Expand Up @@ -3161,6 +3161,8 @@

constexpr explicit atomic_ref(T&);
constexpr atomic_ref(const atomic_ref&) noexcept;
template<class U>
constexpr atomic_ref(const atomic_ref<U>&) noexcept;
atomic_ref& operator=(const atomic_ref&) = delete;

constexpr void store(value_type, memory_order = memory_order::seq_cst) const noexcept;
Expand Down Expand Up @@ -3317,6 +3319,24 @@
\tcode{*this} references the object referenced by \tcode{ref}.
\end{itemdescr}

\begin{itemdecl}
template<class U>
constexpr atomic_ref(const atomic_ref<U>&) noexcept;
\end{itemdecl}

\begin{itemdescr}
\pnum
\constraints
\begin{itemize}
\item \tcode{T} and \tcode{U} are similar types\iref{conv.qual}, and
\item \tcode{is_convertible_v<U*, T*>} is \tcode{true}.
\end{itemize}

\pnum
\ensures
\tcode{*this} references the object referenced by \tcode{ref}.
\end{itemdescr}

\indexlibrarymember{store}{atomic_ref}%
\indexlibrarymember{store}{atomic_ref<\placeholder{pointer-type}>}%
\indexlibrarymember{store}{atomic_ref<\placeholder{integral-type}>}%
Expand Down Expand Up @@ -3642,6 +3662,8 @@

constexpr explicit atomic_ref(@\placeholder{integral-type}@&);
constexpr atomic_ref(const atomic_ref&) noexcept;
template<class U>
constexpr atomic_ref(const atomic_ref<U>&) noexcept;
atomic_ref& operator=(const atomic_ref&) = delete;

constexpr void store(value_type, memory_order = memory_order::seq_cst) const noexcept;
Expand Down Expand Up @@ -3860,6 +3882,8 @@

constexpr explicit atomic_ref(@\placeholder{floating-point-type}@&);
constexpr atomic_ref(const atomic_ref&) noexcept;
template<class U>
constexpr atomic_ref(const atomic_ref<U>&) noexcept;
atomic_ref& operator=(const atomic_ref&) = delete;

constexpr void store(value_type,
Expand Down Expand Up @@ -4148,6 +4172,8 @@

constexpr explicit atomic_ref(@\placeholder{pointer-type}@&);
constexpr atomic_ref(const atomic_ref&) noexcept;
template<class U>
constexpr atomic_ref(const atomic_ref<U>&) noexcept;
atomic_ref& operator=(const atomic_ref&) = delete;

constexpr void store(value_type, memory_order = memory_order::seq_cst) const noexcept;
Expand Down