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P0602R4 variant and optional should propagate copy/move triviality #2458

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Nov 26, 2018
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P0602R4 variant and optional should propagate copy/move triviality #2458

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51 changes: 36 additions & 15 deletions source/utilities.tex
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Original file line number Diff line number Diff line change
Expand Up @@ -2224,8 +2224,8 @@

// \ref{optional.assign}, assignment
optional& operator=(nullopt_t) noexcept;
optional& operator=(const optional&);
optional& operator=(optional&&) noexcept(@\seebelow@);
constexpr optional& operator=(const optional&);
constexpr optional& operator=(optional&&) noexcept(@\seebelow@);
template<class U = T> optional& operator=(U&&);
template<class U> optional& operator=(const optional<U>&);
template<class U> optional& operator=(optional<U>&&);
Expand Down Expand Up @@ -2325,7 +2325,7 @@
This constructor shall be defined as deleted unless
\tcode{is_copy_constructible_v<T>} is \tcode{true}.
If \tcode{is_trivially_copy_constructible_v<T>} is \tcode{true},
this constructor shall be a \tcode{constexpr} constructor.
this constructor is trivial..
\end{itemdescr}

\indexlibrary{\idxcode{optional}!constructor}%
Expand Down Expand Up @@ -2355,7 +2355,7 @@
This constructor shall not participate in overload resolution
unless \tcode{is_move_constructible_v<T>} is \tcode{true}.
If \tcode{is_trivially_move_constructible_v<T>} is \tcode{true},
this constructor shall be a \tcode{constexpr} constructor.
this constructor is trivial.
\end{itemdescr}

\indexlibrary{\idxcode{optional}!constructor}%
Expand Down Expand Up @@ -2565,7 +2565,7 @@

\indexlibrarymember{operator=}{optional}%
\begin{itemdecl}
optional<T>& operator=(const optional& rhs);
constexpr optional<T>& operator=(const optional& rhs);
\end{itemdecl}

\begin{itemdescr}
Expand Down Expand Up @@ -2603,11 +2603,15 @@
This operator shall be defined as deleted unless
\tcode{is_copy_constructible_v<T>} is \tcode{true} and
\tcode{is_copy_assignable_v<T>} is \tcode{true}.
If \tcode{is_trivially_copy_constructible_v<T> \&\&}
\tcode{is_trivially_copy_assignable_v<T> \&\&}
\tcode{is_trivially_destructible_v<T>} is \tcode{true},
this assignment operator is trivial.
\end{itemdescr}

\indexlibrarymember{operator=}{optional}%
\begin{itemdecl}
optional<T>& operator=(optional&& rhs) noexcept(@\seebelow@);
constexpr optional<T>& operator=(optional&& rhs) noexcept(@\seebelow@);
\end{itemdecl}

\begin{itemdescr}
Expand Down Expand Up @@ -2653,6 +2657,10 @@
This operator shall not participate in overload resolution unless
\tcode{is_move_constructible_v<T>} is \tcode{true} and
\tcode{is_move_assignable_v<T>} is \tcode{true}.
If \tcode{is_trivially_move_constructible_v<T> \&\&}
\tcode{is_trivially_move_assignable_v<T> \&\&}
\tcode{is_trivially_destructible_v<T>} is \tcode{true},
this assignment operator is trivial.
\end{itemdescr}

\indexlibrarymember{operator=}{optional}%
Expand Down Expand Up @@ -3803,8 +3811,8 @@
public:
// \ref{variant.ctor}, constructors
constexpr variant() noexcept(@\seebelow@);
variant(const variant&);
variant(variant&&) noexcept(@\seebelow@);
constexpr variant(const variant&);
constexpr variant(variant&&) noexcept(@\seebelow@);

template<class T>
constexpr variant(T&&) noexcept(@\seebelow@);
Expand All @@ -3823,8 +3831,8 @@
~variant();

// \ref{variant.assign}, assignment
variant& operator=(const variant&);
variant& operator=(variant&&) noexcept(@\seebelow@);
constexpr variant& operator=(const variant&);
constexpr variant& operator=(variant&&) noexcept(@\seebelow@);

template<class T> variant& operator=(T&&) noexcept(@\seebelow@);

Expand Down Expand Up @@ -3908,7 +3916,7 @@

\indexlibrary{\idxcode{variant}!constructor}%
\begin{itemdecl}
variant(const variant& w);
constexpr variant(const variant& w);
\end{itemdecl}

\begin{itemdescr}
Expand All @@ -3927,11 +3935,13 @@
\remarks
This constructor shall be defined as deleted unless
\tcode{is_copy_constructible_v<$\tcode{T}_i$>} is \tcode{true} for all $i$.
If \tcode{is_trivially_copy_constructible_v<$\tcode{T}_i$>}
is \tcode{true} for all $i$, this constructor is trivial.
\end{itemdescr}

\indexlibrary{\idxcode{variant}!constructor}%
\begin{itemdecl}
variant(variant&& w) noexcept(@\seebelow@);
constexpr variant(variant&& w) noexcept(@\seebelow@);
\end{itemdecl}

\begin{itemdescr}
Expand All @@ -3952,6 +3962,8 @@
\tcode{is_nothrow_move_constructible_v<$\tcode{T}_i$>} for all $i$.
This function shall not participate in overload resolution unless
\tcode{is_move_constructible_v<$\tcode{T}_i$>} is \tcode{true} for all $i$.
If \tcode{is_trivially_move_constructible_v<$\tcode{T}_i$>}
is \tcode{true} for all $i$, this constructor is trivial.
\end{itemdescr}

\indexlibrary{\idxcode{variant}!constructor}%
Expand Down Expand Up @@ -4165,7 +4177,7 @@

\indexlibrarymember{operator=}{variant}%
\begin{itemdecl}
variant& operator=(const variant& rhs);
constexpr variant& operator=(const variant& rhs);
\end{itemdecl}

\begin{itemdescr}
Expand Down Expand Up @@ -4204,11 +4216,15 @@
\tcode{is_copy_constructible_v<$\tcode{T}_i$> \&\&}
\tcode{is_copy_assignable_v<$\tcode{T}_i$>}
is \tcode{true} for all $i$.
If \tcode{is_trivially_copy_constructible_v<$\tcode{T}_i$> \&\&}
\tcode{is_trivially_copy_assignable_v<$\tcode{T}_i$> \&\&}
\tcode{is_trivially_destructible_v<$\tcode{T}_i$>}
is true for all $i$, this assignment operator is trivial.
\end{itemdescr}

\indexlibrarymember{operator=}{variant}%
\begin{itemdecl}
variant& operator=(variant&& rhs) noexcept(@\seebelow@);
constexpr variant& operator=(variant&& rhs) noexcept(@\seebelow@);
\end{itemdecl}

\begin{itemdescr}
Expand Down Expand Up @@ -4236,8 +4252,13 @@
\pnum
\remarks
This function shall not participate in overload resolution unless
\tcode{is_move_constructible_v<$\tcode{T}_i$> \&\& is_move_assignable_v<$\tcode{T}_i$>} is
\tcode{is_move_constructible_v<$\tcode{T}_i$> \&\&}
\tcode{is_move_assignable_v<$\tcode{T}_i$>} is
\tcode{true} for all $i$.
If \tcode{is_trivially_move_constructible_v<$\tcode{T}_i$> \&\&}
\tcode{is_trivially_move_assignable_v<$\tcode{T}_i$> \&\&}
\tcode{is_trivially_destructible_v<$\tcode{T}_i$>}
is true for all $i$, this assignment operator is trivial.
The expression inside \tcode{noexcept} is equivalent to:
\tcode{is_nothrow_move_constructible_v<$\tcode{T}_i$> \&\& is_nothrow_move_assignable_v<$\tcode{T}_i$>} for all $i$.
\begin{itemize}
Expand Down