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[2026-03 LWG Motion 19] P3981R2 Better return types in std::inplace_vector and std::exception_ptr_cast #8898

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[2026-03 LWG Motion 19] P3981R2 Better return types in std::inplace_vector and std::exception_ptr_cast #8898

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16 changes: 8 additions & 8 deletions source/containers.tex
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Original file line number Diff line number Diff line change
Expand Up @@ -10953,9 +10953,9 @@
constexpr void pop_back();

template<class... Args>
constexpr pointer try_emplace_back(Args&&... args);
constexpr pointer try_push_back(const T& x);
constexpr pointer try_push_back(T&& x);
constexpr optional<reference> try_emplace_back(Args&&... args);
constexpr optional<reference> try_push_back(const T& x);
constexpr optional<reference> try_push_back(T&& x);
template<@\exposconcept{container-compatible-range}@<T> R>
constexpr ranges::borrowed_iterator_t<R> try_append_range(R&& rg);

Expand Down Expand Up @@ -11262,9 +11262,9 @@
\indexlibrarymember{try_push_back}{inplace_vector}%
\begin{itemdecl}
template<class... Args>
constexpr pointer try_emplace_back(Args&&... args);
constexpr pointer try_push_back(const T& x);
constexpr pointer try_push_back(T&& x);
constexpr optional<reference> try_emplace_back(Args&&... args);
constexpr optional<reference> try_push_back(const T& x);
constexpr optional<reference> try_push_back(T&& x);
\end{itemdecl}

\begin{itemdescr}
Expand All @@ -11290,8 +11290,8 @@

\pnum
\returns
\keyword{nullptr} if \tcode{size() == capacity()} is \tcode{true},
otherwise \tcode{addressof(back())}.
\keyword{nullopt} if \tcode{size() == capacity()} is \tcode{true},
otherwise \tcode{optional<reference>(in_place, back())}.

\pnum
\throws
Expand Down
15 changes: 9 additions & 6 deletions source/support.tex
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Original file line number Diff line number Diff line change
Expand Up @@ -671,7 +671,7 @@
#define @\defnlibxname{cpp_lib_erase_if}@ 202002L
// also in \libheader{string}, \libheader{deque}, \libheader{forward_list}, \libheader{list}, \libheader{vector}, \libheader{map}, \libheader{set}, \libheader{unordered_map},
// \libheader{unordered_set}
#define @\defnlibxname{cpp_lib_exception_ptr_cast}@ 202506L // also in \libheader{exception}
#define @\defnlibxname{cpp_lib_exception_ptr_cast}@ 202603L // also in \libheader{exception}
#define @\defnlibxname{cpp_lib_exchange_function}@ 201304L // freestanding, also in \libheader{utility}
#define @\defnlibxname{cpp_lib_execution}@ 201902L // also in \libheader{execution}
#define @\defnlibxname{cpp_lib_expected}@ 202211L // also in \libheader{expected}
Expand Down Expand Up @@ -727,7 +727,7 @@
#define @\defnlibxname{cpp_lib_indirect}@ 202502L // also in \libheader{memory}
#define @\defnlibxname{cpp_lib_initializer_list}@ 202511L
// freestanding, also in \libheader{initializer_list}
#define @\defnlibxname{cpp_lib_inplace_vector}@ 202406L // also in \libheader{inplace_vector}
#define @\defnlibxname{cpp_lib_inplace_vector}@ 202603L // also in \libheader{inplace_vector}
#define @\defnlibxname{cpp_lib_int_pow2}@ 202002L // freestanding, also in \libheader{bit}
#define @\defnlibxname{cpp_lib_integer_comparison_functions}@ 202002L // freestanding, also in \libheader{utility}
#define @\defnlibxname{cpp_lib_integer_sequence}@ 202511L // freestanding, also in \libheader{utility}
Expand Down Expand Up @@ -3844,7 +3844,8 @@
constexpr exception_ptr current_exception() noexcept;
[[noreturn]] constexpr void rethrow_exception(exception_ptr p);
template<class E> constexpr exception_ptr make_exception_ptr(E e) noexcept;
template<class E> constexpr const E* exception_ptr_cast(const exception_ptr& p) noexcept;
template<class E>
constexpr optional<const E&> exception_ptr_cast(const exception_ptr& p) noexcept;
template<class E> void exception_ptr_cast(const exception_ptr&&) = delete;

template<class T> [[noreturn]] constexpr void throw_with_nested(T&& t);
Expand Down Expand Up @@ -4225,7 +4226,8 @@

\indexlibraryglobal{exception_ptr_cast}%
\begin{itemdecl}
template<class E> constexpr const E* exception_ptr_cast(const exception_ptr& p) noexcept;
template<class E>
constexpr optional<const E&> exception_ptr_cast(const exception_ptr& p) noexcept;
\end{itemdecl}

\begin{itemdescr}
Expand All @@ -4242,11 +4244,12 @@

\pnum
\returns
A pointer to the exception object referred to by \tcode{p},
An \tcode{optional} containing a reference
to the exception object referred to by \tcode{p},
if \tcode{p} is not null and
a handler of type \tcode{const E\&}
would be a match\iref{except.handle} for that exception object.
Otherwise, \tcode{nullptr}.
Otherwise, \tcode{nullopt}.
\end{itemdescr}

\rSec2[except.nested]{\tcode{nested_exception}}
Expand Down
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