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[LWG motion 9 2024-06] P2968R2 Make std::ignore a first-class object #7109

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Jul 16, 2024
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[LWG motion 9 2024-06] P2968R2 Make std::ignore a first-class object #7109

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18 changes: 13 additions & 5 deletions source/utilities.tex
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Original file line number Diff line number Diff line change
Expand Up @@ -1494,6 +1494,11 @@
two arguments is similar to an instantiation of \tcode{pair} with the same two arguments.
See~\ref{pairs}.

\pnum
In addition to being available via inclusion of the \libheader{tuple} header,
\tcode{ignore}\iref{tuple.syn} is available when
\libheader{utility}\iref{utility} is included.

\rSec2[tuple.syn]{Header \tcode{<tuple>} synopsis}

\indexheader{tuple}%
Expand All @@ -1520,9 +1525,14 @@
template<@\exposconceptnc{tuple-like}@ TTuple, @\exposconceptnc{tuple-like}@ UTuple>
struct common_type<TTuple, UTuple>;

// \ref{tuple.creation}, tuple creation functions
inline constexpr @\unspec@ ignore;
// \tcode{ignore}
struct @\exposidnc{ignore-type}@ { // \expos
constexpr const @\exposid{ignore-type}@
operator=(const auto &) const noexcept { return *this; }
};
inline constexpr @\exposid{ignore-type}@ ignore;

// \ref{tuple.creation}, tuple creation functions
template<class... TTypes>
constexpr tuple<unwrap_ref_decay_t<TTypes>...> make_tuple(TTypes&&...);

Expand Down Expand Up @@ -2591,9 +2601,7 @@
\begin{itemdescr}
\pnum
\returns
\tcode{tuple<TTypes\&...>(t...)}. When an
argument in \tcode{t} is \tcode{ignore}, assigning
any value to the corresponding tuple element has no effect.
\tcode{tuple<TTypes\&...>(t...)}.

\pnum
\begin{example}
Expand Down