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P3778R0 Fix for type_order template definition #8513

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P3778R0 Fix for type_order template definition #8513

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c4c6adc
P3778R0 Fix for type_order template definition
jwakely Nov 12, 2025
0f54abb
Index members of type_order
jwakely Nov 13, 2025
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15 changes: 8 additions & 7 deletions source/support.tex
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Original file line number Diff line number Diff line change
Expand Up @@ -5738,16 +5738,17 @@

\indexlibraryglobal{type_order}%
\begin{itemdecl}
template<class T, class U>
struct type_order;
template<class T, class U> struct type_order {
static constexpr strong_ordering value = @\exposid{TYPE-ORDER}@(T, U);

using value_type = strong_ordering;

constexpr operator value_type() const noexcept { return value; }
constexpr value_type operator()() const noexcept { return value; }
};
\end{itemdecl}

\begin{itemdescr}
\pnum
The name \tcode{type_order} denotes a \oldconcept{BinaryTypeTrait}\iref{meta.rqmts}
with a base characteristic of
\tcode{inte\-gral_constant<strong_ordering, \exposid{TYPE-ORDER}(T, U)>}.

\pnum
\recommended
The order should be lexicographical on parameter-type-lists and template argument lists.
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