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P2538R1 ADL-proof std::projected #6349

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Jul 21, 2023
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P2538R1 ADL-proof std::projected #6349

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18 changes: 10 additions & 8 deletions source/iterators.tex
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Original file line number Diff line number Diff line change
Expand Up @@ -2512,16 +2512,18 @@
\indexlibraryglobal{projected}%
\begin{codeblock}
namespace std {
template<@\libconcept{indirectly_readable}@ I, @\libconcept{indirectly_regular_unary_invocable}@<I> Proj>
struct projected {
using value_type = remove_cvref_t<indirect_result_t<Proj&, I>>;
indirect_result_t<Proj&, I> operator*() const; // \notdef
template<class I, class Proj>
struct @\exposidnc{projected-impl}@ { // \expos
struct @\exposidnc{type}@ { // \expos
using value_type = remove_cvref_t<indirect_result_t<Proj&, I>>;
using difference_type = iter_difference_t<I>; // present only if \tcode{I}
// models \libconcept{weakly_incrementable}
indirect_result_t<Proj&, I> operator*() const; // \notdef
};
};

template<@\libconcept{weakly_incrementable}@ I, class Proj>
struct incrementable_traits<projected<I, Proj>> {
using difference_type = iter_difference_t<I>;
};
template<@\libconcept{indirectly_readable}@ I, @\libconcept{indirectly_regular_unary_invocable}@<I> Proj>
using projected = @\exposid{projected-impl}@<I, Proj>::@\exposid{type}@;
}
\end{codeblock}

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