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[2026-06 LWG Motion 19] P3785R1 Library Wording Changes for Defaulted Postfix Increment and Decrement Operations #9123

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[2026-06 LWG Motion 19] P3785R1 Library Wording Changes for Defaulted Postfix Increment and Decrement Operations #9123

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141 changes: 14 additions & 127 deletions source/iterators.tex
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Original file line number Diff line number Diff line change
Expand Up @@ -4289,10 +4289,10 @@

constexpr basic_const_iterator& operator++();
constexpr void operator++(int);
constexpr basic_const_iterator operator++(int) requires @\libconcept{forward_iterator}@<Iterator>;
basic_const_iterator operator++(int) requires @\libconcept{forward_iterator}@<Iterator> = default;

constexpr basic_const_iterator& operator--() requires @\libconcept{bidirectional_iterator}@<Iterator>;
constexpr basic_const_iterator operator--(int) requires @\libconcept{bidirectional_iterator}@<Iterator>;
basic_const_iterator operator--(int) requires @\libconcept{bidirectional_iterator}@<Iterator> = default;

constexpr basic_const_iterator& operator+=(difference_type n)
requires @\libconcept{random_access_iterator}@<Iterator>;
Expand Down Expand Up @@ -4522,22 +4522,6 @@
Equivalent to: \tcode{++\exposid{current_};}
\end{itemdescr}

\indexlibrarymember{operator++}{basic_const_iterator}%
\begin{itemdecl}
constexpr basic_const_iterator operator++(int) requires @\libconcept{forward_iterator}@<Iterator>;
\end{itemdecl}

\begin{itemdescr}
\pnum
\effects
Equivalent to:
\begin{codeblock}
auto tmp = *this;
++*this;
return tmp;
\end{codeblock}
\end{itemdescr}

\indexlibrarymember{operator--}{basic_const_iterator}%
\begin{itemdecl}
constexpr basic_const_iterator& operator--() requires @\libconcept{bidirectional_iterator}@<Iterator>;
Expand All @@ -4553,22 +4537,6 @@
\end{codeblock}
\end{itemdescr}

\indexlibrarymember{operator--}{basic_const_iterator}%
\begin{itemdecl}
constexpr basic_const_iterator operator--(int) requires @\libconcept{bidirectional_iterator}@<Iterator>;
\end{itemdecl}

\begin{itemdescr}
\pnum
\effects
Equivalent to:
\begin{codeblock}
auto tmp = *this;
--*this;
return tmp;
\end{codeblock}
\end{itemdescr}

\indexlibrarymember{operator+=}{basic_const_iterator}%
\indexlibrarymember{operator-=}{basic_const_iterator}%
\begin{itemdecl}
Expand Down Expand Up @@ -4828,9 +4796,10 @@
constexpr reference operator*() const;

constexpr move_iterator& operator++();
constexpr auto operator++(int);
constexpr void operator++(int);
move_iterator operator++(int) requires @\libconcept{forward_iterator}@<Iterator> = default;
constexpr move_iterator& operator--();
constexpr move_iterator operator--(int);
move_iterator operator--(int) = default;

constexpr move_iterator operator+(difference_type n) const;
constexpr move_iterator& operator+=(difference_type n);
Expand Down Expand Up @@ -5041,19 +5010,13 @@

\indexlibrarymember{operator++}{move_iterator}%
\begin{itemdecl}
constexpr auto operator++(int);
constexpr void operator++(int);
\end{itemdecl}

\begin{itemdescr}
\pnum
\effects
If \tcode{Iterator} models \libconcept{forward_iterator}, equivalent to:
\begin{codeblock}
move_iterator tmp = *this;
++current;
return tmp;
\end{codeblock}
Otherwise, equivalent to \tcode{++current}.
Equivalent to \tcode{++current}.
\end{itemdescr}

\indexlibrarymember{operator--}{move_iterator}%
Expand All @@ -5071,22 +5034,6 @@
\tcode{*this}.
\end{itemdescr}

\indexlibrarymember{operator--}{move_iterator}%
\begin{itemdecl}
constexpr move_iterator operator--(int);
\end{itemdecl}

\begin{itemdescr}
\pnum
\effects
As if by:
\begin{codeblock}
move_iterator tmp = *this;
--current;
return tmp;
\end{codeblock}
\end{itemdescr}

\indexlibrarymember{operator+}{move_iterator}%
\begin{itemdecl}
constexpr move_iterator operator+(difference_type n) const;
Expand Down Expand Up @@ -5491,6 +5438,7 @@

constexpr common_iterator& operator++();
constexpr decltype(auto) operator++(int);
common_iterator operator++(int) requires @\libconcept{forward_iterator}@<I> = default;

template<class I2, @\libconcept{sentinel_for}@<I> S2>
requires @\libconcept{sentinel_for}@<S, I2>
Expand Down Expand Up @@ -5741,14 +5689,7 @@

\pnum
\effects
If \tcode{I} models \libconcept{forward_iterator}, equivalent to:
\begin{codeblock}
common_iterator tmp = *this;
++*this;
return tmp;
\end{codeblock}
Otherwise, if
\tcode{requires(I\& i) \{ \{ *i++ \} -> \exposconceptnc{can-reference}; \}}
If \tcode{requires(I\& i) \{ \{ *i++ \} -> \exposconceptnc{can-reference}; \}}
is \tcode{true} or
\begin{codeblock}
@\libconcept{indirectly_readable}@<I> && @\libconcept{constructible_from}@<iter_value_t<I>, iter_reference_t<I>> &&
Expand Down Expand Up @@ -5967,12 +5908,12 @@

constexpr counted_iterator& operator++();
constexpr decltype(auto) operator++(int);
constexpr counted_iterator operator++(int)
requires @\libconcept{forward_iterator}@<I>;
counted_iterator operator++(int)
requires @\libconcept{forward_iterator}@<I> = default;
constexpr counted_iterator& operator--()
requires @\libconcept{bidirectional_iterator}@<I>;
constexpr counted_iterator operator--(int)
requires @\libconcept{bidirectional_iterator}@<I>;
counted_iterator operator--(int)
requires @\libconcept{bidirectional_iterator}@<I> = default;

constexpr counted_iterator operator+(iter_difference_t<I> n) const
requires @\libconcept{random_access_iterator}@<I>;
Expand Down Expand Up @@ -6202,23 +6143,6 @@
\end{codeblock}
\end{itemdescr}

\indexlibrarymember{operator++}{counted_iterator}%
\begin{itemdecl}
constexpr counted_iterator operator++(int)
requires @\libconcept{forward_iterator}@<I>;
\end{itemdecl}

\begin{itemdescr}
\pnum
\effects
Equivalent to:
\begin{codeblock}
counted_iterator tmp = *this;
++*this;
return tmp;
\end{codeblock}
\end{itemdescr}

\indexlibrarymember{operator--}{counted_iterator}%
\begin{itemdecl}
constexpr counted_iterator& operator--()
Expand All @@ -6236,23 +6160,6 @@
\end{codeblock}
\end{itemdescr}

\indexlibrarymember{operator--}{counted_iterator}%
\begin{itemdecl}
constexpr counted_iterator operator--(int)
requires @\libconcept{bidirectional_iterator}@<I>;
\end{itemdecl}

\begin{itemdescr}
\pnum
\effects
Equivalent to:
\begin{codeblock}
counted_iterator tmp = *this;
--*this;
return tmp;
\end{codeblock}
\end{itemdescr}

\indexlibrarymember{operator+}{counted_iterator}%
\begin{itemdecl}
constexpr counted_iterator operator+(iter_difference_t<I> n) const
Expand Down Expand Up @@ -6560,7 +6467,7 @@
const T& operator*() const;
const T* operator->() const;
istream_iterator& operator++();
istream_iterator operator++(int);
istream_iterator operator++(int) = default;

friend bool operator==(const istream_iterator& i, default_sentinel_t);

Expand Down Expand Up @@ -6701,26 +6608,6 @@
\tcode{*this}.
\end{itemdescr}

\indexlibrarymember{operator++}{istream_iterator}%
\begin{itemdecl}
istream_iterator operator++(int);
\end{itemdecl}

\begin{itemdescr}
\pnum
\expects
\tcode{in_stream != nullptr} is \tcode{true}.

\pnum
\effects
Equivalent to:
\begin{codeblock}
istream_iterator tmp = *this;
++*this;
return tmp;
\end{codeblock}
\end{itemdescr}

\indexlibrarymember{operator==}{istream_iterator}%
\begin{itemdecl}
template<class T, class charT, class traits, class Distance>
Expand Down
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