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Nov 26, 2018
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P1148R0 Cleaning up Clause 20 #2496

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dbf1bd4
P1148R0 Cleaning up Clause 20
zygoloid Nov 26, 2018
d9521a9
[iostream.forward.overview] Convert incomplete wording with no normative
zygoloid Nov 26, 2018
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41 changes: 24 additions & 17 deletions source/iostreams.tex
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Original file line number Diff line number Diff line change
Expand Up @@ -162,6 +162,11 @@
\indexlibrary{\idxcode{wsyncbuf}}%
\indexlibrary{\idxcode{osyncstream}}%
\indexlibrary{\idxcode{wosyncstream}}%
\indexlibrary{\idxcode{fpos}}%
\indexlibrary{\idxcode{streampos}}%
\indexlibrary{\idxcode{wstreampos}}%
\indexlibrary{\idxcode{u16streampos}}%
\indexlibrary{\idxcode{u32streampos}}%
\begin{codeblock}
namespace std {
template<class charT> class char_traits;
Expand Down Expand Up @@ -261,6 +266,8 @@
using streampos = fpos<char_traits<char>::state_type>;
using wstreampos = fpos<char_traits<wchar_t>::state_type>;
using u8streampos = fpos<char_traits<char8_t>::state_type>;
using u16streampos = fpos<char_traits<char16_t>::state_type>;
using u32streampos = fpos<char_traits<char32_t>::state_type>;
}
\end{codeblock}

Expand Down Expand Up @@ -303,9 +310,10 @@
class template specialization
\tcode{basic_streambuf<charT, traits>}
serves as a base class for class templates
\tcode{basic_stringbuf}
\tcode{basic_stringbuf},
\tcode{basic_filebuf},
and
\tcode{basic_filebuf}.
\tcode{basic_syncbuf}.

\pnum
The
Expand All @@ -321,9 +329,10 @@
class template specialization
\tcode{basic_ostream<charT, traits>}
serves as a base class for class templates
\tcode{basic_ostringstream}
\tcode{basic_ostringstream},
\tcode{basic_ofstream},
and
\tcode{basic_ofstream}.
\tcode{basic_osyncstream}.

\pnum
The
Expand All @@ -334,6 +343,15 @@
and
\tcode{basic_fstream}.

\pnum
\begin{note}
For each of the class templates above,
the program is ill-formed if
\tcode{traits::char_type}
is not the same type as
\tcode{charT}\iref{char.traits}.
\end{note}

\pnum
Other \grammarterm{typedef-name}{s} define instances of
class templates
Expand All @@ -348,8 +366,7 @@
\tcode{fpos}
are
used for specifying file position information.

\pnum
\begin{example}
The types
\tcode{streampos}
and
Expand All @@ -359,6 +376,7 @@
and
\tcode{wchar_t}
respectively.
\end{example}

\pnum
\begin{note}
Expand All @@ -368,17 +386,6 @@
\tcode{char_traits<char>}.
An implementation can avoid this circularity by substituting equivalent
types.
One way to do this might be
\begin{codeblock}
template<class stateT> class fpos { @\commentellip@ }; // depends on nothing
using _STATE = @\commentellip@ ; // implementation private declaration of \tcode{stateT}

using streampos = fpos<_STATE>;

template<> struct char_traits<char> {
using pos_type = streampos;
}
\end{codeblock}
\end{note}

\rSec1[iostream.objects]{Standard iostream objects}
Expand Down
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