From Jason Turner

[ios.base.general]

C++20 → C++23 4.7 KB 134 lines
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Archived: C++20 | C++23
Markdown: C++20 | C++23
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  1. tmp/tmpbopizujd/{from.md → to.md} +131 -0
tmp/tmpbopizujd/{from.md → to.md} RENAMED
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+ #### General <a id="ios.base.general">[[ios.base.general]]</a>
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+
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+ ``` cpp
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+ namespace std {
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+ class ios_base {
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+ public:
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+ class failure; // see below
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+
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+ // [ios.fmtflags], fmtflags
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+ using fmtflags = T1;
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+ static constexpr fmtflags boolalpha = unspecified;
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+ static constexpr fmtflags dec = unspecified;
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+ static constexpr fmtflags fixed = unspecified;
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+ static constexpr fmtflags hex = unspecified;
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+ static constexpr fmtflags internal = unspecified;
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+ static constexpr fmtflags left = unspecified;
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+ static constexpr fmtflags oct = unspecified;
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+ static constexpr fmtflags right = unspecified;
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+ static constexpr fmtflags scientific = unspecified;
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+ static constexpr fmtflags showbase = unspecified;
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+ static constexpr fmtflags showpoint = unspecified;
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+ static constexpr fmtflags showpos = unspecified;
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+ static constexpr fmtflags skipws = unspecified;
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+ static constexpr fmtflags unitbuf = unspecified;
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+ static constexpr fmtflags uppercase = unspecified;
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+ static constexpr fmtflags adjustfield = see below;
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+ static constexpr fmtflags basefield = see below;
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+ static constexpr fmtflags floatfield = see below;
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+
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+ // [ios.iostate], iostate
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+ using iostate = T2;
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+ static constexpr iostate badbit = unspecified;
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+ static constexpr iostate eofbit = unspecified;
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+ static constexpr iostate failbit = unspecified;
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+ static constexpr iostate goodbit = see below;
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+
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+ // [ios.openmode], openmode
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+ using openmode = T3;
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+ static constexpr openmode app = unspecified;
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+ static constexpr openmode ate = unspecified;
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+ static constexpr openmode binary = unspecified;
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+ static constexpr openmode in = unspecified;
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+ static constexpr openmode noreplace = unspecified;
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+ static constexpr openmode out = unspecified;
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+ static constexpr openmode trunc = unspecified;
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+
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+ // [ios.seekdir], seekdir
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+ using seekdir = T4;
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+ static constexpr seekdir beg = unspecified;
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+ static constexpr seekdir cur = unspecified;
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+ static constexpr seekdir end = unspecified;
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+
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+ class Init;
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+
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+ // [fmtflags.state], fmtflags state
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+ fmtflags flags() const;
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+ fmtflags flags(fmtflags fmtfl);
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+ fmtflags setf(fmtflags fmtfl);
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+ fmtflags setf(fmtflags fmtfl, fmtflags mask);
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+ void unsetf(fmtflags mask);
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+
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+ streamsize precision() const;
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+ streamsize precision(streamsize prec);
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+ streamsize width() const;
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+ streamsize width(streamsize wide);
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+
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+ // [ios.base.locales], locales
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+ locale imbue(const locale& loc);
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+ locale getloc() const;
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+
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+ // [ios.base.storage], storage
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+ static int xalloc();
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+ long& iword(int idx);
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+ void*& pword(int idx);
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+
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+ // destructor
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+ virtual ~ios_base();
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+
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+ // [ios.base.callback], callbacks
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+ enum event { erase_event, imbue_event, copyfmt_event };
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+ using event_callback = void (*)(event, ios_base&, int idx);
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+ void register_callback(event_callback fn, int idx);
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+
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+ ios_base(const ios_base&) = delete;
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+ ios_base& operator=(const ios_base&) = delete;
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+
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+ static bool sync_with_stdio(bool sync = true);
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+
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+ protected:
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+ ios_base();
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+
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+ private:
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+ static int index; // exposition only
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+ long* iarray; // exposition only
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+ void** parray; // exposition only
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+ };
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+ }
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+ ```
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+
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+ `ios_base`
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+
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+ defines several member types:
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+
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+ - a type `failure`, defined as either a class derived from
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+ `system_error` or a synonym for a class derived from `system_error`;
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+ - a class `Init`;
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+ - three bitmask types, `fmtflags`, `iostate`, and `openmode`;
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+ - an enumerated type, `seekdir`.
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+
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+ It maintains several kinds of data:
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+
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+ - state information that reflects the integrity of the stream buffer;
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+ - control information that influences how to interpret (format) input
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+ sequences and how to generate (format) output sequences;
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+ - additional information that is stored by the program for its private
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+ use.
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+
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+ [*Note 1*:
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+
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+ For the sake of exposition, the maintained data is presented here as:
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+
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+ - `static int index`, specifies the next available unique index for the
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+ integer or pointer arrays maintained for the private use of the
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+ program, initialized to an unspecified value;
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+ - `long* iarray`, points to the first element of an arbitrary-length
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+ `long` array maintained for the private use of the program;
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+ - `void** parray`, points to the first element of an arbitrary-length
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+ pointer array maintained for the private use of the program.
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+
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+ — *end note*]
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+