30 Input/output library [input.output]

30.5 Iostreams base classes [iostreams.base]

30.5.6 ios_­base manipulators [std.ios.manip]

30.5.6.1 fmtflags manipulators [fmtflags.manip]

ios_base& boolalpha(ios_base& str);
1
#
Effects: Calls str.setf(ios_­base​::​boolalpha).
2
#
Returns: str.
ios_base& noboolalpha(ios_base& str);
3
#
Effects: Calls str.unsetf(ios_­base​::​boolalpha).
4
#
Returns: str.
ios_base& showbase(ios_base& str);
5
#
Effects: Calls str.setf(ios_­base​::​showbase).
6
#
Returns: str.
ios_base& noshowbase(ios_base& str);
7
#
Effects: Calls str.unsetf(ios_­base​::​showbase).
8
#
Returns: str.
ios_base& showpoint(ios_base& str);
9
#
Effects: Calls str.setf(ios_­base​::​showpoint).
10
#
Returns: str.
ios_base& noshowpoint(ios_base& str);
11
#
Effects: Calls str.unsetf(ios_­base​::​showpoint).
12
#
Returns: str.
ios_base& showpos(ios_base& str);
13
#
Effects: Calls str.setf(ios_­base​::​showpos).
14
#
Returns: str.
ios_base& noshowpos(ios_base& str);
15
#
Effects: Calls str.unsetf(ios_­base​::​showpos).
16
#
Returns: str.
ios_base& skipws(ios_base& str);
17
#
Effects: Calls str.setf(ios_­base​::​skipws).
18
#
Returns: str.
ios_base& noskipws(ios_base& str);
19
#
Effects: Calls str.unsetf(ios_­base​::​skipws).
20
#
Returns: str.
ios_base& uppercase(ios_base& str);
21
#
Effects: Calls str.setf(ios_­base​::​uppercase).
22
#
Returns: str.
ios_base& nouppercase(ios_base& str);
23
#
Effects: Calls str.unsetf(ios_­base​::​uppercase).
24
#
Returns: str.
ios_base& unitbuf(ios_base& str);
25
#
Effects: Calls str.setf(ios_­base​::​unitbuf).
26
#
Returns: str.
ios_base& nounitbuf(ios_base& str);
27
#
Effects: Calls str.unsetf(ios_­base​::​unitbuf).
28
#
Returns: str.

30.5.6.2 adjustfield manipulators [adjustfield.manip]

ios_base& internal(ios_base& str);
1
#
Effects: Calls str.setf(ios_­base​::​internal, ios_­base​::​adjustfield).
2
#
Returns: str.
ios_base& left(ios_base& str);
3
#
Effects: Calls str.setf(ios_­base​::​left, ios_­base​::​adjustfield).
4
#
Returns: str.
ios_base& right(ios_base& str);
5
#
Effects: Calls str.setf(ios_­base​::​right, ios_­base​::​adjustfield).
6
#
Returns: str.

30.5.6.3 basefield manipulators [basefield.manip]

ios_base& dec(ios_base& str);
1
#
Effects: Calls str.setf(ios_­base​::​dec, ios_­base​::​basefield).
2
#
Returns: str298.
ios_base& hex(ios_base& str);
3
#
Effects: Calls str.setf(ios_­base​::​hex, ios_­base​::​basefield).
4
#
Returns: str.
ios_base& oct(ios_base& str);
5
#
Effects: Calls str.setf(ios_­base​::​oct, ios_­base​::​basefield).
6
#
Returns: str.
298)
The function signature dec(ios_­base&) can be called by the function signature basic_­ostream& stream​::​operator<<(ios_­base& (*)(ios_­base&)) to permit expressions of the form cout << dec to change the format flags stored in cout.

30.5.6.4 floatfield manipulators [floatfield.manip]

ios_base& fixed(ios_base& str);
1
#
Effects: Calls str.setf(ios_­base​::​fixed, ios_­base​::​floatfield).
2
#
Returns: str.
ios_base& scientific(ios_base& str);
3
#
Effects: Calls str.setf(ios_­base​::​scientific, ios_­base​::​floatfield).
4
#
Returns: str.
ios_base& hexfloat(ios_base& str);
5
#
Effects: Calls str.setf(ios_­base​::​fixed | ios_­base​::​scientific, ios_­base​::​floatfield).
6
#
Returns: str.
7
#
[ Note
:
The more obvious use of ios_­base​::​hex to specify hexadecimal floating-point format would change the meaning of existing well defined programs.
C++ 2003 gives no meaning to the combination of fixed and scientific.
— end note
 ]
ios_base& defaultfloat(ios_base& str);
8
#
Effects: Calls str.unsetf(ios_­base​::​floatfield).
9
#
Returns: str.

30.5.6.5 Error reporting [error.reporting]

error_code make_error_code(io_errc e) noexcept;
1
#
Returns: error_­code(static_­cast<int>(e), iostream_­category()).
error_condition make_error_condition(io_errc e) noexcept;
2
#
Returns: error_­condition(static_­cast<int>(e), iostream_­category()).
const error_category& iostream_category() noexcept;
3
#
Returns: A reference to an object of a type derived from class error_­category.
4
#
The object's default_­error_­condition and equivalent virtual functions shall behave as specified for the class error_­category.
The object's name virtual function shall return a pointer to the string "iostream".