Input/output manipulators
Manipulators are helper functions that make it possible to control input/output streams using operator << or operator >> .
The manipulators that are invoked without arguments (e.g. std:: cout << std:: boolalpha ; or std:: cin >> std:: hex ; ) are implemented as functions that take a reference to a stream as their only argument. The special overloads of basic_ostream::operator<< and basic_istream::operator>> accept pointers to these functions. These functions (or instantiations of function templates) are the only addressable functions in the standard library. (since C++20)
The manipulators that are invoked with arguments (e.g.
std::
cout
<<
std::
setw
(
10
)
;
) are implemented as functions returning objects of unspecified type. These manipulators define their own
operator<<
or
operator>>
which perform the requested manipulation.
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Defined in header
<ios>
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switches between textual and numeric representation of booleans
(function) |
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controls whether prefix is used to indicate numeric base
(function) |
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controls whether decimal point is always included in floating-point representation
(function) |
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controls whether the
+
sign used with non-negative numbers
(function) |
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controls whether leading whitespace is skipped on input
(function) |
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controls whether uppercase characters are used with some output formats
(function) |
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controls whether output is flushed after each operation
(function) |
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sets the placement of fill characters
(function) |
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changes the base used for integer I/O
(function) |
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(C++11)
(C++11)
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changes formatting used for floating-point I/O
(function) |
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Defined in header
<istream>
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consumes whitespace
(function template) |
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Defined in header
<ostream>
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outputs
'
\0
'
(function template) |
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flushes the output stream
(function template) |
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outputs
'
\n
'
and flushes the output stream
(function template) |
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(C++20)
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controls whether a stream's
basic_syncbuf
emits on flush
(function template) |
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(C++20)
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flushes a stream and emits the content if it is using a
basic_syncbuf
(function template) |
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Defined in header
<iomanip>
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clears the specified ios_base flags
(function) |
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sets the specified
ios_base
flags
(function) |
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changes the base used for integer I/O
(function) |
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changes the fill character
(function template) |
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changes floating-point precision
(function) |
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changes the width of the next input/output field
(function) |
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(C++11)
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parses a monetary value
(function template) |
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(C++11)
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formats and outputs a monetary value
(function template) |
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(C++11)
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parses a date/time value of specified format
(function template) |
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(C++11)
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formats and outputs a date/time value according to the specified format
(function template) |
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(C++14)
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inserts and extracts quoted strings with embedded spaces
(function template) |