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>>
Defined in header
<ios> | |
| 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)
|
changes formatting used for floating-point I/O (function) |
Defined in header
<istream> | |
| consumes whitespace (function template) |
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Defined in header
<ostream> | |
| 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) |
Defined in header
<iomanip> | |
| 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)
|
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) |