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.

Defined in header <ios>
boolalphanoboolalpha	switches between textual and numeric representation of booleans (function)
showbasenoshowbase	controls whether prefix is used to indicate numeric base (function)
showpointnoshowpoint	controls whether decimal point is always included in floating-point representation (function)
showposnoshowpos	controls whether the + sign used with non-negative numbers (function)
skipwsnoskipws	controls whether leading whitespace is skipped on input (function)
uppercasenouppercase	controls whether uppercase characters are used with some output formats (function)
unitbufnounitbuf	controls whether output is flushed after each operation (function)
internalleftright	sets the placement of fill characters (function)
dechexoct	changes the base used for integer I/O (function)
fixedscientifichexfloatdefaultfloat (C++11)(C++11)	changes formatting used for floating-point I/O (function)
Defined in header <istream>
ws	consumes whitespace (function template)
Defined in header <ostream>
ends	outputs '\0' (function template)
flush	flushes the output stream (function template)
endl	outputs '\n' and flushes the output stream (function template)
emit_on_flushnoemit_on_flush (C++20)	controls whether a stream's basic_syncbuf emits on flush (function template)
flush_emit (C++20)	flushes a stream and emits the content if it is using a basic_syncbuf (function template)
Defined in header <iomanip>
resetiosflags	clears the specified ios_base flags (function)
setiosflags	sets the specified ios_base flags (function)
setbase	changes the base used for integer I/O (function)
setfill	changes the fill character (function template)
setprecision	changes floating-point precision (function)
setw	changes the width of the next input/output field (function)
get_money (C++11)	parses a monetary value (function template)
put_money (C++11)	formats and outputs a monetary value (function template)
get_time (C++11)	parses a date/time value of specified format (function template)
put_time (C++11)	formats and outputs a date/time value according to the specified format (function template)
quoted (C++14)	inserts and extracts quoted strings with embedded spaces (function template)