std::basic_ostream

Defined in header <ostream>
template < class CharT, class Traits = std::char_traits <CharT> > class basic_ostream : virtual public std::basic_ios <CharT, Traits>

The class template basic_ostream basic_streambuf class, accessed through the basic_ios base class. In typical implementations, basic_ostream

Several typedefs for common character types are provided:

Defined in header <ostream>
Type	Definition
std::ostream	std::basic_ostream<char>
std::wostream	std::basic_ostream<wchar_t>

Global objects

Six global basic_ostream objects are provided by the standard library:

Defined in header <iostream>
coutwcout	writes to the standard C output stream stdout (global object)
cerrwcerr	writes to the standard C error stream stderr, unbuffered (global object)
clogwclog	writes to the standard C error stream stderr (global object)

Member types

Member type	Definition
char_type	CharT
traits_type	Traits; the program is ill-formed if Traits::char_type is not CharT.
int_type	Traits::int_type
pos_type	Traits::pos_type
off_type	Traits::off_type

Member functions

(constructor)	constructs the object (public member function)
(destructor) [virtual]	destructs the object (virtual public member function)
operator= (C++11)	move-assigns from another basic_ostream (protected member function)
Formatted output
operator<<	inserts formatted data (public member function)
Unformatted output
put	inserts a character (public member function)
write	inserts blocks of characters (public member function)
Positioning
tellp	returns the output position indicator (public member function)
seekp	sets the output position indicator (public member function)
Miscellaneous
flush	synchronizes with the underlying storage device (public member function)
swap (C++11)	swaps stream objects, except for the associated buffer (protected member function)

Member classes

sentry

implements basic logic for preparation of the stream for output operations (public member class)

Non-member functions

operator<<(std::basic_ostream)	inserts character data or insert into rvalue stream (function template)
print(std::ostream) (C++23)	outputs formatted representation of the arguments (function template)
println(std::ostream) (C++23)	outputs formatted representation of the arguments with appended '\n' (function template)
vprint_unicode(std::ostream) (C++23)	performs Unicode aware output using type-erased argument representation (function)
vprint_nonunicode(std::ostream) (C++23)	outputs character data using type-erased argument representation (function)