std::basic_ostream
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C++
Feature test macros (C++20)
Concepts library (C++20)
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Ranges library (C++20)
Filesystem library (C++17)
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Execution control library (C++26)
Input/output library
Print functions (C++23)
Buffers
(C++23)
(C++98/26*)
(C++20)
Streams
Abstractions
basic_ostream
File I/O
String I/O
Array I/O
(C++23)
(C++23)
(C++23)
(C++98/26*)
(C++98/26*)
(C++98/26*)
Synchronized Output
(C++20)
Types
Error category interface
(C++11)
(C++11)
std::basic_ostream
Global objects
Member functions
(C++11)
Formatted output
Unformatted output
Positioning
Miscellaneous
(C++11)
Member classes
Non-member functions
(C++23)
(C++23)
(C++23)
(C++23)
Defined in header
<ostream>
template<
class CharT,
class Traits = std::char_traits <CharT>
The class template basic_ostream provides support for high level output operations on character streams. The supported operations include formatted output (e.g. integer values) and unformatted output (e.g. raw characters and character arrays). This functionality is implemented in terms of the interface provided by the basic_streambuf class, accessed through the basic_ios base class. In typical implementations, basic_ostream has no non-inherited data members.
std-basic ostream-inheritance.svg
Inheritance diagram
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>
Contents
[edit] Global objects
Six global basic_ostream objects are provided by the standard library:
Defined in header
<iostream> [edit] Member types
Member type
Definition
[edit] Member functions
Formatted output
Unformatted output
Positioning
Miscellaneous
[edit] Member classes
implements basic logic for preparation of the stream for output operations
(public member class) [edit]
(public member class) [edit]
[edit] Non-member functions
(C++23)
(function template) [edit]
Inherited from std::basic_ios
Member types
Member type
Definition
char_type
CharT
traits_type
Traits
int_type
Traits::int_type
pos_type
Traits::pos_type
off_type
Traits::off_type
Member functions
State functions
checks if no error has occurred i.e. I/O operations are available
(public member function of
(public member function of
std::basic_ios<CharT,Traits>) [edit]
checks if end-of-file has been reached
(public member function of
(public member function of
std::basic_ios<CharT,Traits>) [edit]
checks if a non-recoverable error has occurred
(public member function of
(public member function of
std::basic_ios<CharT,Traits>) [edit]
checks if an error has occurred (synonym of fail() )
(public member function of
(public member function of
std::basic_ios<CharT,Traits>) [edit]
checks if no error has occurred (synonym of
(public member function of
!fail() ) (public member function of
std::basic_ios<CharT,Traits>) [edit]
Formatting
Miscellaneous
Inherited from std::ios_base
Member functions
Formatting
manages decimal precision of floating point operations
(public member function of
(public member function of
std::ios_base) [edit]
Locales
Internal extensible array
[static]
(public static member function of
std::ios_base) [edit]
resizes the private storage if necessary and access to the long element at the given index
(public member function of
(public member function of
std::ios_base) [edit]
resizes the private storage if necessary and access to the void* element at the given index
(public member function of
(public member function of
std::ios_base) [edit]
Miscellaneous
[static]
(public static member function of
std::ios_base) [edit]
Member classes
Member types and constants
Type
Explanation
stream open mode type
(typedef) [edit]
The following constants are also defined:
Constant
Explanation[edit]
(typedef) [edit]
formatting flags type
(typedef) [edit]
The following constants are also defined:
Constant
Explanation[edit]
internal
internal adjustment (adds fill characters to the internal designated point): see std::internal [edit]
scientific
generate floating point types using scientific notation, or hex notation if combined with fixed: see std::scientific [edit]
fixed
generate floating point types using fixed notation, or hex notation if combined with scientific: see std::fixed [edit]
showbase
generate a prefix indicating the numeric base for integer output, require the currency indicator in monetary I/O: see std::showbase [edit]
showpoint
generate a decimal-point character unconditionally for floating-point number output: see std::showpoint [edit]
uppercase
replace certain lowercase letters with their uppercase equivalents in certain output operations: see std::uppercase [edit]
(typedef) [edit]
state of the stream type
(typedef) [edit]
The following constants are also defined:
Constant
Explanation[edit]
(typedef) [edit]