std::basic_ostream - cppreference.com (original) (raw)

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:
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:

[edit] Member types

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

[edit] Member functions

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

[edit] Member classes

| | implements basic logic for preparation of the stream for output operations (public member class) [edit] | | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |

[edit] Non-member functions

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
good checks if no error has occurred i.e. I/O operations are available (public member function of std::basic_ios<CharT,Traits>) [edit]
eof checks if end-of-file has been reached (public member function of std::basic_ios<CharT,Traits>) [edit]
fail checks if an error has occurred (public member function of std::basic_ios<CharT,Traits>) [edit]
bad checks if a non-recoverable error has occurred (public member function of std::basic_ios<CharT,Traits>) [edit]
operator! checks if an error has occurred (synonym of fail()) (public member function of std::basic_ios<CharT,Traits>) [edit]
operator bool checks if no error has occurred (synonym of fail()) (public member function of std::basic_ios<CharT,Traits>) [edit]
rdstate returns state flags (public member function of std::basic_ios<CharT,Traits>) [edit]
setstate sets state flags (public member function of std::basic_ios<CharT,Traits>) [edit]
clear modifies state flags (public member function of std::basic_ios<CharT,Traits>) [edit]
Formatting
copyfmt copies formatting information (public member function of std::basic_ios<CharT,Traits>) [edit]
fill manages the fill character (public member function of std::basic_ios<CharT,Traits>) [edit]
Miscellaneous
exceptions manages exception mask (public member function of std::basic_ios<CharT,Traits>) [edit]
imbue sets the locale (public member function of std::basic_ios<CharT,Traits>) [edit]
rdbuf manages associated stream buffer (public member function of std::basic_ios<CharT,Traits>) [edit]
tie manages tied stream (public member function of std::basic_ios<CharT,Traits>) [edit]
narrow narrows characters (public member function of std::basic_ios<CharT,Traits>) [edit]
widen widens characters (public member function of std::basic_ios<CharT,Traits>) [edit]

Inherited from std::ios_base

Member functions

Formatting
flags manages format flags (public member function of std::ios_base) [edit]
setf sets specific format flag (public member function of std::ios_base) [edit]
unsetf clears specific format flag (public member function of std::ios_base) [edit]
precision manages decimal precision of floating point operations (public member function of std::ios_base) [edit]
width manages field width (public member function of std::ios_base) [edit]
Locales
imbue sets locale (public member function of std::ios_base) [edit]
getloc returns current locale (public member function of std::ios_base) [edit]
Internal extensible array
xalloc[static] returns a program-wide unique integer that is safe to use as index to pword() and iword() (public static member function of std::ios_base) [edit]
iword resizes the private storage if necessary and access to the long element at the given index (public member function of std::ios_base) [edit]
pword resizes the private storage if necessary and access to the void* element at the given index (public member function of std::ios_base) [edit]
Miscellaneous
register_callback registers event callback function (public member function of std::ios_base) [edit]
sync_with_stdio[static] sets whether C++ and C I/O libraries are interoperable (public static member function of std::ios_base) [edit]
Member classes
failure stream exception (public member class of std::ios_base) [edit]
Init initializes standard stream objects (public member class of std::ios_base) [edit]