| Defined in header <istream> | ||
|---|---|---|
template<
class CharT,
class Traits = std::char_traits<CharT>
> class basic_iostream; |
The class template basic_iostream provides support for high level input/output operations on streams. The supported operations include sequential reading or writing and formatting. This functionality is implemented over the interface, provided by the basic_streambuf class. It is accessed through basic_ios class.
Inheritance diagram.
Two specializations for common character types are defined:
| Defined in header <istream> | |
|---|---|
| Type | Definition |
iostream | basic_iostream<char> |
wiostream | basic_iostream<wchar_t> |
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
| constructs the object (public member function) | |
| (destructor)
[virtual] | destructs the object (virtual public member function) |
Protected member functions
| operator=
(C++11) | move-assigns another basic_iostream (public member function) |
| (C++11) | exchanges the state with another basic_iostream (public member function) |
Inherited from std::basic_istream
Member functions
Formatted input | |
| extracts formatted data (public member function of std::basic_istream) | |
Unformatted input | |
| extracts characters (public member function of std::basic_istream) | |
| reads the next character without extracting it (public member function of std::basic_istream) | |
| unextracts a character (public member function of std::basic_istream) | |
| puts character into input stream (public member function of std::basic_istream) | |
| extracts characters until the given character is found (public member function of std::basic_istream) | |
| extracts and discards characters until the given character is found (public member function of std::basic_istream) | |
| extracts blocks of characters (public member function of std::basic_istream) | |
| extracts already available blocks of characters (public member function of std::basic_istream) | |
| returns number of characters extracted by last unformatted input operation (public member function of std::basic_istream) | |
Positioning | |
| returns the input position indicator (public member function of std::basic_istream) | |
| sets the input position indicator (public member function of std::basic_istream) | |
Miscellaneous | |
| synchronizes with the underlying storage device (public member function of std::basic_istream) | |
Member classes
| implements basic logic for preparation of the stream for input operations (public member class of std::basic_istream) |
Inherited from std::basic_ostream
Member functions
Formatted input | |
| inserts formatted data (public member function of std::basic_ostream) | |
Unformatted input | |
| inserts a character (public member function of std::basic_ostream) | |
| inserts blocks of characters (public member function of std::basic_ostream) | |
Positioning | |
| returns the output position indicator (public member function of std::basic_ostream) | |
| sets the output position indicator (public member function of std::basic_ostream) | |
Miscellaneous | |
| synchronizes with the underlying storage device (public member function of std::basic_ostream) | |
Member classes
| implements basic logic for preparation of the stream for output operations (public member class of std::basic_ostream) |
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 std::basic_ios) | |
| checks if end-of-file has been reached (public member function of std::basic_ios) | |
| checks if a recoverable error has occurred (public member function of std::basic_ios) | |
| checks if a non-recoverable error has occurred (public member function of std::basic_ios) | |
| operator!
| checks if an error has occurred (synonym of fail()) (public member function of std::basic_ios) |
| (until C++11)(since C++11) | checks if no error has occurred (synonym of !fail()) (public member function of std::basic_ios) |
| returns state flags (public member function of std::basic_ios) | |
| sets state flags (public member function of std::basic_ios) | |
| clears error and eof flags (public member function of std::basic_ios) | |
Formatting | |
| copies formatting information (public member function of std::basic_ios) | |
| manages the fill character (public member function of std::basic_ios) | |
Miscellaneous | |
| manages exception mask (public member function of std::basic_ios) | |
| sets the locale (public member function of std::basic_ios) | |
| manages associated stream buffer (public member function of std::basic_ios) | |
| manages tied stream (public member function of std::basic_ios) | |
| narrows characters (public member function of std::basic_ios) | |
| widens characters (public member function of std::basic_ios) | |
Inherited from std::ios_base
Member functions
Formatting | |
| manages format flags (public member function of std::ios_base) | |
| sets specific format flag (public member function of std::ios_base) | |
| clears specific format flag (public member function of std::ios_base) | |
| manages decimal precision of floating point operations (public member function of std::ios_base) | |
| manages field width (public member function of std::ios_base) | |
Locales | |
| sets locale (public member function of std::ios_base) | |
| returns current locale (public member function of std::ios_base) | |
Internal extensible array | |
| [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) |
resizes the private storage if necessary and access to the long element at the given index (public member function of std::ios_base) | |
resizes the private storage if necessary and access to the void* element at the given index (public member function of std::ios_base) | |
Miscellaneous | |
| registers event callback function (public member function of std::ios_base) | |
| [static] | sets whether C++ and C IO libraries are interoperable (public static member function of std::ios_base) |
Member classes | |
| stream exception (public member class of std::ios_base) | |
| initializes standard stream objects (public member class of std::ios_base) | |
Member types and constants | |||||||||||||||||||||||||||||||||||||||
| Type | Explanation | ||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| stream open mode type The following constants are also defined:
(typedef) | |||||||||||||||||||||||||||||||||||||||
| formatting flags type The following constants are also defined:
(typedef) | |||||||||||||||||||||||||||||||||||||||
| state of the stream type The following constants are also defined:
(typedef) | |||||||||||||||||||||||||||||||||||||||
| seeking direction type The following constants are also defined:
(typedef) | |||||||||||||||||||||||||||||||||||||||
| specifies event type (enum) | |||||||||||||||||||||||||||||||||||||||
| callback function type (typedef) | |||||||||||||||||||||||||||||||||||||||
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