std:: basic_iostream
From cppreference.com
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Defined in header
<istream>
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template
<
class
CharT,
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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
std::basic_streambuf
class. It is accessed through
std::basic_ios
class.
Inheritance diagram
Several typedefs for common character types are provided:
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Defined in header
<istream>
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| Type | Definition |
std::iostream
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std :: basic_iostream < char > |
std::wiostream
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std :: basic_iostream < wchar_t > |
Member types
| Member type | Definition |
char_type
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CharT
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traits_type
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Traits
; the program is ill-formed if
Traits::char_type
is not
CharT
.
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int_type
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Traits::int_type
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pos_type
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Traits::pos_type
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off_type
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Traits::off_type
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Member functions
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constructs the object
(public member function) |
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[virtual]
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destructs the object
(virtual public member function) |
Protected member functions
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(C++11)
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move-assigns another
basic_iostream
(protected member function) |
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(C++11)
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exchanges the state with another
basic_iostream
(public member function) |
Inherited from std:: basic_istream
Member functions
Formatted input |
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extracts formatted data
(public member function of
std::basic_istream<CharT,Traits>
)
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Unformatted input |
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extracts characters
(public member function of
std::basic_istream<CharT,Traits>
)
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reads the next character without extracting it
(public member function of
std::basic_istream<CharT,Traits>
)
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unextracts a character
(public member function of
std::basic_istream<CharT,Traits>
)
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puts a character into input stream
(public member function of
std::basic_istream<CharT,Traits>
)
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extracts characters until the given character is found
(public member function of
std::basic_istream<CharT,Traits>
)
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extracts and discards characters until the given character is found
(public member function of
std::basic_istream<CharT,Traits>
)
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extracts blocks of characters
(public member function of
std::basic_istream<CharT,Traits>
)
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extracts already available blocks of characters
(public member function of
std::basic_istream<CharT,Traits>
)
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returns number of characters extracted by last unformatted input operation
(public member function of
std::basic_istream<CharT,Traits>
)
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Positioning |
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returns the input position indicator
(public member function of
std::basic_istream<CharT,Traits>
)
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sets the input position indicator
(public member function of
std::basic_istream<CharT,Traits>
)
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Miscellaneous |
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synchronizes with the underlying storage device
(public member function of
std::basic_istream<CharT,Traits>
)
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Member classes
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implements basic logic for preparation of the stream for input operations
(public member class of
std::basic_istream<CharT,Traits>
)
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Inherited from std:: basic_ostream
Member functions
Formatted output |
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inserts formatted data
(public member function of
std::basic_ostream<CharT,Traits>
)
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Unformatted output |
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inserts a character
(public member function of
std::basic_ostream<CharT,Traits>
)
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inserts blocks of characters
(public member function of
std::basic_ostream<CharT,Traits>
)
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Positioning |
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returns the output position indicator
(public member function of
std::basic_ostream<CharT,Traits>
)
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sets the output position indicator
(public member function of
std::basic_ostream<CharT,Traits>
)
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Miscellaneous |
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synchronizes with the underlying storage device
(public member function of
std::basic_ostream<CharT,Traits>
)
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Member classes
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implements basic logic for preparation of the stream for output operations
(public member class of
std::basic_ostream<CharT,Traits>
)
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Inherited from std:: basic_ios
Member types
| Member type | Definition |
char_type
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CharT
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traits_type
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Traits
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int_type
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Traits::int_type
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pos_type
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Traits::pos_type
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off_type
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Traits::off_type
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Member functions
State functions |
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checks if no error has occurred i.e. I/O operations are available
(public member function of
std::basic_ios<CharT,Traits>
)
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checks if end-of-file has been reached
(public member function of
std::basic_ios<CharT,Traits>
)
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checks if an error has occurred
(public member function of
std::basic_ios<CharT,Traits>
)
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checks if a non-recoverable error has occurred
(public member function of
std::basic_ios<CharT,Traits>
)
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checks if an error has occurred (synonym of
fail()
)
(public member function of
std::basic_ios<CharT,Traits>
)
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checks if no error has occurred (synonym of
!
fail()
)
(public member function of
std::basic_ios<CharT,Traits>
)
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returns state flags
(public member function of
std::basic_ios<CharT,Traits>
)
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sets state flags
(public member function of
std::basic_ios<CharT,Traits>
)
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modifies state flags
(public member function of
std::basic_ios<CharT,Traits>
)
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Formatting |
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copies formatting information
(public member function of
std::basic_ios<CharT,Traits>
)
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manages the fill character
(public member function of
std::basic_ios<CharT,Traits>
)
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Miscellaneous |
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manages exception mask
(public member function of
std::basic_ios<CharT,Traits>
)
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sets the locale
(public member function of
std::basic_ios<CharT,Traits>
)
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manages associated stream buffer
(public member function of
std::basic_ios<CharT,Traits>
)
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manages tied stream
(public member function of
std::basic_ios<CharT,Traits>
)
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narrows characters
(public member function of
std::basic_ios<CharT,Traits>
)
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widens characters
(public member function of
std::basic_ios<CharT,Traits>
)
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Inherited from std:: ios_base
Member functions
Formatting |
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manages format flags
(public member function of
std::ios_base
)
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sets specific format flag
(public member function of
std::ios_base
)
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clears specific format flag
(public member function of
std::ios_base
)
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manages decimal precision of floating point operations
(public member function of
std::ios_base
)
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manages field width
(public member function of
std::ios_base
)
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Locales |
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sets locale
(public member function of
std::ios_base
)
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returns current locale
(public member function of
std::ios_base
)
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Internal extensible array |
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[static]
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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
)
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resizes the private storage if necessary and access to the
long
element at the given index
(public member function of
std::ios_base
)
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resizes the private storage if necessary and access to the
void
*
element at the given index
(public member function of
std::ios_base
)
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Miscellaneous |
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registers event callback function
(public member function of
std::ios_base
)
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[static]
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sets whether C++ and C I/O libraries are interoperable
(public static member function of
std::ios_base
)
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Member classes |
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stream exception
(public member class of
std::ios_base
)
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initializes standard stream objects
(public member class of
std::ios_base
)
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Member types and constants |
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| Type | Explanation | ||||||||||||||||||||||||||||||||||||||
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stream open mode type
The following constants are also defined:
(typedef) |
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formatting flags type
The following constants are also defined:
(typedef) |
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state of the stream type
The following constants are also defined:
(typedef) |
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seeking direction type
The following constants are also defined:
(typedef) |
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specifies event type
(enum) |
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callback function type
(typedef) |
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Defect reports
The following behavior-changing defect reports were applied retroactively to previously published C++ standards.
| DR | Applied to | Behavior as published | Correct behavior |
|---|---|---|---|
| LWG 271 | C++98 |
the member types
char_type
,
traits_type
,
int_type
,
pos_type
and
off_type
were not defined
( std::basic_istream and std::basic_ostream both define these types, resulted in ambiguity) |
define
these types |