The class template basic_istream provides support for high level input operations on character streams. The supported operations include formatted input (e.g. integer values or whitespace-separated characters and characters strings) and unformatted input (e.g. raw characters and character arrays). This functionality is implemented in terms of the interface provided by the underlying basic_streambuf class, accessed through the basic_ios base class. The only non-inherited data member of basic_istream, in most implementations, is the value returned by basic_istream::gcount().
Inheritance diagram
Several typedefs for common character types are provided:
Type Definitionstd::istream std::basic_istream<char> std::wistream std::basic_istream<wchar_t> [edit] Global objects
Two global basic_istream objects are provided by the standard library.
[edit] Member types Member type Definitionchar_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 constructs the object
basic_istream
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
std::basic_ios<CharT,Traits>) [edit] checks if end-of-file has been reached
std::basic_ios<CharT,Traits>) [edit] checks if an error has occurred
std::basic_ios<CharT,Traits>) [edit] checks if a non-recoverable error has occurred
std::basic_ios<CharT,Traits>) [edit] checks if an error has occurred (synonym of fail())
std::basic_ios<CharT,Traits>) [edit] checks if no error has occurred (synonym of !fail())
std::basic_ios<CharT,Traits>) [edit] returns state flags
std::basic_ios<CharT,Traits>) [edit] sets state flags
std::basic_ios<CharT,Traits>) [edit] modifies state flags
std::basic_ios<CharT,Traits>) [edit] Formatting copies formatting information
std::basic_ios<CharT,Traits>) [edit] manages the fill character
std::basic_ios<CharT,Traits>) [edit] Miscellaneous manages exception mask
std::basic_ios<CharT,Traits>) [edit] sets the locale
std::basic_ios<CharT,Traits>) [edit] manages associated stream buffer
std::basic_ios<CharT,Traits>) [edit] manages tied stream
std::basic_ios<CharT,Traits>) [edit] narrows characters
std::basic_ios<CharT,Traits>) [edit] widens characters
std::basic_ios<CharT,Traits>) [edit] Inherited from std::ios_base Member functions Formatting manages format flags
std::ios_base) [edit] sets specific format flag
std::ios_base) [edit] clears specific format flag
std::ios_base) [edit] manages decimal precision of floating point operations
std::ios_base) [edit] manages field width
std::ios_base) [edit] Locales sets locale
std::ios_base) [edit] returns current locale
std::ios_base) [edit] Internal extensible array returns a program-wide unique integer that is safe to use as index to pword() and iword()
std::ios_base) [edit] resizes the private storage if necessary and access to the long element at the given index
std::ios_base) [edit] resizes the private storage if necessary and access to the void* element at the given index
std::ios_base) [edit] Miscellaneous registers event callback function
std::ios_base) [edit] sets whether C++ and C I/O libraries are interoperable
std::ios_base) [edit] Member classes stream exception
std::ios_base) [edit] initializes standard stream objects
std::ios_base) [edit] Member types and constants Type Explanation stream open mode type
The following constants are also defined:
The following constants are also defined:
The following constants are also defined:
The following constants are also defined:
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