std::basic_istringstream
| Defined in header <sstream>
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| template< class CharT, |
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The class template std::basic_istringstream implements input operations on string based streams. It effectively stores an instance of std::basic_string and performs input operations on it.
At the low level, the class essentially wraps a raw string device implementation of std::basic_stringbuf into a higher-level interface of std::basic_istream. The complete interface to unique std::basic_stringbuf members is provided.
Inheritance diagram
Several typedefs for common character types are provided:
| Defined in header
<sstream> | |
| Type | Definition |
std::istringstream
|
std::basic_istringstream<char> |
std::wistringstream
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std::basic_istringstream<wchar_t> |
Member types
| Member type | Definition |
char_type
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CharT |
traits_type
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Traits; the program is ill-formed if Traits::char_type is not CharT. |
int_type
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Traits::int_type |
pos_type
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Traits::pos_type |
off_type
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Traits::off_type |
allocator_type
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Allocator |
Exposition-only members
| Name | Definition |
sb
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the std::basic_stringbuf<CharT, Traits, Allocator> used as the underlying buffer (exposition-only member object*) |
Member functions
| constructs the string stream (public member function) | |
| (C++11) |
moves the string stream (public member function) |
| (C++11) |
swaps two string streams (public member function) |
| returns the underlying raw string device object (public member function) | |
String operations | |
| gets or sets the contents of underlying string device object (public member function) | |
| (C++20) |
obtains a view over the contents of underlying string device object (public member function) |
Non-member functions
| specializes the std::swap algorithm (function template) |
Inherited from std::basic_istream
Member functions
Formatted input | |
| extracts formatted data (public member function of std::basic_istream<CharT,Traits>) | |
Unformatted input | |
| extracts characters (public member function of std::basic_istream<CharT,Traits>) | |
| reads the next character without extracting it (public member function of std::basic_istream<CharT,Traits>) | |
| unextracts a character (public member function of std::basic_istream<CharT,Traits>) | |
| puts a character into input stream (public member function of std::basic_istream<CharT,Traits>) | |
| extracts characters until the given character is found (public member function of std::basic_istream<CharT,Traits>) | |
| extracts and discards characters until the given character is found (public member function of std::basic_istream<CharT,Traits>) | |
| extracts blocks of characters (public member function of std::basic_istream<CharT,Traits>) | |
| extracts already available blocks of characters (public member function of std::basic_istream<CharT,Traits>) | |
| returns number of characters extracted by last unformatted input operation (public member function of std::basic_istream<CharT,Traits>) | |
Positioning | |
| returns the input position indicator (public member function of std::basic_istream<CharT,Traits>) | |
| sets the input position indicator (public member function of std::basic_istream<CharT,Traits>) | |
Miscellaneous | |
| synchronizes with the underlying storage device (public member function of std::basic_istream<CharT,Traits>) | |
Member classes
| implements basic logic for preparation of the stream for input operations (public member class of std::basic_istream<CharT,Traits>) |
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 | |
| checks if no error has occurred i.e. I/O operations are available (public member function of std::basic_ios<CharT,Traits>) | |
| checks if end-of-file has been reached (public member function of std::basic_ios<CharT,Traits>) | |
| checks if an error has occurred (public member function of std::basic_ios<CharT,Traits>) | |
| checks if a non-recoverable error has occurred (public member function of std::basic_ios<CharT,Traits>) | |
| checks if an error has occurred (synonym of fail()) (public member function of std::basic_ios<CharT,Traits>) | |
checks if no error has occurred (synonym of !fail()) (public member function of std::basic_ios<CharT,Traits>) | |
| returns state flags (public member function of std::basic_ios<CharT,Traits>) | |
| sets state flags (public member function of std::basic_ios<CharT,Traits>) | |
| modifies state flags (public member function of std::basic_ios<CharT,Traits>) | |
Formatting | |
| copies formatting information (public member function of std::basic_ios<CharT,Traits>) | |
| manages the fill character (public member function of std::basic_ios<CharT,Traits>) | |
Miscellaneous | |
| manages exception mask (public member function of std::basic_ios<CharT,Traits>) | |
| sets the locale (public member function of std::basic_ios<CharT,Traits>) | |
| manages associated stream buffer (public member function of std::basic_ios<CharT,Traits>) | |
| manages tied stream (public member function of std::basic_ios<CharT,Traits>) | |
| narrows characters (public member function of std::basic_ios<CharT,Traits>) | |
| widens characters (public member function of std::basic_ios<CharT,Traits>) | |
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 I/O 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:
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| formatting flags type
The following constants are also defined:
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| state of the stream type
The following constants are also defined:
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| seeking direction type
The following constants are also defined:
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| specifies event type (enum) | |||||||||||||||||||||||||||||||||||||||
| callback function type (typedef) | |||||||||||||||||||||||||||||||||||||||