std::basic_ios
Defined in header
<ios>
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template<
class CharT, |
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The class std::basic_ios
provides facilities for interfacing with objects that have std::basic_streambuf interface. Several std::basic_ios
objects can refer to one actual std::basic_streambuf
object.
Two specializations for common character types are also provided:
Type | Definition |
ios
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basic_ios<char> |
wios
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basic_ios<wchar_t> |
Contents |
[edit] Member types
Member type | Definition |
char_type
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CharT |
traits_type
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Traits |
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 |
[edit] Public member functions
constructs the object (public member function) |
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[virtual]
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destructs the object (virtual public member function) |
operator= |
the copy assignment operator is deleted (public member function) |
State functions |
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checks if no error has occurred i.e. I/O operations are available (public member function) |
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checks if end-of-file has been reached (public member function) |
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checks if a recoverable error has occurred (public member function) |
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checks if a non-recoverable error has occurred (public member function) |
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checks if an error has occurred (synonym of fail()) (public member function) |
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(until C++11)(since C++11)
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checks if no error has occurred (synonym of !fail()) (public member function) |
returns state flags (public member function) |
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sets state flags (public member function) |
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clears error and eof flags (public member function) |
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Formatting |
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copies formatting information (public member function) |
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manages the fill character (public member function) |
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Miscellaneous |
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manages exception mask (public member function) |
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sets the locale (public member function) |
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manages associated stream buffer (public member function) |
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manages tied stream (public member function) |
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narrows characters (public member function) |
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widens characters (public member function) |
[edit] Protected member functions
initializes a default-constructed std::basic_ios (protected member function) |
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(C++11)
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moves from another std::basic_ios except for rdbuf (protected member function) |
(C++11)
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swaps with another std::basic_ios except for rdbuf (protected member function) |
replaces the rdbuf without clearing its error state (protected member function) |
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 IO 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 | ||||||||||||||||||||||||||||||||||||||
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) |
[edit] Notes
Straightforward implementation of std::basic_ios
stores only the following members (which all depend on the template parameters and thus cannot be part of std::ios_base):
- the fill character (see
fill()
) - the tied stream pointer (see
tie()
) - the associated stream buffer pointer (see
rdbuf()
)
Actual implementations vary:
Microsoft Visual Studio stores just those three members.
LLVM libc++ stores 1 less member: it maintains the rdbuf pointer as a void* member of ios_base.
GNU libstdc++ stores 4 additional members: three cached facets and a flag to indicate that fill was initialized