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.
Inheritance diagram
Several typedefs for common character types are provided:
Type Definitionstd::ios std::basic_ios<char> std::wios std::basic_ios<wchar_t> [edit] Member types Member type Definition char_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] Public member functions constructs the object
!fail())
rdbuf
rdbuf
rdbuf without clearing its error state
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:
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):
fill())tie())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.
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