Showing content from https://www.tutorialspoint.com/cpp_standard_library/cpp_basic_ios.htm below:
C++ Library - <basic_ios>
C++ Library - <basic_ios> Introduction
Basic_ios define the components of streams that do not depend on whether the stream is an input or an output stream: ios_base describes the members that are independent of the template parameters (i.e. the character type and traits), while basic_ios describes the members that do depend on them.
Definition
Below is definition of basic_ios as shown below −
template <class charT, class traits = char_traits<charT> >
class ios_base;
Parameters
Parameters of basic_ios should be like this −
Member types Sr.No. Member types Definition 1 event Type to indicate event type 2 event_callback Event callback function type 3 failure Base class for stream exceptions 4 fmtflags Type for stream format flags 5 Init Initialize standard stream objects 6 iostate Type for stream state flags 7 openmode Type for stream opening mode flags 8 seekdir Type for stream seeking direction flag Public Member Functions Sr.No. Member types Definition 1 (constructor) Construct object (public member function ) 2 (destructor) Destruct object (public member function ) State flag functions Sr.No. Member types Definition 1 good It is used to check whether state of stream is good 2 eof It is used to check whether eofbit is set 3 fail It is used to check whether either failbit or badbit is set 4 bad It is used to check whether badbit is set 5 operator! Evaluate stream 6 rdstate It is used to get error state flags 7 setstate It is used to set error state flag 8 clear It is used to set error state flag Formatting Sr.No. Member types Definition 1 copyfmt Copy formatting information 2 fill Get/set fill character Others Sr.No. Member types Definition 1 exceptions It is used to get/set exceptions mask 2 imbue Imbue locale 3 tie It is used to get/set tied stream 4 rdbuf It is used to get/set stream buffer 5 narrow Narrow character 6 widen Widen character Protected member functions Sr.No. Member types Definition 1 init Initialize object 2 move Move internals 3 swap Swap internals 4 set_rdbuf It is used to set stream buffer
ios.htm
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