C++ Library - <istream>


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Introduction

Input stream objects can read and interpret input from sequences of characters. Specific members are provided to perform these input operations.

Definition

Below is definition of std::istream.

typedef basic_istream<char> istream;

Parameters

  • char_type − Character type.

  • traits − Character traits class that defines essential properties of the characters used by stream objects.

  • int_type − Integer Type.

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
9 basic_istream::sentry It is used to prepare stream for input
10 seekdirbasic_ostream::sentry It is used to prepare stream for output

Public Member Functions

Sr.No. Member types Definition
1 (constructor) Construct object (public member function )
2 (destructor) Destruct object (public member function )

Public member functions

Sr.No. Member Functions Definition
1 gcount It is used to get character count
2 get It is used to get characters
3 getline It is used to get line
4 ignore It is used to extract and discard characters
5 peek It is used to peek next character
6 read It is used to read block of data
7 readsome It is used to Read data available in buffer
8 putback It is used to put character back
9 unget It is used to unget character
10 operator>> It is used to extract formatted input

Public member functions inherited from basic_ios

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
9 fill Get/set fill character
10 exceptions It is used to get/set exceptions mask
11 imbue Imbue locale
12 tie It is used to get/set tied stream
13 rdbuf It is used to get/set stream buffer
14 narrow Narrow character
15 widen Widen character
istream.htm
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