C++ Library - <fstream>-alljchome-开发者的教程家园

The C Standard Library

The C Standard Library

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C++ Library - <fstream>

Introduction

This data type represents the file stream generally, and has the capabipties of both ofstream and ifstream which means it can create files, write information to files, and read information from files.

Definition

Below is definition of std::fstream.

template<
   class CharT, 
   class Traits = std::char_traits<CharT>> 
class basic_fstream : pubpc std::basic_iostream<CharT, Traits>

Parameters

charT − Apased as member char_type.

traits − Apased as member traits_type.

Member types

Following member types can be used as parameters or return type by member functions.

Sr.No.	Member types	Definition
1	char	Character Type
2	char_traits<char>	traits_type
3	int	const value_type
4	int	int_type
5	streampos	pos_type
6	streamoff	off_type

Functions from <fstream>

Below is pst of all methods from <fstream>

Member functions

Sr.No.	Method & description
1	fstream::close Closes the file currently associated with the object, disassociating it from the stream.
2	fstream::is_open Returns whether the stream is currently associated to a file.
3	fstream::open Opens the file identified by argument filename, associating it with the stream object.
4	fstream::operator= Returns a constant iterator which points to the start of the array.
5	fstream::rdbuf Returns a pointer to the internal filebuf object.
6	fstream::swap Exchanges all internal data between x and *this.

Non-member overloaded functions

Sr.No.	Method & description
1	swap-free Exchanges the values of the fstream objects x and y.