std::basic_ifstream::basic_ifstream

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basic_ifstream( const char *filename, ios_base::openmode mode = ios_base::in );	(1)

basic_ifstream( const string &filename, ios_base::openmode mode = ios_base::in );	(2)	(since C++11)

basic_ifstream( basic_ifstream&& other );	(3)	(since C++11)

Constructs new file stream.

1-2) Associates the stream with a file after the constriction. Calls clear() on success or setstate(failbit) on failure.

The first version effectively calls rdbuf()->open(filename, mode | ios_base::in).

The second version effectively calls open(filename.c_str(), mode).

3) Move constructor. Constructs the file stream with the state of other using move semantics.

filename - the name of the file to be opened

mode

-

specifies stream open mode. It is bitmask type, the following constants are defined:


Constant	Explanation

`app`	seek to the end of stream before each write

`binary`	open in binary mode

`in`	open for reading

`out`	open for writing

`trunc`	discard the contents of the stream when opening

`ate`	seek to the end of stream immediately after open

other - another file stream to use as source


open	opens a file and associates it with the stream (public member function)

Language
Concepts
Utilities library
Strings library
Containers library
Algorithms library
Iterators library
Numerics library
Input/output library
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Regular expressions library (C++11)
Atomic operations library (C++11)
Thread support library (C++11)