std::basic_ifstream::open

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C++ Standard Library
Language Utilities library Strings library Containers library Algorithms library Iterators library Numerics library Input/output library Localizations library Regular expressions library (C++11) Atomic operations library (C++11) Thread support library (C++11)
Input/output library
basic_streambuf basic_filebuf basic_stringbuf ios_base basic_ios basic_istream basic_ostream basic_iostream basic_ifstream basic_ofstream basic_fstream basic_istringstream basic_ostringstream basic_stringstream I/O manipulators C-style I/O
std::basic_ifstream
Member functions basic_ifstream::basic_ifstream basic_ifstream::operator= basic_ifstream::swap basic_ifstream::rdbuf File operations basic_ifstream::is_open basic_ifstream::open basic_ifstream::close

void open( const char *filename,            ios_base::openmode mode = ios_base::in );
void open( const std::string &filename,                                              ios_base::openmode mode = ios_base::in );		(C++11 feature)

Opens and associates file with the file stream. 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).

Contents 1 Parameters 2 Return value 3 Example 4 See also

[edit] Parameters

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

[edit] Return value

(none)

[edit] Example

This section is incomplete

[edit] See also

is_open	checks if the stream has an associated file (public member function)
close	closes the associated file (public member function)