std::basic_fstream::open

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

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).

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

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

Return value

(none)

See also

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