File streams are associated with files either on construction, or by calling member open. This is an instantiation of basic_fstream with the following template parameters: ... Apart from the internal …

Constructs an fstream object that is not associated with any file. Internally, its iostream base constructor is passed a pointer to a newly constructed filebuf object (the internal file stream …

For fstream, the default value is only applied if the function is called without specifying any value for the mode parameter. If the function is called with any value in that parameter the default …

<fstream> File streams Header providing file stream classes: Class templates basic_ifstream Input file stream (class template) basic_ofstream Output file stream (class template) …

Modifies the fstream object. Concurrent access to the same stream object introduce data races. Exception safety Basic guarantee: if an exception is thrown, the stream is in a valid state. It …

These instantiations are declared in <fstream>. Member types The class declares the following member types: ... These member types are inherited from its base classes basic_istream, …

Data races Modifies the fstream object. Concurrent access to the same stream may introduce data races. Exception safety Basic guarantee: if an exception is thrown, the stream is in a valid …

Input/output stream class to operate on files using wide characters. This is an instantiation of basic_fstream with the following template parameters: ... Apart from the internal file buffer of …

Output stream class to operate on files. Objects of this class maintain a filebuf object as their internal stream buffer, which performs input/output operations on the file they are associated …

Parameters filename String with the name of the file to open. Specifics about its format and validity depend on the library implementation and running environment. mode Flags describing …