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 file …

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 mode is …

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 buffer).

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

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 throws …

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, basic_ostream and …

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 state. Any …

Data races Accesses the fstream object. Concurrent access to the same stream may introduce data races. Exception safety Strong guarantee: if an exception is thrown, there are no changes in the …

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 the …

Stream buffer to read from and write to files. Constructed without association, these objects are associated to a file by calling member open. Once open, all input/output operations performed on the …