[ifstream.general]

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namespace std { template<class charT, class traits = char_traits<charT>> class basic_ifstream : public basic_istream<charT, traits> { public: using char_type = charT; using int_type = traits::int_type; using pos_type = traits::pos_type; using off_type = traits::off_type; using traits_type = traits; using native_handle_type = basic_filebuf<charT, traits>::native_handle_type; / [ifstream.cons], constructors basic_ifstream(); explicit basic_ifstream(const char* s, ios_base::openmode mode = ios_base::in); explicit basic_ifstream(const filesystem::path::value_type* s, ios_base::openmode mode = ios_base::in);/ wide systems only; see [fstream.syn] explicit basic_ifstream(const string& s, ios_base::openmode mode = ios_base::in); template<class T> explicit basic_ifstream(const T& s, ios_base::openmode mode = ios_base::in); basic_ifstream(const basic_ifstream&) = delete; basic_ifstream(basic_ifstream&& rhs); basic_ifstream& operator=(const basic_ifstream&) = delete; basic_ifstream& operator=(basic_ifstream&& rhs); / [ifstream.swap], swap void swap(basic_ifstream& rhs); / [ifstream.members], members basic_filebuf<charT, traits>* rdbuf() const; native_handle_type native_handle() const noexcept; bool is_open() const; void open(const char* s, ios_base::openmode mode = ios_base::in); void open(const filesystem::path::value_type* s, ios_base::openmode mode = ios_base::in); / wide systems only; see [fstream.syn] void open(const string& s, ios_base::openmode mode = ios_base::in); void open(const filesystem::path& s, ios_base::openmode mode = ios_base::in); void close(); private: basic_filebuf<charT, traits> sb; / exposition only }; }

The class basic_ifstream<charT, traits> supports reading from named files.

It uses a basic_filebuf<charT, traits> object to control the associated sequence.

For the sake of exposition, the maintained data is presented here as:

(1.1)
sb, the filebuf object.

31 Input/output library [input.output]

31.10 File-based streams [file.streams]

31.10.4 Class template basic_ifstream [ifstream]

31.10.4.1 General [ifstream.general]