2.6 KiB
[ifstream.general]
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]
namespace std {template<class charT, class traits = char_traits>class basic_ifstream : public basic_istream<charT, traits> {public:using char_type = charT; using int_type = typename traits::int_type; using pos_type = typename traits::pos_type; using off_type = typename traits::off_type; using traits_type = traits; using native_handle_type = typename 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); templateexplicit 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], swapvoid 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 classbasic_ifstream<charT, traits> supports reading from named files.
It uses abasic_filebuf<charT, traits> object to control the associated sequence.
For the sake of exposition, the maintained data is presented here as:
sb, the filebuf object.