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std::basic_fstream< _CharT, _Traits >(3cxx) std::basic_fstream< _CharT, _Traits >(3cxx)

NAME

std::basic_fstream< _CharT, _Traits > - Controlling input and output for files.

SYNOPSIS

Inherits std::basic_iostream< _CharT, _Traits >.

Public Types


typedef basic_filebuf< char_type, traits_type > __filebuf_type
typedef basic_ios< char_type, traits_type > __ios_type
typedef basic_iostream< char_type, traits_type > __iostream_type
typedef basic_istream< _CharT, _Traits > __istream_type
typedef basic_ostream< _CharT, _Traits > __ostream_type
typedef _CharT char_type
typedef traits_type::int_type int_type
typedef traits_type::off_type off_type
typedef traits_type::pos_type pos_type
typedef _Traits traits_type

Public Member Functions


basic_fstream ()
Default constructor. basic_fstream (basic_fstream &&__rhs)
basic_fstream (const basic_fstream &)=delete
basic_fstream (const char *__s, ios_base::openmode __mode=ios_base::in|ios_base::out)
Create an input/output file stream. basic_fstream (const std::string &__s, ios_base::openmode __mode=ios_base::in|ios_base::out)
Create an input/output file stream. ~basic_fstream ()
The destructor does nothing. void close ()
Close the file. bool is_open ()
Wrapper to test for an open file. bool is_open () const
void open (const char *__s, ios_base::openmode __mode=ios_base::in|ios_base::out)
Opens an external file. void open (const std::string &__s, ios_base::openmode __mode=ios_base::in|ios_base::out)
Opens an external file. basic_fstream & operator= (basic_fstream &&__rhs)
basic_fstream & operator= (const basic_fstream &)=delete
__filebuf_type * rdbuf () const
Accessing the underlying buffer. void swap (basic_fstream &__rhs)

Protected Member Functions


void swap (basic_iostream &__rhs)

Detailed Description

template<typename _CharT, typename _Traits>

class std::basic_fstream< _CharT, _Traits >" Controlling input and output for files.

Template Parameters

_CharT Type of character stream.
_Traits Traits for character type, defaults to char_traits<_CharT>.

This class supports reading from and writing to named files, using the inherited functions from std::basic_iostream. To control the associated sequence, an instance of std::basic_filebuf is used, which this page refers to as sb.

Definition at line 1016 of file fstream.

Constructor & Destructor Documentation

template<typename _CharT , typename _Traits > std::basic_fstream< _CharT, _Traits >::basic_fstream () [inline]

Default constructor. Initializes sb using its default constructor, and passes &sb to the base class initializer. Does not open any files (you haven't given it a filename to open).

Definition at line 1043 of file fstream.

template<typename _CharT , typename _Traits > std::basic_fstream< _CharT, _Traits >::basic_fstream (const char * __s, ios_base::openmode __mode = ios_base::in | ios_base::out) [inline], [explicit]

Create an input/output file stream.

Parameters

__s Null terminated string specifying the filename.
__mode Open file in specified mode (see std::ios_base).

Definition at line 1053 of file fstream.

template<typename _CharT , typename _Traits > std::basic_fstream< _CharT, _Traits >::basic_fstream (const std::string & __s, ios_base::openmode __mode = ios_base::in | ios_base::out) [inline], [explicit]

Create an input/output file stream.

Parameters

__s Null terminated string specifying the filename.
__mode Open file in specified mode (see std::ios_base).

Definition at line 1083 of file fstream.

template<typename _CharT , typename _Traits > std::basic_fstream< _CharT, _Traits >::~basic_fstream () [inline]

The destructor does nothing. The file is closed by the filebuf object, not the formatting stream.

Definition at line 1118 of file fstream.

Member Function Documentation

template<typename _CharT , typename _Traits > void std::basic_fstream< _CharT, _Traits >::close () [inline]

Close the file. Calls std::basic_filebuf::close(). If that function fails, failbit is set in the stream's error state.

Definition at line 1253 of file fstream.

template<typename _CharT , typename _Traits > bool std::basic_fstream< _CharT, _Traits >::is_open () [inline]

Wrapper to test for an open file.

Returns

rdbuf()->is_open()

Definition at line 1159 of file fstream.

template<typename _CharT , typename _Traits > void std::basic_fstream< _CharT, _Traits >::open (const char * __s, ios_base::openmode __mode = ios_base::in | ios_base::out) [inline]

Opens an external file.

Parameters

__s The name of the file.
__mode The open mode flags.

Calls std::basic_filebuf::open(__s,__mode). If that function fails, failbit is set in the stream's error state.

Definition at line 1177 of file fstream.

template<typename _CharT , typename _Traits > void std::basic_fstream< _CharT, _Traits >::open (const std::string & __s, ios_base::openmode __mode = ios_base::in | ios_base::out) [inline]

Opens an external file.

Parameters

__s The name of the file.
__mode The open mode flags.

Calls std::basic_filebuf::open(__s,__mode). If that function fails, failbit is set in the stream's error state.

Definition at line 1218 of file fstream.

template<typename _CharT , typename _Traits > __filebuf_type* std::basic_fstream< _CharT, _Traits >::rdbuf () const [inline]

Accessing the underlying buffer.

Returns

The current basic_filebuf buffer.

This hides both signatures of std::basic_ios::rdbuf().

Definition at line 1151 of file fstream.

Author

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Tue Jul 14 2020 libstdc++