[ofstream.members]

# 31 Input/output library [[input.output]](./#input.output)

## 31.10 File-based streams [[file.streams]](file.streams#ofstream.members)

### 31.10.5 Class template basic_ofstream [[ofstream]](ofstream#members)

#### 31.10.5.4 Member functions [ofstream.members]

[🔗](#lib:rdbuf,basic_ofstream)

`basic_filebuf<charT, traits>* rdbuf() const;
`

[1](#1)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iostreams.tex#L12208)

*Returns*: const_cast<basic_filebuf<charT, traits>*>(addressof(*sb*))[.](#1.sentence-1)

[🔗](#lib:native_handle,basic_ofstream)

`native_handle_type native_handle() const noexcept;
`

[2](#2)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iostreams.tex#L12219)

*Effects*: Equivalent to: return rdbuf()->native_handle();

[🔗](#lib:is_open,basic_ofstream)

`bool is_open() const;
`

[3](#3)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iostreams.tex#L12230)

*Returns*: rdbuf()->is_open()[.](#3.sentence-1)

[🔗](#lib:open,basic_ofstream)

`void open(const char* s, ios_base::openmode mode = ios_base::out);
void open(const filesystem::path::value_type* s,
          ios_base::openmode mode = ios_base::out);             // wide systems only; see [[fstream.syn]](fstream.syn "31.10.1 Header <fstream> synopsis")
`

[4](#4)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iostreams.tex#L12243)

*Effects*: Callsrdbuf()->open(s, mode | ios_base​::​out)[.](#4.sentence-1)

If that function does not return a null pointer
calls clear(),
otherwise callssetstate(​failbit) (which may throwios_base​::​failure) ([[iostate.flags]](iostate.flags "31.5.4.4 Flags functions"))[.](#4.sentence-2)

[🔗](#lib:close,basic_ofstream)

`void close();
`

[5](#5)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iostreams.tex#L12261)

*Effects*: Callsrdbuf()->close() and, if that function fails (returns a null pointer), callssetstate(​failbit) (which may throwios_base​::​failure) ([[iostate.flags]](iostate.flags "31.5.4.4 Flags functions"))[.](#5.sentence-1)

[🔗](#lib:open,basic_ofstream_)

`void open(const string& s, ios_base::openmode mode = ios_base::out);
void open(const filesystem::path& s, ios_base::openmode mode = ios_base::out);
`

[6](#6)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iostreams.tex#L12278)

*Effects*: Calls open(s.c_str(), mode)[.](#6.sentence-1)