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[ofstream.cons]
# 31 Input/output library [[input.output]](./#input.output)
## 31.10 File-based streams [[file.streams]](file.streams#ofstream.cons)
### 31.10.5 Class template basic_ofstream [[ofstream]](ofstream#cons)
#### 31.10.5.2 Constructors [ofstream.cons]
[🔗](#lib:basic_ofstream,constructor)
`basic_ofstream();
`
[1](#1)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iostreams.tex#L12102)
*Effects*: Initializes the base class withbasic_ostream<charT, traits>(addressof(*sb*)) ([[ostream.cons]](ostream.cons "31.7.6.2.2 Constructors"))
and *sb* withbasic_filebuf<charT, traits>() ([[filebuf.cons]](filebuf.cons "31.10.3.2 Constructors"))[.](#1.sentence-1)
[🔗](#lib:basic_ofstream,constructor_)
`explicit basic_ofstream(const char* s,
ios_base::openmode mode = ios_base::out);
explicit basic_ofstream(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")
`
[2](#2)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iostreams.tex#L12119)
*Effects*: Initializes the base class withbasic_ostream<charT, traits>(addressof(*sb*)) ([[ostream.cons]](ostream.cons "31.7.6.2.2 Constructors"))
and *sb* withbasic_filebuf<charT, traits>() ([[filebuf.cons]](filebuf.cons "31.10.3.2 Constructors")),
then callsrdbuf()->open(s, mode | ios_base​::​out)[.](#2.sentence-1)
If that function returns a null pointer, callssetstate(​failbit)[.](#2.sentence-2)
[🔗](#lib:basic_ofstream,constructor__)
`explicit basic_ofstream(const string& s,
ios_base::openmode mode = ios_base::out);
`
[3](#3)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iostreams.tex#L12138)
*Effects*: Equivalent to basic_ofstream(s.c_str(), mode)[.](#3.sentence-1)
[🔗](#lib:basic_ofstream,constructor___)
`template<class T>
explicit basic_ofstream(const T& s, ios_base::openmode mode = ios_base::out);
`
[4](#4)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iostreams.tex#L12150)
*Constraints*: is_same_v<T, filesystem​::​path> is true[.](#4.sentence-1)
[5](#5)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iostreams.tex#L12154)
*Effects*: Equivalent to basic_ofstream(s.c_str(), mode)[.](#5.sentence-1)
[🔗](#lib:basic_ofstream,constructor____)
`basic_ofstream(basic_ofstream&& rhs);
`
[6](#6)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iostreams.tex#L12165)
*Effects*: Move constructs the base class, and the contained basic_filebuf[.](#6.sentence-1)
Then calls basic_ostream<charT, traits>​::​set_rdbuf(​addressof(*sb*)) to install the contained basic_filebuf[.](#6.sentence-2)

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[ofstream.general]
# 31 Input/output library [[input.output]](./#input.output)
## 31.10 File-based streams [[file.streams]](file.streams#ofstream.general)
### 31.10.5 Class template basic_ofstream [[ofstream]](ofstream#general)
#### 31.10.5.1 General [ofstream.general]
[🔗](#lib:basic_ofstream)
namespace std {template<class charT, class traits = char_traits<charT>>class basic_ofstream : public basic_ostream<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; // [[ofstream.cons]](ofstream.cons "31.10.5.2 Constructors"), constructors basic_ofstream(); explicit basic_ofstream(const char* s,
ios_base::openmode mode = ios_base::out); explicit basic_ofstream(const filesystem::path::value_type* s, // wide systems only; see [[fstream.syn]](fstream.syn "31.10.1 Header <fstream> synopsis") ios_base::openmode mode = ios_base::out); explicit basic_ofstream(const string& s,
ios_base::openmode mode = ios_base::out); template<class T>explicit basic_ofstream(const T& s, ios_base::openmode mode = ios_base::out);
basic_ofstream(const basic_ofstream&) = delete;
basic_ofstream(basic_ofstream&& rhs);
basic_ofstream& operator=(const basic_ofstream&) = delete;
basic_ofstream& operator=(basic_ofstream&& rhs); // [[ofstream.swap]](ofstream.swap "31.10.5.3 Swap"), swapvoid swap(basic_ofstream& rhs); // [[ofstream.members]](ofstream.members "31.10.5.4 Member functions"), 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::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")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); void close(); private: basic_filebuf<charT, traits> *sb*; // *exposition only*};}
[1](#1)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iostreams.tex#L12080)
The classbasic_ofstream<charT, traits> supports writing to named files[.](#1.sentence-1)
It uses abasic_filebuf<​charT, traits> object to control the associated
sequence[.](#1.sentence-2)
For the sake of exposition, the maintained data is presented here as:
- [(1.1)](#1.1)
*sb*, the filebuf object[.](#1.sentence-3)

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[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)

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[ofstream.swap]
# 31 Input/output library [[input.output]](./#input.output)
## 31.10 File-based streams [[file.streams]](file.streams#ofstream.swap)
### 31.10.5 Class template basic_ofstream [[ofstream]](ofstream#swap)
#### 31.10.5.3 Swap [ofstream.swap]
[🔗](#lib:swap,basic_ofstream)
`void swap(basic_ofstream& rhs);
`
[1](#1)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iostreams.tex#L12180)
*Effects*: Exchanges the state of *this and rhs by callingbasic_ostream<charT, traits>​::​swap(rhs) and*sb*.swap(rhs.*sb*)[.](#1.sentence-1)
[🔗](#lib:swap,basic_ofstream_)
`template<class charT, class traits>
void swap(basic_ofstream<charT, traits>& x, basic_ofstream<charT, traits>& y);
`
[2](#2)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iostreams.tex#L12195)
*Effects*: Equivalent to x.swap(y)[.](#2.sentence-1)