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+[ofstream]
+
+# 31 Input/output library [[input.output]](./#input.output)
+
+## 31.10 File-based streams [[file.streams]](file.streams#ofstream)
+
+### 31.10.5 Class template basic_ofstream [ofstream]
+
+#### [31.10.5.1](#general) General [[ofstream.general]](ofstream.general)
+
+[ð](#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]](#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]](#swap "31.10.5.3 Swap"), swapvoid swap(basic_ofstream& rhs); // [[ofstream.members]](#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](#general-1)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iostreams.tex#L12080)
+
+The classbasic_ofstream<charT, traits> supports writing to named files[.](#general-1.sentence-1)
+
+It uses abasic_filebuf<charT, traits> object to control the associated
+sequence[.](#general-1.sentence-2)
+
+For the sake of exposition, the maintained data is presented here as:
+
+- [(1.1)](#general-1.1)
+
+*sb*, the filebuf object[.](#general-1.sentence-3)
+
+#### [31.10.5.2](#cons) Constructors [[ofstream.cons]](ofstream.cons)
+
+[ð](#lib:basic_ofstream,constructor)
+
+`basic_ofstream();
+`
+
+[1](#cons-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"))[.](#cons-1.sentence-1)
+
+[ð](#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](#cons-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)[.](#cons-2.sentence-1)
+
+If that function returns a null pointer, callssetstate(failbit)[.](#cons-2.sentence-2)
+
+[ð](#lib:basic_ofstream,constructor__)
+
+`explicit basic_ofstream(const string& s,
+                        ios_base::openmode mode = ios_base::out);
+`
+
+[3](#cons-3)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iostreams.tex#L12138)
+
+*Effects*: Equivalent to basic_ofstream(s.c_str(), mode)[.](#cons-3.sentence-1)
+
+[ð](#lib:basic_ofstream,constructor___)
+
+`template<class T>
+  explicit basic_ofstream(const T& s, ios_base::openmode mode = ios_base::out);
+`
+
+[4](#cons-4)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iostreams.tex#L12150)
+
+*Constraints*: is_same_v<T, filesystem::path> is true[.](#cons-4.sentence-1)
+
+[5](#cons-5)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iostreams.tex#L12154)
+
+*Effects*: Equivalent to basic_ofstream(s.c_str(), mode)[.](#cons-5.sentence-1)
+
+[ð](#lib:basic_ofstream,constructor____)
+
+`basic_ofstream(basic_ofstream&& rhs);
+`
+
+[6](#cons-6)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iostreams.tex#L12165)
+
+*Effects*: Move constructs the base class, and the contained basic_filebuf[.](#cons-6.sentence-1)
+
+Then calls basic_ostream<charT, traits>::set_rdbuf(addressof(*sb*)) to install the contained basic_filebuf[.](#cons-6.sentence-2)
+
+#### [31.10.5.3](#swap) Swap [[ofstream.swap]](ofstream.swap)
+
+[ð](#lib:swap,basic_ofstream)
+
+`void swap(basic_ofstream& rhs);
+`
+
+[1](#swap-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*)[.](#swap-1.sentence-1)
+
+[ð](#lib:swap,basic_ofstream_)
+
+`template<class charT, class traits>
+  void swap(basic_ofstream<charT, traits>& x, basic_ofstream<charT, traits>& y);
+`
+
+[2](#swap-2)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iostreams.tex#L12195)
+
+*Effects*: Equivalent to x.swap(y)[.](#swap-2.sentence-1)
+
+#### [31.10.5.4](#members) Member functions [[ofstream.members]](ofstream.members)
+
+[ð](#lib:rdbuf,basic_ofstream)
+
+`basic_filebuf<charT, traits>* rdbuf() const;
+`
+
+[1](#members-1)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iostreams.tex#L12208)
+
+*Returns*: const_cast<basic_filebuf<charT, traits>*>(addressof(*sb*))[.](#members-1.sentence-1)
+
+[ð](#lib:native_handle,basic_ofstream)
+
+`native_handle_type native_handle() const noexcept;
+`
+
+[2](#members-2)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iostreams.tex#L12219)
+
+*Effects*: Equivalent to: return rdbuf()->native_handle();
+
+[ð](#lib:is_open,basic_ofstream)
+
+`bool is_open() const;
+`
+
+[3](#members-3)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iostreams.tex#L12230)
+
+*Returns*: rdbuf()->is_open()[.](#members-3.sentence-1)
+
+[ð](#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](#members-4)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iostreams.tex#L12243)
+
+*Effects*: Callsrdbuf()->open(s, mode | ios_base::out)[.](#members-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"))[.](#members-4.sentence-2)
+
+[ð](#lib:close,basic_ofstream)
+
+`void close();
+`
+
+[5](#members-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"))[.](#members-5.sentence-1)
+
+[ð](#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](#members-6)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iostreams.tex#L12278)
+
+*Effects*: Calls open(s.c_str(), mode)[.](#members-6.sentence-1)