[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)