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Leonov Artur (Depish)
2025-10-25 03:02:53 +03:00
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[fstream.cons]
# 31 Input/output library [[input.output]](./#input.output)
## 31.10 File-based streams [[file.streams]](file.streams#fstream.cons)
### 31.10.6 Class template basic_fstream [[fstream]](fstream#cons)
#### 31.10.6.2 Constructors [fstream.cons]
[🔗](#lib:basic_fstream,constructor)
`basic_fstream();
`
[1](#1)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iostreams.tex#L12369)
*Effects*: Initializes the base class withbasic_iostream<charT, traits>(addressof(*sb*)) ([[iostream.cons]](iostream.cons "31.7.5.7.2 Constructors"))
and*sb* with basic_filebuf<charT, traits>()[.](#1.sentence-1)
[🔗](#lib:basic_fstream,constructor_)
`explicit basic_fstream(
const char* s,
ios_base::openmode mode = ios_base::in | ios_base::out);
explicit basic_fstream(
const filesystem::path::value_type* s,
ios_base::openmode mode = ios_base::in | 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#L12388)
*Effects*: Initializes the base class withbasic_iostream<charT, traits>(addressof(*sb*)) ([[iostream.cons]](iostream.cons "31.7.5.7.2 Constructors"))
and*sb* with basic_filebuf<charT, traits>()[.](#2.sentence-1)
Then callsrdbuf()->open(s, mode)[.](#2.sentence-2)
If that function returns a null pointer, callssetstate(failbit)[.](#2.sentence-3)
[🔗](#lib:basic_fstream,constructor__)
`explicit basic_fstream(
const string& s,
ios_base::openmode mode = ios_base::in | ios_base::out);
`
[3](#3)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iostreams.tex#L12408)
*Effects*: Equivalent to basic_fstream(s.c_str(), mode)[.](#3.sentence-1)
[🔗](#lib:basic_fstream,constructor___)
`template<class T>
explicit basic_fstream(const T& s, ios_base::openmode mode = ios_base::in | ios_base::out);
`
[4](#4)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iostreams.tex#L12420)
*Constraints*: is_same_v<T, filesystem​::​path> is true[.](#4.sentence-1)
[5](#5)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iostreams.tex#L12424)
*Effects*: Equivalent to basic_fstream(s.c_str(), mode)[.](#5.sentence-1)
[🔗](#lib:basic_fstream,constructor____)
`basic_fstream(basic_fstream&& rhs);
`
[6](#6)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iostreams.tex#L12435)
*Effects*: Move constructs the base class, and the contained basic_filebuf[.](#6.sentence-1)
Then calls basic_istream<charT, traits>​::​set_rdbuf(​addressof(*sb*)) to install the contained basic_filebuf[.](#6.sentence-2)