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Leonov Artur (Depish)
2025-10-25 03:02:53 +03:00
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[ifstream.members]
# 31 Input/output library [[input.output]](./#input.output)
## 31.10 File-based streams [[file.streams]](file.streams#ifstream.members)
### 31.10.4 Class template basic_ifstream [[ifstream]](ifstream#members)
#### 31.10.4.4 Member functions [ifstream.members]
[🔗](#lib:rdbuf,basic_ifstream)
`basic_filebuf<charT, traits>* rdbuf() const;
`
[1](#1)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iostreams.tex#L11949)
*Returns*: const_cast<basic_filebuf<charT, traits>*>(addressof(*sb*))[.](#1.sentence-1)
[🔗](#lib:native_handle,basic_ifstream)
`native_handle_type native_handle() const noexcept;
`
[2](#2)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iostreams.tex#L11960)
*Effects*: Equivalent to: return rdbuf()->native_handle();
[🔗](#lib:is_open,basic_ifstream)
`bool is_open() const;
`
[3](#3)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iostreams.tex#L11971)
*Returns*: rdbuf()->is_open()[.](#3.sentence-1)
[🔗](#lib:open,basic_ifstream)
`void open(const char* s, ios_base::openmode mode = ios_base::in);
void open(const filesystem::path::value_type* s,
ios_base::openmode mode = ios_base::in); // 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#L11984)
*Effects*: Callsrdbuf()->open(s, mode | ios_base​::​in)[.](#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:open,basic_ifstream_)
`void open(const string& s, ios_base::openmode mode = ios_base::in);
void open(const filesystem::path& s, ios_base::openmode mode = ios_base::in);
`
[5](#5)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iostreams.tex#L12003)
*Effects*: Calls open(s.c_str(), mode)[.](#5.sentence-1)
[🔗](#lib:close,basic_ifstream)
`void close();
`
[6](#6)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iostreams.tex#L12014)
*Effects*: Callsrdbuf()->close() and, if that function returns
a null pointer,
callssetstate(failbit) (which may throwios_base​::​failure) ([[iostate.flags]](iostate.flags "31.5.4.4 Flags functions"))[.](#6.sentence-1)