std::basic_fstream::is_open

来自cppreference.com

 
 
输入/输出库
I / O操纵
C-风格的I / O
缓冲区
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Buffers
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basic_streambuf
basic_filebuf
basic_stringbuf
strstreambuf(过时了)
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Streams
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抽象
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Abstractions
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ios_base
basic_ios
basic_istream
basic_ostream
basic_iostream
文件I / O
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File I/O
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basic_ifstream
basic_ofstream
basic_fstream
字符串I / O
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String I/O
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basic_istringstream
basic_ostringstream
basic_stringstream
阵列的I / O
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Array I/O
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istrstream(过时了)
ostrstream(过时了)
strstream(过时了)
类型
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Types
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streamoff
streamsize
fpos
Error类的接口
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Error category interface
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iostream_category(C++11)
io_errc(C++11)
 
std::basic_fstream
成员函数
Original:
Member functions
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basic_fstream::basic_fstream
basic_fstream::operator=(C++11)
basic_fstream::swap(C++11)
basic_fstream::rdbuf
文件操作
Original:
File operations
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basic_fstream::is_open
basic_fstream::open
basic_fstream::close
非成员函数
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Non-member functions
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basic_fstream::swap(std::basic_fstream)(C++11)
 
bool is_open() const;
文件流的检查,如果有一个相关的文件.
Original:
Checks if the file stream has an associated file.
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有效地调用rdbuf()->is_open().
Original:
Effectively calls rdbuf()->is_open().
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目录

[编辑] 参数

(无)
Original:
(none)
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[编辑] 返回值

true如果文件流关联的文件,false其他方式
Original:
true if the file stream has an associated file, false otherwise
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[编辑] 为例

[编辑] 另请参阅

打开一个文件,并将它与数据流
Original:
opens a file and associates it with the stream
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(公共成员函数) [edit]
关闭相关的文件
Original:
closes the associated file
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(公共成员函数) [edit]