C++ å‚考手册
- C++11
- C++14
- C++17
- C++20
- C++ 编译器支æŒæƒ…况表
- 独立与宿主实现
- C++ è¯è¨€
- C++ 关键è¯
- 预处ç†å™¨
- C++ æ ‡å‡†åº“å¤´æ–‡ä»¶
- å…·åè¦æ±‚
- 功能特性测试 (C++20)
- 工具库
- 类型支æŒï¼ˆåŸºæœ¬ç±»åž‹ã€RTTIã€ç±»åž‹ç‰¹æ€§ï¼‰
- 概念库 (C++20)
- 错误处ç†
- 动æ€å†…å˜ç®¡ç†
- 日期和时间工具
- å—符串库
- 容器库
- è¿ä»£å™¨åº“
- 范围库 (C++20)
- 算法库
- 数值库
- 输入/输出库
- 输入/输出æ“纵符
- std::ios_base
- std::ios_base::failure
- std::ios_base::event_callback
- std::ios_base::seekdir
- std::ios_base::event
- std::ios_base::fmtflags
- std::ios_base::iostate
- std::ios_base::iword
- std::ios_base::pword
- std::ios_base::register_callback
- std::ios_base::sync_with_stdio
- std::ios_base::Init
- std::ios_base::openmode
- std::ios_base::precision
- std::ios_base::width
- std::ios_base::imbue
- std::ios_base::getloc
- std::ios_base::xalloc
- std::ios_base::ios_base
- std::ios_base::~ios_base
- std::ios_base::flags
- std::ios_base::setf
- std::ios_base::unsetf
- C é£Žæ ¼æ–‡ä»¶è¾“å…¥/输出
- std::basic_streambuf
- std::basic_filebuf
- std::basic_stringbuf
- std::strstreambuf
- std::basic_syncbuf
- std::basic_ios
- std::basic_istream
- std::basic_osyncstream
- std::basic_ostream
- std::basic_iostream
- std::basic_ifstream
- std::basic_ofstream
- std::basic_fstream
- std::basic_istringstream
- std::basic_ostringstream
- std::basic_stringstream
- std::istrstream
- std::ostrstream
- std::strstream
- std::streamoff
- std::streamsize
- std::fpos
- std::iostream_category
- std::io_errc
- std::cin, std::wcin
- std::cout, std::wcout
- std::cerr, std::wcerr
- std::clog, std::wclog
- 注释
- 文件系统库
- 本地化库
- æ£åˆ™è¡¨è¾¾å¼åº“
- 原åæ“作库
- 线程支æŒåº“
- 实验性 C++ 特性
- 有用的资æº
- 索引
- std 符å·ç´¢å¼•
- åç¨‹æ”¯æŒ (C++20)
- C++ 关键è¯
ä½ç½®ï¼šé¦–页 > C++ å‚考手册 >输入/输出库 >std::ios_base > std::ios_base::openmode
std::ios_base::openmode
| typedef /*implementation defined*/ openmode; |
||
| static constexpr openmode app = /*implementation defined*/ static constexpr openmode binary = /*implementation defined*/ |
||
指定å¯ç”¨çš„æ–‡ä»¶æ‰“å¼€æ ‡å¿—ã€‚å®ƒæ˜¯ä½æŽ©ç 类型 (BitmaskType) ，下列常é‡å¾—到定义：
| Â | |
| å¸¸é‡ | 解释 |
| app | æ¯æ¬¡å†™å…¥å‰å¯»ä½åˆ°æµç»“å°¾ |
| binary | 以二进制模å¼æ‰“å¼€ |
| in | 为读打开 |
| out | 为写打开 |
| trunc | 在打开时èˆå¼ƒæµçš„内容 |
| ate | 打开åŽç«‹å³å¯»ä½åˆ°æµç»“å°¾ |
示例
| æœ¬èŠ‚æœªå®Œæˆ åŽŸå› ï¼šæš‚æ— ç¤ºä¾‹ |
å‚阅
| 打开文件并é…置它为关è”å—符åºåˆ— ( std::basic_filebuf<CharT,Traits> 的公开æˆå‘˜å‡½æ•°) | |
| æž„é€ ä¸€ä¸ª basic_stringbuf 对象 ( std::basic_stringbuf<CharT,Traits,Allocator> 的公开æˆå‘˜å‡½æ•°) |