标准库头文件 <streambuf>
来自 cppreference.com
此头文件是 输入/输出 库的一部分。
类 | ||
抽象一个原始设备 (类模板) | ||
streambuf
|
std::basic_streambuf<char> (typedef) | |
wstreambuf
|
std::basic_streambuf<wchar_t> (typedef) |
[编辑] 提要
namespace std { template<class CharT, class Traits = char_traits<CharT>> class basic_streambuf; using streambuf = basic_streambuf<char>; using wstreambuf = basic_streambuf<wchar_t>; }
[编辑] 类模板 std::basic_streambuf
namespace std { template<class CharT, class Traits = char_traits<CharT>> class basic_streambuf { public: using char_type = CharT; using int_type = typename Traits::int_type; using pos_type = typename Traits::pos_type; using off_type = typename Traits::off_type; using traits_type = Traits; virtual ~basic_streambuf(); // locales locale pubimbue(const locale& loc); locale getloc() const; // buffer and positioning basic_streambuf* pubsetbuf(char_type* s, streamsize n); pos_type pubseekoff(off_type off, ios_base::seekdir way, ios_base::openmode which = ios_base::in | ios_base::out); pos_type pubseekpos(pos_type sp, ios_base::openmode which = ios_base::in | ios_base::out); int pubsync(); // get and put areas // get area streamsize in_avail(); int_type snextc(); int_type sbumpc(); int_type sgetc(); streamsize sgetn(char_type* s, streamsize n); // putback int_type sputbackc(char_type c); int_type sungetc(); // put area int_type sputc(char_type c); streamsize sputn(const char_type* s, streamsize n); protected: basic_streambuf(); basic_streambuf(const basic_streambuf& rhs); basic_streambuf& operator=(const basic_streambuf& rhs); void swap(basic_streambuf& rhs); // get area access char_type* eback() const; char_type* gptr() const; char_type* egptr() const; void gbump(int n); void setg(char_type* gbeg, char_type* gnext, char_type* gend); // put area access char_type* pbase() const; char_type* pptr() const; char_type* epptr() const; void pbump(int n); void setp(char_type* pbeg, char_type* pend); // virtual functions // locales virtual void imbue(const locale& loc); // buffer management and positioning virtual basic_streambuf* setbuf(char_type* s, streamsize n); virtual pos_type seekoff(off_type off, ios_base::seekdir way, ios_base::openmode which = ios_base::in | ios_base::out); virtual pos_type seekpos(pos_type sp, ios_base::openmode which = ios_base::in | ios_base::out); virtual int sync(); // get area virtual streamsize showmanyc(); virtual streamsize xsgetn(char_type* s, streamsize n); virtual int_type underflow(); virtual int_type uflow(); // putback virtual int_type pbackfail(int_type c = Traits::eof()); // put area virtual streamsize xsputn(const char_type* s, streamsize n); virtual int_type overflow(int_type c = Traits::eof()); }; }
[编辑] 缺陷报告
以下行为改变缺陷报告被追溯地应用于之前发布的 C++ 标准。
DR | 应用于 | 已发布的行为 | 正确行为 |
---|---|---|---|
LWG 56 | C++98 | showmanyc 的返回类型在概要中是 int |
更正为 streamsize |