标准库头文件 <istream>
来自 cppreference.com
此头文件是 输入/输出 库的一部分。
类 | ||
包装给定抽象设备 (std::basic_streambuf) 并提供高级输入接口 (类模板) | ||
std::istream | std::basic_istream<char> (typedef) | |
std::wistream | std::basic_istream<wchar_t> (typedef) | |
包装给定抽象设备 (std::basic_streambuf) 并提供高级输入/输出接口 (类模板) | ||
std::iostream | std::basic_iostream<char> (typedef) | |
std::wiostream | std::basic_iostream<wchar_t> (typedef) | |
函数 | ||
提取字符和字符数组 (函数模板) | ||
操纵符 | ||
消耗空白符 (函数模板) |
[编辑] 概要
namespace std { template<class CharT, class Traits = char_traits<CharT>> class basic_istream; using istream = basic_istream<char>; using wistream = basic_istream<wchar_t>; template<class CharT, class Traits = char_traits<CharT>> class basic_iostream; using iostream = basic_iostream<char>; using wiostream = basic_iostream<wchar_t>; template<class CharT, class Traits> basic_istream<CharT, Traits>& ws(basic_istream<CharT, Traits>& is); template<class Istream, class T> Istream&& operator>>(Istream&& is, T&& x); }
[编辑] 类模板 std::basic_istream
namespace std { template<class CharT, class Traits = char_traits<CharT>> class basic_istream : virtual public basic_ios<CharT, Traits> { public: // types (inherited from basic_ios) 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; // constructor/destructor explicit basic_istream(basic_streambuf<CharT, Traits>* sb); virtual ~basic_istream(); // prefix/suffix class sentry; // formatted input basic_istream& operator>>(basic_istream& (*pf)(basic_istream&)); basic_istream& operator>>(basic_ios<CharT, Traits>& (*pf)(basic_ios<CharT, Traits>&)); basic_istream& operator>>(ios_base& (*pf)(ios_base&)); basic_istream& operator>>(bool& n); basic_istream& operator>>(short& n); basic_istream& operator>>(unsigned short& n); basic_istream& operator>>(int& n); basic_istream& operator>>(unsigned int& n); basic_istream& operator>>(long& n); basic_istream& operator>>(unsigned long& n); basic_istream& operator>>(long long& n); basic_istream& operator>>(unsigned long long& n); basic_istream& operator>>(float& f); basic_istream& operator>>(double& f); basic_istream& operator>>(long double& f); basic_istream& operator>>(/*extended-floating-point-type*/& f); basic_istream& operator>>(void*& p); basic_istream& operator>>(basic_streambuf<char_type, Traits>* sb); // unformatted input streamsize gcount() const; int_type get(); basic_istream& get(char_type& c); basic_istream& get(char_type* s, streamsize n); basic_istream& get(char_type* s, streamsize n, char_type delim); basic_istream& get(basic_streambuf<char_type, Traits>& sb); basic_istream& get(basic_streambuf<char_type, Traits>& sb, char_type delim); basic_istream& getline(char_type* s, streamsize n); basic_istream& getline(char_type* s, streamsize n, char_type delim); basic_istream& ignore(streamsize n = 1, int_type delim = Traits::eof()); int_type peek(); basic_istream& read (char_type* s, streamsize n); streamsize readsome(char_type* s, streamsize n); basic_istream& putback(char_type c); basic_istream& unget(); int sync(); pos_type tellg(); basic_istream& seekg(pos_type); basic_istream& seekg(off_type, ios_base::seekdir); protected: // copy/move constructor basic_istream(const basic_istream&) = delete; basic_istream(basic_istream&& rhs); // assignment and swap basic_istream& operator=(const basic_istream&) = delete; basic_istream& operator=(basic_istream&& rhs); void swap(basic_istream& rhs); }; // character extraction templates template<class CharT, class Traits> basic_istream<CharT, Traits>& operator>>(basic_istream<CharT, Traits>&, CharT&); template<class Traits> basic_istream<char, Traits>& operator>>(basic_istream<char, Traits>&, unsigned char&); template<class Traits> basic_istream<char, Traits>& operator>>(basic_istream<char, Traits>&, signed char&); template<class CharT, class Traits, size_t N> basic_istream<CharT, Traits>& operator>>(basic_istream<CharT, Traits>&, CharT(&)[N]); template<class Traits, size_t N> basic_istream<char, Traits>& operator>>(basic_istream<char, Traits>&, unsigned char(&)[N]); template<class Traits, size_t N> basic_istream<char, Traits>& operator>>(basic_istream<char, Traits>&, signed char(&)[N]); }
[编辑] 类 std::basic_istream::sentry
namespace std { template<class CharT, class Traits> class basic_istream<CharT, Traits>::sentry { bool ok_; // exposition only public: explicit sentry(basic_istream& is, bool noskipws = false); ~sentry(); explicit operator bool() const { return ok_; } sentry(const sentry&) = delete; sentry& operator=(const sentry&) = delete; }; }
[编辑] 类模板 std::basic_iostream
namespace std { template<class CharT, class Traits = char_traits<CharT>> class basic_iostream : public basic_istream<CharT, Traits>, public basic_ostream<CharT, Traits> { 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; // constructor explicit basic_iostream(basic_streambuf<CharT, Traits>* sb); // destructor virtual ~basic_iostream(); protected: // constructor basic_iostream(const basic_iostream&) = delete; basic_iostream(basic_iostream&& rhs); // assignment and swap basic_iostream& operator=(const basic_iostream&) = delete; basic_iostream& operator=(basic_iostream&& rhs); void swap(basic_iostream& rhs); }; }