Standard library header <istream>
From cppreference.com
This header is part of the input/output library.
Classes |
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wraps a given abstract device (std::basic_streambuf) and provides high-level input interface (class template) |
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std::istream | basic_istream<char> (typedef) |
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std::wistream | basic_istream<wchar_t> (typedef) |
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wraps a given abstract device (std::basic_streambuf) and provides high-level input/output interface (class template) |
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std::iostream | basic_iostream<char> (typedef) |
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std::wiostream | basic_iostream<wchar_t> (typedef) |
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Functions |
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extracts characters and character arrays (function template) |
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Manipulators |
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consumes whitespace (function template) |
[edit] Synopsis
namespace std { template <class charT, class traits = char_traits<charT> > class basic_istream; typedef basic_istream<char> istream; typedef basic_istream<wchar_t> wistream; template <class charT, class traits = char_traits<charT> > class basic_iostream; typedef basic_istream<char> iostream; typedef basic_istream<wchar_t> wiostream; template <class charT, class traits> basic_istream<charT,traits>& ws(basic_istream<charT,traits>& is); template <class charT, class traits, class T> basic_istream<charT, traits>& operator>>(basic_istream<charT, traits>&& is, T& x); // 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> 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*); }
[edit] Class std::basic_istream
template <class charT, class traits = char_traits<charT> > class basic_istream : virtual public basic_ios<charT,traits> { public: // types (inherited from basic_ios): typedef charT char_type; typedef typename traits::int_type int_type; typedef typename traits::pos_type pos_type; typedef typename traits::off_type off_type; typedef traits traits_type; // Constructor/destructor: explicit basic_istream(basic_streambuf<char_type,traits>* sb); virtual ~basic_istream(); // Prefix/suffix: class sentry; // Formatted input: basic_istream<charT,traits>& operator>>( basic_istream<charT,traits>& (*pf)(basic_istream<charT,traits>&)); basic_istream<charT,traits>& operator>>( basic_ios<charT,traits>& (*pf)(basic_ios<charT,traits>&)); basic_istream<charT,traits>& operator>>( ios_base& (*pf)(ios_base&)); basic_istream<charT,traits>& operator>>(bool& n); basic_istream<charT,traits>& operator>>(short& n); basic_istream<charT,traits>& operator>>(unsigned short& n); basic_istream<charT,traits>& operator>>(int& n); basic_istream<charT,traits>& operator>>(unsigned int& n); basic_istream<charT,traits>& operator>>(long& n); basic_istream<charT,traits>& operator>>(unsigned long& n); basic_istream<charT,traits>& operator>>(long long& n); basic_istream<charT,traits>& operator>>(unsigned long long& n); basic_istream<charT,traits>& operator>>(float& f); basic_istream<charT,traits>& operator>>(double& f); basic_istream<charT,traits>& operator>>(long double& f); basic_istream<charT,traits>& operator>>(void*& p); basic_istream<charT,traits>& operator>>( basic_streambuf<char_type,traits>* sb); // Unformatted input: streamsize gcount() const; int_type get(); basic_istream<charT,traits>& get(char_type& c); basic_istream<charT,traits>& get(char_type* s, streamsize n); basic_istream<charT,traits>& get(char_type* s, streamsize n, char_type delim); basic_istream<charT,traits>& get(basic_streambuf<char_type,traits>& sb); basic_istream<charT,traits>& get(basic_streambuf<char_type,traits>& sb, char_type delim); basic_istream<charT,traits>& getline(char_type* s, streamsize n); basic_istream<charT,traits>& getline(char_type* s, streamsize n, char_type delim); basic_istream<charT,traits>& ignore( streamsize n = 1, int_type delim = traits::eof()); int_type peek(); basic_istream<charT,traits>& read (char_type* s, streamsize n); streamsize readsome(char_type* s, streamsize n); basic_istream<charT,traits>& putback(char_type c); basic_istream<charT,traits>& unget(); int sync(); pos_type tellg(); basic_istream<charT,traits>& seekg(pos_type); basic_istream<charT,traits>& seekg(off_type, ios_base::seekdir); protected: basic_istream(const basic_istream& rhs) = delete; basic_istream(basic_istream&& rhs); // Assign/swap: basic_istream& operator=(const basic_istream& rhs) = delete; basic_istream& operator=(basic_istream&& rhs); void swap(basic_istream& rhs); };
[edit] Class std::basic_iostream
template <class charT, class traits = char_traits<charT> > class basic_iostream : public basic_istream<charT,traits>, public basic_ostream<charT,traits> { public: // types typedef charT char_type; typedef typename traits::int_type int_type; typedef typename traits::pos_type pos_type; typedef typename traits::off_type off_type; typedef traits traits_type; // constructor/destructor explicit basic_iostream(basic_streambuf<charT,traits>* sb); virtual ~basic_iostream(); protected: basic_iostream(const basic_iostream& rhs) = delete; basic_iostream(basic_iostream&& rhs); // assign/swap basic_iostream& operator=(const basic_iostream& rhs) = delete; basic_iostream& operator=(basic_iostream&& rhs); void swap(basic_iostream& rhs); };