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Standard library header <istream>

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C++
Standard library headers

Cet en-tête fait partie de la bibliothèque d'entrée/sortie .

Table des matières

Classes

encapsule un dispositif abstrait donné ( std::basic_streambuf )
et fournit une interface d'entrée de haut niveau
(modèle de classe)
std::istream std:: basic_istream < char >
(typedef)
std::wistream std:: basic_istream < wchar_t >
(typedef)
encapsule un dispositif abstrait donné ( std::basic_streambuf )
et fournit une interface d'entrée/sortie de haut niveau
(modèle de classe)
std::iostream std:: basic_iostream < char >
(typedef)
std::wiostream std:: basic_iostream < wchar_t >
(typedef)

Fonctions

extrait des caractères et des tableaux de caractères
(modèle de fonction)
Manipulateurs
consomme les espaces blancs
(modèle de fonction)

Synopsis 

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);
}

Modèle de classe std::basic_istream 

namespace std {
  template<class CharT, class Traits = char_traits<CharT>>
  class basic_istream : virtual public basic_ios<CharT, Traits> {
  public:
    // types (hérités de 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;
    // constructeur/destructeur
    explicit basic_istream(basic_streambuf<CharT, Traits>* sb);
    virtual ~basic_istream();
    // préfixe/suffixe
    class sentry;
    // entrée formatée
    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);
    // entrée non formatée
    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:
    // constructeur de copie/déplacement
    basic_istream(const basic_istream&) = delete;
    basic_istream(basic_istream&& rhs);
    // assignation et échange
    basic_istream& operator=(const basic_istream&) = delete;
    basic_istream& operator=(basic_istream&& rhs);
    void swap(basic_istream& rhs);
  };
  // modèles d'extraction de caractères
  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]);
}

Classe std::basic_istream::sentry 

namespace std {
  template<class CharT, class Traits>
  class basic_istream<CharT, Traits>::sentry {
    bool ok_;                   // exposition uniquement
  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;
  };
}

Modèle de classe 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;
    // constructeur
    explicit basic_iostream(basic_streambuf<CharT, Traits>* sb);
    // destructeur
    virtual ~basic_iostream();
  protected:
    // constructeur
    basic_iostream(const basic_iostream&) = delete;
    basic_iostream(basic_iostream&& rhs);
    // assignation et échange
    basic_iostream& operator=(const basic_iostream&) = delete;
    basic_iostream& operator=(basic_iostream&& rhs);
    void swap(basic_iostream& rhs);
  };
}