Archivo de encabezado de la biblioteca estándar <istream>

 

C++

Apoyo de compiladores

Implementaciones independientes y albergadas

Lenguaje

Biblioteca estándar

Encabezados de la biblioteca estándar

Requisitos denominados

Macros de prueba de característica (C++20)

Biblioteca de apoyo del lenguaje

Biblioteca de conceptos (C++20)

Biblioteca de diagnósticos

Biblioteca de gestión de memoria

Biblioteca de metaprogramación (C++11)

Biblioteca de servicios generales

Biblioteca de contenedores

Biblioteca de iteradores

Biblioteca de rangos (C++20)

Biblioteca de algoritmos

Biblioteca de cadenas

Biblioteca de procesamiento de texto

Biblioteca numérica

Biblioteca de fecha y hora

Biblioteca de entrada/salida

Biblioteca del sistema de archivos (C++17)

Biblioteca de apoyo de concurrencia (C++11)

Biblioteca de apoyo de ejecución (C++26)

Especificaciones técnicas

Índice de símbolos

Bibliotecas externas

 

Archivos de encabezado de la biblioteca estándar

Apoyo del lenguaje <cfloat> <climits> <compare> (C++20) <coroutine> (C++20) <csetjmp> <csignal> <cstdarg> <cstddef> <cstdint> (C++11) <cstdlib> <exception> <initializer_list> (C++11)    <limits> <new> <source_location> (C++20) <stdfloat> (C++23) <typeinfo> <version> (C++20) Conceptos <concepts> (C++20) Diagnósticos <cassert> <cerrno> <debugging> (C++26) <stacktrace> (C++23) <stdexcept> <system_error> (C++11) Gestión de memoria <memory> <memory_resource> (C++17) <scoped_allocator> (C++11) Metaprogramación <type_traits> (C++11) <ratio> (C++11)

Servicios generales <any> (C++17) <bitset> <bit> (C++20) <charconv> (C++17) <expected> (C++23) <format> (C++20) <functional> <optional> (C++17) <tuple> (C++11) <typeindex> (C++11) <utility> <variant> (C++17) Contenedores <array> (C++11) <deque> <flat_map> (C++23) <flat_set> (C++23) <forward_list> (C++11) <inplace_vector> (C++26)    <list> <map> <mdspan> (C++23) <queue> <set> <span> (C++20) <stack> <unordered_map> (C++11) <unordered_set> (C++11) <vector> Iteradores <iterator> Rangos <generator> (C++23) <ranges> (C++20)

Algoritmos <algorithm> <numeric> Cadenas <cctype> <cstring> <cuchar> (C++11) <cwchar> <cwctype> <string_view> (C++17) <string> Procesamiento de texto <clocale> <codecvt> (C++11/17/26*) <locale> <regex> (C++11) <text_encoding> (C++26)    Numéricos <cfenv> (C++11) <cmath> <complex> <linalg> (C++26) <numbers> (C++20) <random> (C++11) <simd> (C++26) <valarray> Tiempo <chrono> (C++11) <ctime> Compatibilidad con C <ccomplex> (C++11/17/20*) <ciso646> (hasta C++20) <cstdalign> (C++11/17/20*) <cstdbool> (C++11/17/20*) <ctgmath> (C++11/17/20*)

Entrada/Salida <cinttypes> (C++11) <cstdio> <filesystem> (C++17) <fstream> <iomanip> <iosfwd> <iostream> <ios> <istream> <ostream> <print> (C++23) <spanstream> (C++23) <sstream> <streambuf> <strstream> (C++98/26*) <syncstream> (C++20) Apoyo para concurrencia <atomic> (C++11) <barrier> (C++20) <condition_variable> (C++11) <future> (C++11) <hazard_pointer> (C++26) <latch> (C++20) <mutex> (C++11) <rcu> (C++26) <semaphore> (C++20) <shared_mutex> (C++14) <stdatomic.h> (C++23) <stop_token> (C++20) <thread> (C++11) Apoyo de ejecución <execution> (C++17)

 

See More

Este archivo de encabezado es parte de la biblioteca de Entrada/Salida.

Clases
basic_istream	Envuelve un dispositivo abstracto dado (std::basic_streambuf) y proporciona una interfaz de entrada de alto nivel. (plantilla de clase)
std::istream	std::basic_istream<char> (typedef)
std::wistream	std::basic_istream<wchar_t> (typedef)
basic_iostream	Envuelve un dispositivo abstracto dado (std::basic_streambuf) y proporciona una interfaz de entrada/salida de alto nivel. (plantilla de clase)
std::iostream	std::basic_iostream<char> (typedef)
std::wiostream	std::basic_iostream<wchar_t> (typedef)
Funciones
operator>>(std::basic_istream)	extrae caracteres y matrices de caracteres (plantilla de función)
Manipuladores
ws	consume espacio en blanco Original: consumes whitespace The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (plantilla de función)

Sinopsis

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);
}

Plantilla de clase std::basic_istream

namespace std {
  template<class CharT, class Traits = char_traits<CharT>>
  class basic_istream : virtual public basic_ios<CharT, Traits> {
  public:
    // tipos (heredados 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;

    // constructor/destructor
    explicit basic_istream(basic_streambuf<CharT, Traits>* sb);
    virtual ~basic_istream();

    // prefijo/sufijo
    class sentry;

    // entrada formateada
    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);

    // entrada no formateada
    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:
    // constructor de copia/movimiento
    basic_istream(const basic_istream&) = delete;
    basic_istream(basic_istream&& rhs);

    // asignación e intercambio
    basic_istream& operator=(const basic_istream&) = delete;
    basic_istream& operator=(basic_istream&& rhs);
    void swap(basic_istream& rhs);
  };

  // plantillas de extracción de caracteres
  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]);
}

Clase std::basic_istream::sentry

namespace std {
  template<class CharT, class Traits = char_traits<CharT>>
  class basic_istream<CharT, Traits>::sentry {
    bool ok_;                   // exposition only
  public:
    explicit sentry(basic_istream<CharT, Traits>& is, bool noskipws = false);
    ~sentry();
    explicit operator bool() const { return ok_; }
    sentry(const sentry&) = delete;
    sentry& operator=(const sentry&) = delete;
  };
}

Plantilla de clase 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);

    // asignación e intercambio
    basic_iostream& operator=(const basic_iostream&) = delete;
    basic_iostream& operator=(basic_iostream&& rhs);
    void swap(basic_iostream& rhs);
  };
}