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std::basic_istream::basic_istream

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< cpp‎ | io‎ | basic istream

 
 
Input / Output-Bibliothek
I / O-Manipulatoren
C-style I / O
Puffern
Original:
Buffers
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basic_streambuf
basic_filebuf
basic_stringbuf
strstreambuf(veraltet)
Streams
Original:
Streams
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Abstraktionen
Original:
Abstractions
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ios_base
basic_ios
basic_istream
basic_ostream
basic_iostream
Datei-I / O
Original:
File I/O
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basic_ifstream
basic_ofstream
basic_fstream
String I / O
Original:
String I/O
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basic_istringstream
basic_ostringstream
basic_stringstream
Array I / O
Original:
Array I/O
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istrstream(veraltet)
ostrstream(veraltet)
strstream(veraltet)
Types
Original:
Types
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streamoff
streamsize
fpos
Fehler Kategorie Schnittstelle
Original:
Error category interface
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iostream_category(C++11)
io_errc(C++11)
 
std::basic_istream
Globale Objekte
Original:
Global objects
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cin
wcin
Member-Funktionen
Original:
Member functions
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basic_istream::basic_istream
basic_istream::~basic_istream
basic_istream::operator=(C++11)
Formatierte Eingabe
Original:
Formatted input
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basic_istream::operator>>
Unformatierte Eingabe
Original:
Unformatted input
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basic_istream::get
basic_istream::peek
basic_istream::unget
basic_istream::putback
basic_istream::getline
basic_istream::ignore
basic_istream::read
basic_istream::readsome
basic_istream::gcount
Positionierung
Original:
Positioning
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basic_istream::tellg
basic_istream::seekg
Verschiedenes
Original:
Miscellaneous
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basic_istream::sync
basic_istream::swap(C++11)
Mitglied Klassen
Original:
Member classes
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basic_istream::sentry
Non-Member-Funktionen
Original:
Non-member functions
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operator>>(std::basic_istream)
 
explicit basic_istream( std::basic_streambuf<CharT,Traits>* sb);
(1)
protected:
basic_istream( const basic_istream& rhs ) = delete;
(2)
protected:
basic_istream( basic_istream&& rhs );
(3) (seit C++11)
1)
Konstruiert den basic_istream Objekt zuweisen Startwerte der Basisklasse durch Aufruf basic_ios::init(sb). Der Wert gcount() auf Null initialisiert .
Original:
Constructs the basic_istream object, assigning initial values to the base class by calling basic_ios::init(sb). The value of gcount() is initialized to zero.
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2)
Der Copy-Konstruktor ist geschützt, und wird gelöscht. Input-Streams sind nicht kopierbar .
Original:
The copy constructor is protected, and is deleted. Input streams are not copyable.
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3)
Der Schritt Konstruktor kopiert den Wert von gcount() rhs setzt der gcount () Wert RS auf Null, und verwendet, um alle basic_ios<charT, traits>::move(rhs) basic_ios Mitglieder bewegen, mit Ausnahme der rdbuf() aus rhs in *this. Dieser Schritt Konstruktor geschützt ist: es wird durch die Bewegung Konstruktoren von beweglichen Input-Stream-Klassen aufgerufen std::basic_ifstream und std::basic_istringstream, die wissen, wie man richtig zu bewegen das zugehörige streambuffer .
Original:
The move constructor copies the value of gcount() from rhs, sets the gcount() value of rhs to zero, and uses basic_ios<charT, traits>::move(rhs) to move all basic_ios members, except for the rdbuf(), from rhs into *this. This move constructor is protected: it is called by the move constructors of movable input stream classes std::basic_ifstream and std::basic_istringstream, which know how to correctly move the associated streambuffer.
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[Bearbeiten] Parameter

sb -
streambuffer als zugrunde liegende Gerät verwenden
Original:
streambuffer to use as underlying device
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[Bearbeiten] Beispiel

#include <sstream>
#include <iostream>
int main()
{
    std::istringstream s1("hello");
    std::istream s2(s1.rdbuf());                        // OK: s2 shares the buffer with s1
 
//    std::istream s3(std::istringstream("test"));      // ERROR: move constructor is protected
//    std::istream s4(s2);                              // ERROR: copy constructor is deleted
    std::istringstream s5(std::istringstream("world")); // OK: move ctor called by derived class
 
    std::cout << s2.rdbuf() << ' ' << s5.rdbuf() << '\n';
}

Output:

hello world