std::basic_istream::basic_istream
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<metanoindex/>
<tbody> </tbody> 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) | (dal C++11) |
1)
Costruisce l'oggetto
basic_istream, l'assegnazione di valori iniziali per la classe base chiamando basic_ios::init(sb). Il valore di gcount() viene inizializzato a zero.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.The text has been machine-translated via Google Translate.
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2)
Il costruttore di copia è protetto, e viene eliminato. Flussi di ingresso non sono copiabili.
Original:
The copy constructor is protected, and is deleted. Input streams are not copyable.
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3)
Il costruttore mossa copia il valore di
gcount() da rhs, imposta il gcount () valore sd a zero, e usa basic_ios<charT, traits>::move(rhs) per spostare tutti i membri basic_ios, fatta eccezione per la rdbuf(), da rhs in *this. Questo costruttore mossa è protetta: viene chiamato dai costruttori movimento delle classi mobili flusso di input e std::basic_ifstream std::basic_istringstream, che sa come muoversi correttamente il streambuffer associato.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.The text has been machine-translated via Google Translate.
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Parametri
| sb | - | streambuffer da usare come dispositivo sottostante
Original: streambuffer to use as underlying device The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
Esempio
#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