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) | (desde C++11) |
1)
Constrói o objeto
basic_istream, atribuindo valores iniciais para a classe base chamando basic_ios::init(sb). O valor da gcount() é inicializado 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)
O construtor de cópia é protegida, e é excluído. Fluxos de entrada não são copiáveis .
Original:
The copy constructor is protected, and is deleted. Input streams are not copyable.
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3)
O construtor movimento copia o valor de
gcount() de rhs, define o gcount () o valor de rhs a zero, e usa basic_ios<charT, traits>::move(rhs) para mover todos os membros basic_ios, exceto para o rdbuf(), de rhs em *this. Esse construtor movimento é protegido: ele é chamado pelos construtores movimento de classes de fluxo de entrada móveis std::basic_ifstream e std::basic_istringstream, que sabe como mover corretamente o streambuffer associado.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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Parâmetros
| sb | - | streambuffer para usar como dispositivo subjacente
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. |
Exemplo
#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';
}
Saída:
hello world