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std::basic_istream::basic_istream

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< cpp‎ | io‎ | basic istream

 
 
De entrada / saída da biblioteca
I / O manipuladores
C estilo de I / O
Buffers
Original:
Buffers
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basic_streambuf
basic_filebuf
basic_stringbuf
strstreambuf(obsoleta)
Streams
Original:
Streams
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Abstrações
Original:
Abstractions
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ios_base
basic_ios
basic_istream
basic_ostream
basic_iostream
File I / O
Original:
File I/O
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basic_ifstream
basic_ofstream
basic_fstream
Cordas I / O
Original:
String I/O
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basic_istringstream
basic_ostringstream
basic_stringstream
Matriz de I / O
Original:
Array I/O
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istrstream(obsoleta)
ostrstream(obsoleta)
strstream(obsoleta)
Tipos
Original:
Types
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streamoff
streamsize
fpos
Interface de categoria de erro
Original:
Error category interface
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iostream_category(C++11)
io_errc(C++11)
 
std::basic_istream
Objetos globais
Original:
Global objects
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cin
wcin
Funções de membro
Original:
Member functions
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basic_istream::basic_istream
basic_istream::~basic_istream
basic_istream::operator=(C++11)
Entrada formatada
Original:
Formatted input
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basic_istream::operator>>
Entrada não formatado
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
Posicionamento
Original:
Positioning
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basic_istream::tellg
basic_istream::seekg
Diversos
Original:
Miscellaneous
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basic_istream::sync
basic_istream::swap(C++11)
Aulas-Membros
Original:
Member classes
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basic_istream::sentry
Não-membros funções
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) (a partir do 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.
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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.
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[editar] Parâmetros

sb -
streambuffer para usar como dispositivo subjacente
Original:
streambuffer to use as underlying device
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[editar] 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';
}

Output:

hello world