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std::basic_ostream::operator=

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< cpp‎ | io‎ | basic ostream

 
 
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I / O manipuladores
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Buffers
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Buffers
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basic_streambuf
basic_filebuf
basic_stringbuf
strstreambuf(obsoleta)
Streams
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Streams
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Abstrações
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ios_base
basic_ios
basic_istream
basic_ostream
basic_iostream
File I / O
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File I/O
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basic_ifstream
basic_ofstream
basic_fstream
Cordas I / O
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basic_istringstream
basic_ostringstream
basic_stringstream
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Array I/O
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istrstream(obsoleta)
ostrstream(obsoleta)
strstream(obsoleta)
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streamoff
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iostream_category(C++11)
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std::basic_ostream
Objetos globais
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basic_ostream::basic_ostream
basic_ostream::~basic_ostream
basic_ostream::operator=(C++11)
Entrada formatada
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basic_ostream::operator<<
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basic_ostream::put
basic_ostream::write
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basic_ostream::tellp
basic_ostream::seekp
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basic_ostream::flush
basic_ostream::swap(C++11)
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basic_ostream::sentry
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operator<<(std::basic_ostream)
 
protected:
basic_istream& operator=( const basic_ostream& rhs ) = delete;
(1)
protected:
basic_ostream& operator=( basic_ostream&& rhs );
(2) (a partir do C++ 11)

1) The copy assignment operator is protected, and is deleted. Output streams are not CopyAssignable.

2) The move assignment operator exchanges all data members of the base class, except for rdbuf(), with rhs, as if by calling swap(*rhs). This move assignment operator is protected: it is only called by the move assignment operators of the derived movable output stream classes std::basic_ofstream and std::basic_ostringstream, which know how to correctly move-assign the associated streambuffers.

[editar] Parâmetros

rhs - the basic_ostream object from which to assign to *this

[editar] Exemplo

#include <sstream>
#include <utility>
#include <iostream>
int main()
{
    std::ostringstream s;
//  std::cout = s;                             // ERROR: copy assignment operator is deleted
//  std::cout = std::move(s);                  // ERROR: move assignment operator is protected
    s = std::move(std::ostringstream() << 42); // OK, moved through derived
    std::cout << s.str() << '\n';
}

Output:

42