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std::basic_ostream::operator=

De cppreference.com
< cpp‎ | io‎ | basic ostream

 
 
D'entrée / sortie de bibliothèque
I / O manipulateurs
C-style I / O
Tampons
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Buffers
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basic_streambuf
basic_filebuf
basic_stringbuf
strstreambuf (obsolète)
Cours d'eau
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Streams
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Abstractions
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ios_base
basic_ios
basic_istream
basic_ostream
basic_iostream
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File I/O
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basic_ifstream
basic_ofstream
basic_fstream
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String I/O
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basic_istringstream
basic_ostringstream
basic_stringstream
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Array I/O
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istrstream (obsolète)
ostrstream (obsolète)
strstream (obsolète)
Types
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Types
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streamoff
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Error category interface
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iostream_category (C++11)
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std::basic_ostream
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basic_ostream::basic_ostream
basic_ostream::~basic_ostream
basic_ostream::operator= (C++11)
Entrée formaté
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Formatted input
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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
Tiers fonctions
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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) (depuis 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.

[modifier] Paramètres

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

[modifier] Exemple

#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';
}

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