std::basic_osyncstream<CharT,Traits,Allocator>::operator=
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< cpp | io | basic osyncstream
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std::basic_osyncstream
Public member functions
basic_osyncstream::operator=
(C++20)
(C++20)
(C++20)
(C++20)
basic_osyncstream& operator=( std::basic_osyncstream && other );
(since C++20)
Move-assigns a synchronized output stream:
Move-assigns the wrapped std::basic_syncbuf from the corresponding member of other (after this move-assignment, other.get_wrapped() returns a null pointer and destruction of other produces no output; any pending buffered output will be emitted) and move-assigns the base std::basic_ostream (this swaps all stream state variables except for rdbuf between *this and other)
[edit] Parameters
other
-
another synchronized output stream to move from
[edit] Return value
*this
[edit] Example
Run this code
#include <iomanip> #include <iostream> #include <sstream> #include <syncstream> #include <utility> int main() { std::osyncstream out(std::cout ); out << "test\n"; std::ostringstream str_out; std::osyncstream {str_out} = std::move(out); // Note that out is emitted here std::cout << "str_out = " << std::quoted (str_out.view()) << '\n'; }
Output:
test str_out = ""
[edit] Defect reports
The following behavior-changing defect reports were applied retroactively to previously published C++ standards.
| DR | Applied to | Behavior as published | Correct behavior |
|---|---|---|---|
| LWG 3867 | C++20 | the move assignment operator was noexcept, but std::basic_syncbuf's move assignment operator is not |
removed noexcept |