69 lines
2.2 KiB
Markdown
69 lines
2.2 KiB
Markdown
[syncstream.syncbuf.assign]
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# 31 Input/output library [[input.output]](./#input.output)
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## 31.11 Synchronized output streams [[syncstream]](syncstream#syncbuf.assign)
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### 31.11.2 Class template basic_syncbuf [[syncstream.syncbuf]](syncstream.syncbuf#assign)
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#### 31.11.2.3 Assignment and swap [syncstream.syncbuf.assign]
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[ð](#lib:operator=,basic_syncbuf)
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`basic_syncbuf& operator=(basic_syncbuf&& rhs);
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`
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[1](#1)
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[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iostreams.tex#L12742)
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*Effects*: Calls emit() then
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move assigns from rhs[.](#1.sentence-1)
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After the move assignment *this has the observable state it would have had if
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it had been move constructed from rhs ([[syncstream.syncbuf.cons]](syncstream.syncbuf.cons "31.11.2.2 Construction and destruction"))[.](#1.sentence-2)
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[2](#2)
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[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iostreams.tex#L12750)
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*Postconditions*:
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- [(2.1)](#2.1)
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rhs.get_wrapped() == nullptr is true.
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- [(2.2)](#2.2)
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this->get_allocator() == rhs.get_allocator() is true whenallocator_traits<Allocator>::propagate_on_container_move_assignment::value is true; otherwise, the allocator is unchanged.
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[3](#3)
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[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iostreams.tex#L12763)
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*Returns*: *this[.](#3.sentence-1)
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[4](#4)
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[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iostreams.tex#L12767)
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*Remarks*: This assignment operator disassociates rhs from its wrapped stream buffer,
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ensuring destruction of rhs produces no output[.](#4.sentence-1)
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[ð](#lib:swap,basic_syncbuf)
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`void swap(basic_syncbuf& other);
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`
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[5](#5)
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[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iostreams.tex#L12780)
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*Preconditions*: Eitherallocator_traits<Allocator>::propagate_on_container_swap::value is true orthis->get_allocator() == other.get_allocator() is true[.](#5.sentence-1)
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[6](#6)
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[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iostreams.tex#L12789)
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*Effects*: Exchanges the state of *this and other[.](#6.sentence-1)
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