CODEWITHSUNDEEP
c++multithreadingc++11move-semanticsassignment-operator
Kolyunya
Kolyunya

Reputation: 6230

Moving std::thread

Trying the make simple piece of code work:

std::thread threadFoo;

std::thread&& threadBar = std::thread(threadFunction);

threadFoo = threadBar; // thread& operator=( thread&& other ); expected to be called

Getting an error:

use of deleted function 'std::thread& std::thread::operator=(const std::thread&)'

I explicitly define threadBar as an rvalue reference, not a ordinary one. Why is not expected operator being called? How do I move one thread to another?

Thank you!

Upvotes: 13

Views: 17113

Answers (2)

Jamie Cruickshank
Jamie Cruickshank

Reputation: 21

See also std::thread::swap. This could be implemented as

std::thread threadFoo;
std::thread threadBar = std::thread(threadFunction);
threadBar.swap(threadFoo);

Upvotes: 2

R. Martinho Fernandes
R. Martinho Fernandes

Reputation: 234384

Named references are lvalues. Lvalues don't bind to rvalue references. You need to use std::move.

threadFoo = std::move(threadBar);

Upvotes: 17

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