how to put std::string into boost::lockfree::queue (or alternative)?
I'm trying to put std::strings into boost::lockfree::queues so that my threads can update each other with new data.
When I try to use boost::lockfree::queue<std::string> updated_data;, g++ says :
In instantiation of 'class boost::lockfree::queue >':
error: static assertion failed: (boost::has_trivial_destructor::value)
error: static assertion failed: (boost::has_trivial_assign::value)
I've been shown generally what these errors mean, but I have no hope of ever fixing this myself, as I'm almost brand new to c++.
Is there an alternative way to pass text data between threads with lockfree? If not, please show me how to put std::string into a boost::lockfree::queue.
Answer
The boost::lockfree::queue documentation clearly states the the contained itemm must have a trivial copy assignment and destructor, which std::string doesn't have.
If you have a single producer and a single consumer you can use spsc_queue (http://www.boost.org/doc/libs/1_54_0/doc/html/boost/lockfree/spsc_queue.html) which requires only default constructability and copyability.
If you have multiple producers or consumers you're going to be stuck with a normal locking queue (or a custom string that doesn't use dynamic allocation).