Function to dequeue without need for a default constructor about readerwriterqueue HOT 4 CLOSED

Yes, yes it would be possible -- keep in mind, though, that a peek + pop() will always be less efficient than a single try_dequeue (because much of the same logic has to be done twice for both). Obviously, though, there's a valid use case (as you've shown), and the overhead is almost certainly negligible anyway.

I'll implement it as soon as I have a few spare minutes :-)

from readerwriterqueue.

Alright, done. There's now a pop method.

Another workaround (not previously possible until my last commit) is to create a wrapper container that just moves the memory out of the queue and into your object, e.g.:

template<typename T>
struct CtorlessAssignmentContainer
{
    inline void operator=(T&& t)
    {
        std::memcpy(data, &t, sizeof(T));
    }

    inline T& obj() const { return *reinterpret_cast<T*>(data); }
private:
    alignas(alignof(T)) char data[sizeof(T)];
};

Then:

CtorlessAssignmentContainer<MyType> current;
while(queue.try_dequeue(current)) {
    MyType& myType = current.obj();
    // ...
}

from readerwriterqueue.

thank you!! speed isn't that much of an issue in my current context, but it's good to have the workaround you posted as an alternative :)

from readerwriterqueue.

No problem :-)

from readerwriterqueue.