Method dequeue

benchmarks/dlib/queue/queue_kernel_1.h:265–292

        typename mem_manager
        >
    void queue_kernel_1<T,mem_manager>::
    dequeue (
        T& item
    )
    {
        // swap out into item
        exchange(item,out->item);

        --queue_size;

        if (queue_size == 0)
        {
            delete out;
        }
        else
        {
            node* temp = out;
            
            // move out pointer to the next element in the queue
            out = out->last;

            // delete old node
            delete temp;
        }

        // put the enumerator at the start
        reset();
    }

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