Method enqueue

benchmarks/dlib/queue/queue_kernel_1.h:234–257

        typename mem_manager
        >
    void queue_kernel_1<T,mem_manager>::
    enqueue (
        T& item
    )
    {
        // make new node
        node* temp = new node;

        // swap item into new node
        exchange(item,temp->item);
        
        if (queue_size == 0)
            out = temp;
        else
            in->last = temp;

        // make in point to the new node
        in = temp;
        
        ++queue_size;

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

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