My queue

// File: queue.hpp
#ifndef _VFN_QUEUE_H_
#define _VFN_QUEUE_H_

namespace vfn
{
    class queueEmpty : public std::exception {};
    class queueFull  : public std::exception {};

    template <typename T, unsigned int N>
    class queue
    {
      private:
        T            buffer[N];
        unsigned int write;
        unsigned int read;
        bool         empty;
        bool         full;
      public:
        queue() : write(0),
                  read(0),
                  empty(true),
                  full(false) {}

        T pop() throw(queueEmpty)
        {
            if (empty)
                throw queueEmpty();
            T& tmp = buffer[read++];
            read  %= N;
            empty  = (read == write);
            full   = false;

            return tmp;
        }
        T rpop() throw(queueEmpty)
        {
            if (empty)
                throw queueEmpty();
            write  = (write-1 + N) % N;
            T& tmp = buffer[write];
            empty  = (read == write);
            full   = false;

            return tmp;
        }
        void push(T a) throw(queueFull)
        {
            if (full)
                throw queueFull();
            buffer[write++] = a;
            write          %= N;
            full            = (read == write);
            empty           = false;
        }
        void rpush(T a) throw(queueFull)
        {
            if (full)
                throw queueFull();
            read         = (read-1 + N) % N;
            buffer[read] = a;
            full         = (read == write);
            empty        = false;
        }
    };
}

#endif