#ifndef CLICK_VECTOR_HH
#define CLICK_VECTOR_HH
#include <click/algorithm.hh>
#include <click/array_memory.hh>
CLICK_DECLS

/** @file <click/vector.hh>
  @brief Click's vector container template. */

/** @cond never */
template <typename AM> class vector_memory { public:
    typedef int size_type;
    typedef typename AM::type type;
    typedef type *iterator;
    inline bool need_argument_copy(const type *argp) const {
	return fast_argument<type>::is_reference
	    && (uintptr_t) argp - (uintptr_t) l_ < (size_t) (n_ * sizeof(type));
    }

    vector_memory()
	: l_(0), n_(0), capacity_(0) {
    }
    ~vector_memory();

    void assign(const vector_memory<AM> &x);
    void assign(size_type n, const type *vp);
    void resize(size_type n, const type *vp);
    iterator begin() {
	return l_;
    }
    iterator end() {
	return l_ + n_;
    }
    iterator insert(iterator it, const type *vp);
    iterator erase(iterator a, iterator b);
    inline void push_back(const type *vp) {
	if (n_ < capacity_) {
	    AM::mark_undefined(l_ + n_, 1);
	    AM::fill(l_ + n_, 1, vp);
	    ++n_;
	} else
	    reserve_and_push_back(-1, vp);
    }
#if HAVE_CXX_RVALUE_REFERENCES
    inline void move_construct_back(type* vp) {
	if (n_ < capacity_) {
	    AM::mark_undefined(l_ + n_, 1);
	    AM::move_construct(l_ + n_, vp);
	    ++n_;
	} else
	    reserve_and_push_back(-1, vp);
    }
#endif
    inline void pop_back() {
	assert(n_ > 0);
	--n_;
	AM::destroy(l_ + n_, 1);
	AM::mark_noaccess(l_ + n_, 1);
    }
    inline void clear() {
	AM::destroy(l_, n_);
	AM::mark_noaccess(l_, n_);
	n_ = 0;
    }
    bool reserve_and_push_back(size_type n, const type *vp);
    void swap(vector_memory<AM> &x);

    type *l_;
    size_type n_;
    size_type capacity_;
};
/** @endcond never */


/** @class Vector
  @brief Vector template.

  Vector implements a vector, or growable array, suitable for use in the
  kernel or at user level. Its interface should be compatible with C++'s
  std::vector, although that type has more methods. Vector elements are
  accessed with operator[] like arrays, and can be resized and expanded
  through append operations (see push_back() and resize()). A common (and
  efficient) usage pattern grows a Vector through repeated push_back() calls.

  Vector iterators are pointers into the underlying array. This can simplify
  interactions between Vector and code that expects conventional C arrays.

  Vector's push_front() and pop_front() operations are quite expensive (O(size())
  complexity). For fast push_front() and pop_front() operations, use Deque.

  Example code:
  @code
  Vector<int> v;
  printf("%d\n", v.size());         // prints "0"

  v.push_back(1);
  v.push_back(2);
  printf("%d\n", v.size());         // prints "2"
  printf("%d %d\n", v[0], v[1]);    // prints "1 2"

  Vector<int>::iterator it = v.begin();
  int *ip = it;                     // Vector iterators are pointers
  assert(it == v.end() - 2);

  v.erase(v.begin());
  printf("%d\n", v.size());         // prints "1"
  printf("%d\n", v[0]);             // prints "2"
  @endcode
*/
template <typename T>
class Vector {

    typedef typename array_memory<T>::type array_memory_type;
    mutable vector_memory<array_memory_type> vm_;

  public:

    typedef T value_type;		///< Value type.
    typedef T &reference;		///< Reference to value type.
    typedef const T &const_reference;	///< Const reference to value type.
    typedef T *pointer;			///< Pointer to value type.
    typedef const T *const_pointer;	///< Pointer to const value type.

    /** @brief Type used for value arguments (either T or const T &). */
    typedef typename fast_argument<T>::type value_argument_type;
    typedef const T &const_access_type;

    typedef int size_type;		///< Type of sizes (size()).

    typedef T *iterator;		///< Iterator type.
    typedef const T *const_iterator;	///< Const iterator type.

    /** @brief Constant passed to reserve() to grow the Vector. */
    enum { RESERVE_GROW = (size_type) -1 };


    explicit inline Vector();
    explicit inline Vector(size_type n, value_argument_type v);
    inline Vector(const Vector<T> &x);
#if HAVE_CXX_RVALUE_REFERENCES
    inline Vector(Vector<T> &&x);
#endif

    inline Vector<T> &operator=(const Vector<T> &x);
#if HAVE_CXX_RVALUE_REFERENCES
    inline Vector<T> &operator=(Vector<T> &&x);
#endif
    inline Vector<T> &assign(size_type n, value_argument_type v = T());

    inline iterator begin();
    inline iterator end();
    inline const_iterator begin() const;
    inline const_iterator end() const;
    inline const_iterator cbegin() const;
    inline const_iterator cend() const;

    inline size_type size() const;
    inline size_type capacity() const;
    inline bool empty() const;
    inline void resize(size_type n, value_argument_type v = T());
    inline bool reserve(size_type n);

    inline T &operator[](size_type i);
    inline const T &operator[](size_type i) const;
    inline T &at(size_type i);
    inline const T &at(size_type i) const;
    inline T &front();
    inline const T &front() const;
    inline T &back();
    inline const T &back() const;

    inline T &unchecked_at(size_type i);
    inline const T &unchecked_at(size_type i) const;
    inline T &at_u(size_type i) CLICK_DEPRECATED;
    inline const T &at_u(size_type i) const CLICK_DEPRECATED;

    inline T *data();
    inline const T *data() const;

    inline void push_back(value_argument_type v);
#if HAVE_CXX_RVALUE_REFERENCES
    template <typename A = fast_argument<T> >
    inline typename A::enable_rvalue_reference push_back(T &&v);
#endif
    inline void pop_back();
    inline void push_front(value_argument_type v);
    inline void pop_front();

    inline iterator insert(iterator it, value_argument_type v);
    inline iterator erase(iterator it);
    inline iterator erase(iterator a, iterator b);

    inline void clear();

    inline void swap(Vector<T> &x);

};

/** @brief Construct an empty vector. */
template <typename T>
inline Vector<T>::Vector() {
}

/** @brief Construct a vector containing @a n copies of @a v. */
template <typename T>
inline Vector<T>::Vector(size_type n, value_argument_type v) {
    vm_.resize(n, array_memory_type::cast(&v));
}

/** @brief Construct a vector as a copy of @a x. */
template <typename T>
inline Vector<T>::Vector(const Vector<T> &x) {
    vm_.assign(x.vm_);
}

#if HAVE_CXX_RVALUE_REFERENCES
/** @overload */
template <typename T>
inline Vector<T>::Vector(Vector<T> &&x) {
    vm_.swap(x.vm_);
}
#endif

/** @brief Return the number of elements. */
template <typename T>
inline typename Vector<T>::size_type Vector<T>::size() const {
    return vm_.n_;
}

/** @brief Test if the vector is empty (size() == 0). */
template <typename T>
inline bool Vector<T>::empty() const {
    return vm_.n_ == 0;
}

/** @brief Return the vector's capacity.

    The capacity is greater than or equal to the size(). Functions such as
    resize(n) will not allocate new memory for the vector if n <=
    capacity(). */
template <typename T>
inline typename Vector<T>::size_type Vector<T>::capacity() const {
    return vm_.capacity_;
}

/** @brief Return an iterator for the first element in the vector. */
template <typename T>
inline typename Vector<T>::iterator Vector<T>::begin() {
    return (iterator) vm_.l_;
}

/** @overload */
template <typename T>
inline typename Vector<T>::const_iterator Vector<T>::begin() const {
    return (const_iterator) vm_.l_;
}

/** @brief Return an iterator for the end of the vector.
    @invariant end() == begin() + size() */
template <typename T>
inline typename Vector<T>::iterator Vector<T>::end() {
    return (iterator) vm_.l_ + vm_.n_;
}

/** @overload */
template <typename T>
inline typename Vector<T>::const_iterator Vector<T>::end() const {
    return (const_iterator) vm_.l_ + vm_.n_;
}

/** @brief Return a const_iterator for the beginning of the vector. */
template <typename T>
inline typename Vector<T>::const_iterator Vector<T>::cbegin() const {
    return (const_iterator) vm_.l_;
}

/** @brief Return a const_iterator for the end of the vector.
    @invariant cend() == cbegin() + size() */
template <typename T>
inline typename Vector<T>::const_iterator Vector<T>::cend() const {
    return (iterator) vm_.l_ + vm_.n_;
}

/** @brief Return a reference to the <em>i</em>th element.
    @pre 0 <= @a i < size() */
template <typename T>
inline T &Vector<T>::operator[](size_type i) {
    assert((unsigned) i < (unsigned) vm_.n_);
    return *(T *)&vm_.l_[i];
}

/** @overload */
template <typename T>
inline const T &Vector<T>::operator[](size_type i) const {
    assert((unsigned) i < (unsigned) vm_.n_);
    return *(T *)&vm_.l_[i];
}

/** @brief Return a reference to the <em>i</em>th element.
    @pre 0 <= @a i < size()
    @sa operator[]() */
template <typename T>
inline T &Vector<T>::at(size_type i) {
    return operator[](i);
}

/** @overload */
template <typename T>
inline const T &Vector<T>::at(size_type i) const {
    return operator[](i);
}

/** @brief Return a reference to the first element.
    @pre !empty() */
template <typename T>
inline T &Vector<T>::front() {
    return operator[](0);
}

/** @overload */
template <typename T>
inline const T &Vector<T>::front() const {
    return operator[](0);
}

/** @brief Return a reference to the last element (number size()-1).
    @pre !empty() */
template <typename T>
inline T &Vector<T>::back() {
    return operator[](vm_.n_ - 1);
}

/** @overload */
template <typename T>
inline const T &Vector<T>::back() const {
    return operator[](vm_.n_ - 1);
}

/** @brief Return a reference to the <em>i</em>th element.
    @pre 0 <= @a i < size()

    Unlike operator[]() and at(), this function does not check bounds,
    even if assertions are enabled. Use with caution. */
template <typename T>
inline T &Vector<T>::unchecked_at(size_type i) {
    return *(T *)&vm_.l_[i];
}

/** @overload */
template <typename T>
inline const T &Vector<T>::unchecked_at(size_type i) const {
    return *(T *)&vm_.l_[i];
}

/** @cond never */
template <typename T>
inline T &Vector<T>::at_u(size_type i) {
    return unchecked_at(i);
}

template <typename T>
inline const T &Vector<T>::at_u(size_type i) const {
    return unchecked_at(i);
}
/** @endcond never */

/** @brief Return a pointer to the vector's data.

    May be null if empty(). */
template <typename T>
inline T *Vector<T>::data() {
    return (T *) vm_.l_;
}

/** @overload */
template <typename T>
inline const T *Vector<T>::data() const {
    return (const T *) vm_.l_;
}

/** @brief Resize the vector to contain @a n elements.
    @param n new size
    @param v value used to fill new elements */
template <typename T>
inline void Vector<T>::resize(size_type n, value_argument_type v) {
    vm_.resize(n, array_memory_type::cast(&v));
}

/** @brief Append element @a v.

    A copy of @a v is inserted at position size(). Takes amortized O(1)
    time. */
template <typename T>
inline void Vector<T>::push_back(value_argument_type v) {
    vm_.push_back(array_memory_type::cast(&v));
}

#if HAVE_CXX_RVALUE_REFERENCES
/** @overload */
template <typename T> template <typename A>
inline typename A::enable_rvalue_reference Vector<T>::push_back(T&& v)
{
    vm_.move_construct_back(array_memory_type::cast(&v));
}
#endif

/** @brief Remove the last element.

    Takes O(1) time. */
template <typename T>
inline void Vector<T>::pop_back() {
    vm_.pop_back();
}

/** @brief Prepend element @a v.

    A copy of @a v is added to position 0. Other elements are shifted one
    position forward. Takes O(size()) time. */
template <typename T>
inline void Vector<T>::push_front(value_argument_type v) {
    vm_.insert(vm_.l_, array_memory_type::cast(&v));
}

/** @brief Remove the first element.

    Other elements are shifted one position backward. Takes O(size())
    time. */
template <typename T>
inline void Vector<T>::pop_front() {
    vm_.erase(vm_.l_, vm_.l_ + 1);
}

/** @brief Insert @a v before position @a it.
    @return An iterator pointing at the new element. */
template <typename T>
inline typename Vector<T>::iterator
Vector<T>::insert(iterator it, value_argument_type v) {
    return (iterator) vm_.insert(array_memory_type::cast(it),
				 array_memory_type::cast(&v));
}

/** @brief Remove the element at position @a it.
    @return An iterator pointing at the element following @a it. */
template <typename T>
inline typename Vector<T>::iterator
Vector<T>::erase(iterator it) {
    return (it < end() ? erase(it, it + 1) : it);
}

/** @brief Remove the elements in [@a a, @a b).
    @return An iterator corresponding to @a b. */
template <typename T>
inline typename Vector<T>::iterator
Vector<T>::erase(iterator a, iterator b) {
    return (iterator) vm_.erase(array_memory_type::cast(a),
				array_memory_type::cast(b));
}

/** @brief Remove all elements.
    @post size() == 0 */
template <typename T>
inline void Vector<T>::clear() {
    vm_.clear();
}

/** @brief Reserve space for at least @a n more elements.
    @return true iff reserve succeeded.

    This function changes the vector's capacity(), not its size(). If
    reserve(@a n) succeeds, then any succeeding call to resize(@a m) with @a
    m < @a n will succeed without allocating vector memory. */
template <typename T>
inline bool Vector<T>::reserve(size_type n) {
    return vm_.reserve_and_push_back(n, 0);
}

/** @brief Swap the contents of this vector and @a x. */
template <typename T>
inline void Vector<T>::swap(Vector<T> &x) {
    vm_.swap(x.vm_);
}

/** @brief Replace this vector's contents with a copy of @a x. */
template <typename T>
inline Vector<T> &Vector<T>::operator=(const Vector<T> &x) {
    vm_.assign(x.vm_);
    return *this;
}

#if HAVE_CXX_RVALUE_REFERENCES
template <typename T>
inline Vector<T> &Vector<T>::operator=(Vector<T> &&x) {
    vm_.swap(x.vm_);
    return *this;
}
#endif

/** @brief Replace this vector's contents with @a n copies of @a v.
    @post size() == @a n */
template <typename T>
inline Vector<T> &Vector<T>::assign(size_type n, value_argument_type v) {
    vm_.assign(n, array_memory_type::cast(&v));
    return *this;
}

template <typename T>
inline void click_swap(Vector<T> &a, Vector<T> &b) {
    a.swap(b);
}

template <typename T>
inline void assign_consume(Vector<T> &a, Vector<T> &b) {
    a.swap(b);
}

CLICK_ENDDECLS
#include <click/vector.cc>
#endif