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#ifndef QSET_H

#define QSET_H

#include <QtCore/qhash.h>

QT_BEGIN_HEADER

QT_BEGIN_NAMESPACE

QT_MODULE(Core)

template <class T>

class QSet

{

    typedef QHash<T, QHashDummyValue> Hash;

public:

    inline QSet() {}

    inline QSet(const QSet<T> &other) : q_hash(other.q_hash) {}

    inline QSet<T> &operator=(const QSet<T> &other)

        { q_hash = other.q_hash; return *this; }

    inline bool operator==(const QSet<T> &other) const

        { return q_hash == other.q_hash; }

    inline bool operator!=(const QSet<T> &other) const

        { return q_hash != other.q_hash; }

    inline int size() const { return q_hash.size(); }

    inline bool isEmpty() const { return q_hash.isEmpty(); }

    inline int capacity() const { return q_hash.capacity(); }

    inline void reserve(int size);

    inline void squeeze() { q_hash.squeeze(); }

    inline void detach() { q_hash.detach(); }

    inline bool isDetached() const { return q_hash.isDetached(); }

    inline void setSharable(bool sharable) { q_hash.setSharable(sharable); }

    inline void clear() { q_hash.clear(); }

    inline bool remove(const T &value) { return q_hash.remove(value) != 0; }

    inline bool contains(const T &value) const { return q_hash.contains(value); }

    bool contains(const QSet<T> &set) const;

    class const_iterator;

    class iterator

    {

        typedef QHash<T, QHashDummyValue> Hash;

        typename Hash::iterator i;

        friend class const_iterator;

    public:

        typedef std::bidirectional_iterator_tag iterator_category;

        typedef ptrdiff_t difference_type;

        typedef T value_type;

        typedef const T *pointer;

        typedef const T &reference;

        inline iterator() {}

        inline iterator(typename Hash::iterator o) : i(o) {}

        inline iterator(const iterator &o) : i(o.i) {}

        inline iterator &operator=(const iterator &o) { i = o.i; return *this; }

        inline const T &operator*() const { return i.key(); }

        inline const T *operator->() const { return &i.key(); }

        inline bool operator==(const iterator &o) const { return i == o.i; }

        inline bool operator!=(const iterator &o) const { return i != o.i; }

        inline bool operator==(const const_iterator &o) const

            { return i == o.i; }

        inline bool operator!=(const const_iterator &o) const

            { return i != o.i; }

        inline iterator &operator++() { ++i; return *this; }

        inline iterator operator++(int) { iterator r = *this; ++i; return r; }

        inline iterator &operator--() { --i; return *this; }

        inline iterator operator--(int) { iterator r = *this; --i; return r; }

        inline iterator operator+(int j) const { return i + j; }

        inline iterator operator-(int j) const { return i - j; }

        inline iterator &operator+=(int j) { i += j; return *this; }

        inline iterator &operator-=(int j) { i -= j; return *this; }

    };

    class const_iterator

    {

        typedef QHash<T, QHashDummyValue> Hash;

        typename Hash::const_iterator i;

        friend class iterator;

    public:

        typedef std::bidirectional_iterator_tag iterator_category;

        typedef ptrdiff_t difference_type;

        typedef T value_type;

        typedef const T *pointer;

        typedef const T &reference;

        inline const_iterator() {}

        inline const_iterator(typename Hash::const_iterator o) : i(o) {}

        inline const_iterator(const const_iterator &o) : i(o.i) {}

        inline const_iterator(const iterator &o)

            : i(o.i) {}

        inline const_iterator &operator=(const const_iterator &o) { i = o.i; return *this; }

        inline const T &operator*() const { return i.key(); }

        inline const T *operator->() const { return &i.key(); }

        inline bool operator==(const const_iterator &o) const { return i == o.i; }

        inline bool operator!=(const const_iterator &o) const { return i != o.i; }

        inline const_iterator &operator++() { ++i; return *this; }

        inline const_iterator operator++(int) { const_iterator r = *this; ++i; return r; }

        inline const_iterator &operator--() { --i; return *this; }

        inline const_iterator operator--(int) { const_iterator r = *this; --i; return r; }

        inline const_iterator operator+(int j) const { return i + j; }

        inline const_iterator operator-(int j) const { return i - j; }

        inline const_iterator &operator+=(int j) { i += j; return *this; }

        inline const_iterator &operator-=(int j) { i -= j; return *this; }

    };

    // STL style

    inline iterator begin() { return q_hash.begin(); }

    inline const_iterator begin() const { return q_hash.begin(); }

    inline const_iterator constBegin() const { return q_hash.constBegin(); }

    inline iterator end() { return q_hash.end(); }

    inline const_iterator end() const { return q_hash.end(); }

    inline const_iterator constEnd() const { return q_hash.constEnd(); }

    iterator erase(iterator i)

        { return q_hash.erase(reinterpret_cast<typename Hash::iterator &>(i)); }

    // more Qt

    typedef iterator Iterator;

    typedef const_iterator ConstIterator;

    inline int count() const { return q_hash.count(); }

    inline const_iterator insert(const T &value) // ### Qt 5: should return an 'iterator'

        { return static_cast<typename Hash::const_iterator>(q_hash.insert(value,

                                                                          QHashDummyValue())); }

    iterator find(const T &value) { return q_hash.find(value); }

    const_iterator find(const T &value) const { return q_hash.find(value); }

    inline const_iterator constFind(const T &value) const { return find(value); }

    QSet<T> &unite(const QSet<T> &other);

    QSet<T> &intersect(const QSet<T> &other);

    QSet<T> &subtract(const QSet<T> &other);

    // STL compatibility

    typedef T key_type;

    typedef T value_type;

    typedef value_type *pointer;

    typedef const value_type *const_pointer;

    typedef value_type &reference;

    typedef const value_type &const_reference;

    typedef ptrdiff_t difference_type;

    typedef int size_type;

    inline bool empty() const { return isEmpty(); }

    // comfort

    inline QSet<T> &operator<<(const T &value) { insert(value); return *this; }

    inline QSet<T> &operator|=(const QSet<T> &other) { unite(other); return *this; }

    inline QSet<T> &operator|=(const T &value) { insert(value); return *this; }

    inline QSet<T> &operator&=(const QSet<T> &other) { intersect(other); return *this; }

    inline QSet<T> &operator&=(const T &value)

        { QSet<T> result; if (contains(value)) result.insert(value); return (*this = result); }

    inline QSet<T> &operator+=(const QSet<T> &other) { unite(other); return *this; }

    inline QSet<T> &operator+=(const T &value) { insert(value); return *this; }

    inline QSet<T> &operator-=(const QSet<T> &other) { subtract(other); return *this; }

    inline QSet<T> &operator-=(const T &value) { remove(value); return *this; }

    inline QSet<T> operator|(const QSet<T> &other) const

        { QSet<T> result = *this; result |= other; return result; }

    inline QSet<T> operator&(const QSet<T> &other) const

        { QSet<T> result = *this; result &= other; return result; }

    inline QSet<T> operator+(const QSet<T> &other) const

        { QSet<T> result = *this; result += other; return result; }

    inline QSet<T> operator-(const QSet<T> &other) const

        { QSet<T> result = *this; result -= other; return result; }

#if QT_VERSION < 0x050000

    // ### Qt 5: remove

    inline QSet<T> operator|(const QSet<T> &other)

        { QSet<T> result = *this; result |= other; return result; }

    inline QSet<T> operator&(const QSet<T> &other)

        { QSet<T> result = *this; result &= other; return result; }

    inline QSet<T> operator+(const QSet<T> &other)

        { QSet<T> result = *this; result += other; return result; }

    inline QSet<T> operator-(const QSet<T> &other)

        { QSet<T> result = *this; result -= other; return result; }

#endif

    QList<T> toList() const;

    inline QList<T> values() const { return toList(); }

    static QSet<T> fromList(const QList<T> &list);

private:

    Hash q_hash;

};

template <class T>

Q_INLINE_TEMPLATE void QSet<T>::reserve(int asize) { q_hash.reserve(asize); }

template <class T>

Q_INLINE_TEMPLATE QSet<T> &QSet<T>::unite(const QSet<T> &other)

{

    QSet<T> copy(other);

    typename QSet<T>::const_iterator i = copy.constEnd();

    while (i != copy.constBegin()) {

        --i;

        insert(*i);

    }

    return *this;

}

template <class T>

Q_INLINE_TEMPLATE QSet<T> &QSet<T>::intersect(const QSet<T> &other)

{

    QSet<T> copy1(*this);

    QSet<T> copy2(other);

    typename QSet<T>::const_iterator i = copy1.constEnd();

    while (i != copy1.constBegin()) {

        --i;

        if (!copy2.contains(*i))

            remove(*i);

    }

    return *this;

}

template <class T>

Q_INLINE_TEMPLATE QSet<T> &QSet<T>::subtract(const QSet<T> &other)

{

    QSet<T> copy1(*this);

    QSet<T> copy2(other);

    typename QSet<T>::const_iterator i = copy1.constEnd();

    while (i != copy1.constBegin()) {

        --i;

        if (copy2.contains(*i))

            remove(*i);

    }

    return *this;

}

template <class T>

Q_INLINE_TEMPLATE bool QSet<T>::contains(const QSet<T> &other) const

{

    typename QSet<T>::const_iterator i = other.constBegin();

    while (i != other.constEnd()) {

        if (!contains(*i))

            return false;

        ++i;

    }

    return true;

}

template <typename T>

Q_OUTOFLINE_TEMPLATE QList<T> QSet<T>::toList() const

{

    QList<T> result;

    typename QSet<T>::const_iterator i = constBegin();

    while (i != constEnd()) {

        result.append(*i);

        ++i;

    }

    return result;

}

template <typename T>

Q_OUTOFLINE_TEMPLATE QSet<T> QList<T>::toSet() const

{

    QSet<T> result;

    result.reserve(size());

    for (int i = 0; i < size(); ++i)

        result.insert(at(i));

    return result;

}

template <typename T>

QSet<T> QSet<T>::fromList(const QList<T> &list)

{

    return list.toSet();

}

template <typename T>

QList<T> QList<T>::fromSet(const QSet<T> &set)

{

    return set.toList();

}

Q_DECLARE_SEQUENTIAL_ITERATOR(Set)

template <typename T>

class QMutableSetIterator

{

    typedef typename QSet<T>::iterator iterator;

    QSet<T> *c;

    iterator i, n;

    inline bool item_exists() const { return n != c->constEnd(); }

public:

    inline QMutableSetIterator(QSet<T> &container)

        : c(&container)

    { c->setSharable(false); i = c->begin(); n = c->end(); }

    inline ~QMutableSetIterator()

    { c->setSharable(true); }

    inline QMutableSetIterator &operator=(QSet<T> &container)

    { c->setSharable(true); c = &container; c->setSharable(false);

      i = c->begin(); n = c->end(); return *this; }

    inline void toFront() { i = c->begin(); n = c->end(); }

    inline void toBack() { i = c->end(); n = i; }

    inline bool hasNext() const { return c->constEnd() != i; }

    inline const T &next() { n = i++; return *n; }

    inline const T &peekNext() const { return *i; }

    inline bool hasPrevious() const { return c->constBegin() != i; }

    inline const T &previous() { n = --i; return *n; }

    inline const T &peekPrevious() const { iterator p = i; return *--p; }

    inline void remove()

    { if (c->constEnd() != n) { i = c->erase(n); n = c->end(); } }

    inline const T &value() const { Q_ASSERT(item_exists()); return *n; }

    inline bool findNext(const T &t)

    { while (c->constEnd() != (n = i)) if (*i++ == t) return true; return false; }

    inline bool findPrevious(const T &t)

    { while (c->constBegin() != i) if (*(n = --i) == t) return true;

      n = c->end(); return false;  }

};

QT_END_NAMESPACE

QT_END_HEADER

#endif // QSET_H