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#ifndef QBITARRAY_H

#define QBITARRAY_H

#include <QtCore/qbytearray.h>

QT_BEGIN_HEADER

QT_BEGIN_NAMESPACE

QT_MODULE(Core)

class QBitRef;

class Q_CORE_EXPORT QBitArray

{

    friend Q_CORE_EXPORT QDataStream &operator<<(QDataStream &, const QBitArray &);

    friend Q_CORE_EXPORT QDataStream &operator>>(QDataStream &, QBitArray &);

    friend Q_CORE_EXPORT uint qHash(const QBitArray &key);

    QByteArray d;

public:

    inline QBitArray() {}

    explicit QBitArray(int size, bool val = false);

    QBitArray(const QBitArray &other) : d(other.d) {}

    inline QBitArray &operator=(const QBitArray &other) { d = other.d; return *this; }

    inline int size() const { return (d.size() << 3) - *d.constData(); }

    inline int count() const { return (d.size() << 3) - *d.constData(); }

    int count(bool on) const;

    // ### Qt 5: Store the number of set bits separately

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

    inline bool isNull() const { return d.isNull(); }

    void resize(int size);

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

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

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

    bool testBit(int i) const;

    void setBit(int i);

    void setBit(int i, bool val);

    void clearBit(int i);

    bool toggleBit(int i);

    bool at(int i) const;

    QBitRef operator[](int i);

    bool operator[](int i) const;

    QBitRef operator[](uint i);

    bool operator[](uint i) const;

    QBitArray& operator&=(const QBitArray &);

    QBitArray& operator|=(const QBitArray &);

    QBitArray& operator^=(const QBitArray &);

    QBitArray  operator~() const;

    inline bool operator==(const QBitArray& a) const { return d == a.d; }

    inline bool operator!=(const QBitArray& a) const { return d != a.d; }

    inline bool fill(bool val, int size = -1);

    void fill(bool val, int first, int last);

    inline void truncate(int pos) { if (pos < size()) resize(pos); }

public:

    typedef QByteArray::DataPtr DataPtr;

    inline DataPtr &data_ptr() { return d.data_ptr(); }

};

inline bool QBitArray::fill(bool aval, int asize)

{ *this = QBitArray((asize < 0 ? this->size() : asize), aval); return true; }

Q_CORE_EXPORT QBitArray operator&(const QBitArray &, const QBitArray &);

Q_CORE_EXPORT QBitArray operator|(const QBitArray &, const QBitArray &);

Q_CORE_EXPORT QBitArray operator^(const QBitArray &, const QBitArray &);

inline bool QBitArray::testBit(int i) const

{ Q_ASSERT(i >= 0 && i < size());

 return (*(reinterpret_cast<const uchar*>(d.constData())+1+(i>>3)) & (1 << (i & 7))) != 0; }

inline void QBitArray::setBit(int i)

{ Q_ASSERT(i >= 0 && i < size());

 *(reinterpret_cast<uchar*>(d.data())+1+(i>>3)) |= uchar(1 << (i & 7)); }

inline void QBitArray::clearBit(int i)

{ Q_ASSERT(i >= 0 && i < size());

 *(reinterpret_cast<uchar*>(d.data())+1+(i>>3)) &= ~uchar(1 << (i & 7)); }

inline void QBitArray::setBit(int i, bool val)

{ if (val) setBit(i); else clearBit(i); }

inline bool QBitArray::toggleBit(int i)

{ Q_ASSERT(i >= 0 &&  i < size());

 uchar b = uchar(1<<(i&7)); uchar* p = reinterpret_cast<uchar*>(d.data())+1+(i>>3);

 uchar c = uchar(*p&b); *p^=b; return c!=0; }

inline bool QBitArray::operator[](int i) const { return testBit(i); }

inline bool QBitArray::operator[](uint i) const { return testBit(i); }

inline bool QBitArray::at(int i) const { return testBit(i); }

class Q_CORE_EXPORT QBitRef

{

private:

    QBitArray& a;

    int i;

    inline QBitRef(QBitArray& array, int idx) : a(array), i(idx) {}

    friend class QBitArray;

public:

    inline operator bool() const { return a.testBit(i); }

    inline bool operator!() const { return !a.testBit(i); }

    QBitRef& operator=(const QBitRef& val) { a.setBit(i, val); return *this; }

    QBitRef& operator=(bool val) { a.setBit(i, val); return *this; }

};

inline QBitRef QBitArray::operator[](int i)

{ Q_ASSERT(i >= 0); return QBitRef(*this, i); }

inline QBitRef QBitArray::operator[](uint i)

{ return QBitRef(*this, i); }

#ifndef QT_NO_DATASTREAM

Q_CORE_EXPORT QDataStream &operator<<(QDataStream &, const QBitArray &);

Q_CORE_EXPORT QDataStream &operator>>(QDataStream &, QBitArray &);

#endif

Q_DECLARE_TYPEINFO(QBitArray, Q_MOVABLE_TYPE);

Q_DECLARE_SHARED(QBitArray)

QT_END_NAMESPACE

QT_END_HEADER

#endif // QBITARRAY_H