/****************************************************************************
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** Copyright (C) 1992-2004 Trolltech AS. All rights reserved.
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** This file is part of the core module of the Qt Toolkit.
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** LICENSE.QPL included in the packaging of this file.
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** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.
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**   information about Qt Commercial License Agreements.
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#ifndef QBITARRAY_H
#define QBITARRAY_H

#include "qbytearray.h"

class QBitRef;
class Q_CORE_EXPORT QBitArray
{
    friend Q_CORE_EXPORT QDataStream &operator<<(QDataStream &, const QBitArray &);
    friend Q_CORE_EXPORT QDataStream &operator>>(QDataStream &, QBitArray &);
    QByteArray d;

public:
    inline QBitArray() {}
    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(); }

    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)
        { *this = QBitArray((size < 0 ? this->size() : size), val); return true; }
    void fill(bool val, int first, int last);

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

QBitArray operator&(const QBitArray &, const QBitArray &);
QBitArray operator|(const QBitArray &, const QBitArray &);
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)) |= (1 << (i & 7)); }

inline void QBitArray::clearBit(int i)
{ Q_ASSERT(i >= 0 && i < size());
 *(reinterpret_cast<uchar*>(d.data())+1+(i>>3)) &= ~(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 = 1<< (i&7); uchar* p = reinterpret_cast<uchar*>(d.data())+1+(i>>3);
 uchar c = *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);

#endif // QBITARRAY_H
