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qt'QSizePolicy (./qt-2.1.0/src/kernel/qsizepolicy.h:33)

class Q_EXPORT QSizePolicy
{
private:
    enum { HSize = 6, HMask = 0x3f, VMask = HMask << HSize,
	   MayGrow = 1, ExpMask = 2, MayShrink = 4 };
public:
    enum SizeType { Fixed = 0,
		    Minimum = MayGrow,
		    Maximum = MayShrink,
		    Preferred = MayGrow|MayShrink ,
		    MinimumExpanding = Minimum|ExpMask,
		    Expanding = MinimumExpanding|MayShrink };

    enum ExpandData { NoDirection = 0,
		      Horizontal = 1,
		      Vertical = 2,
		      BothDirections = Horizontal | Vertical };

    QSizePolicy() { data = 0; }

    QSizePolicy( SizeType hor, SizeType ver, bool hfw = FALSE );

    SizeType horData() const { return (SizeType)( data & HMask ); }
    SizeType verData() const { return (SizeType)(( data & VMask ) >> HSize); }

    bool mayShrinkHorizontally() const { return horData() & MayShrink; }
    bool mayShrinkVertically() const { return verData() & MayShrink; }
    bool mayGrowHorizontally() const { return horData() & MayGrow; }
    bool mayGrowVertically() const { return verData() & MayGrow; }

    ExpandData expanding() const
    {
	return (ExpandData)( (int)(verData()&ExpMask ? Vertical : 0)+
			     (int)(horData()&ExpMask ? Horizontal : 0) );
    }

    void setHorData( SizeType d ) { data = (data & ~HMask) | d; }
    void setVerData( SizeType d ) { data = (data & ~(HMask<<HSize)) |
					   (d<<HSize); }
		
    void setHeightForWidth( bool b ) { data = b ? data & ~( 1 << 2*HSize )
					      :  data | ( 1 << 2*HSize ); }
    bool hasHeightForWidth() const { return data & ( 1 << 2*HSize ); }

private:
    QSizePolicy( int i ): data( i ) {}

    Q_UINT16 data;
};

inline QSizePolicy::QSizePolicy( SizeType hor, SizeType ver, bool hfw )
	: data( hor | (ver<<HSize) | (hfw ? (1<<2*HSize) : 0) ) {}

qt'QSizePolicy::QSizePolicy() (./qt-2.1.0/include/qsizepolicy.h:83)

inline QSizePolicy::QSizePolicy( SizeType hor, SizeType ver, bool hfw )
	: data( hor | (ver<<HSize) | (hfw ? (1<<2*HSize) : 0) ) {}

qt'QSizePolicy::QSizePolicy() (./qt-2.1.0/src/kernel/qsizepolicy.h:83)

inline QSizePolicy::QSizePolicy( SizeType hor, SizeType ver, bool hfw )
	: data( hor | (ver<<HSize) | (hfw ? (1<<2*HSize) : 0) ) {}