Question

这里是qstring.h包含文件的所有文本，一字不差。它仅仅用来说明，版权由Trolltech保留。

---

/****************************************************************************
** $Id$
**
** Definition of the QString class, and related Unicode
** functions.
**
** Created : 920609
**
** Copyright (C) 1992-2000 Trolltech AS.  All rights reserved.
**
** This file is part of the tools module of the Qt GUI Toolkit.
**
** This file may be distributed under the terms of the Q Public License
** as defined by Trolltech AS of Norway and appearing in the file
** LICENSE.QPL included in the packaging of this file.
**
** This file may be distributed and/or modified under the terms of the
** GNU General Public License version 2 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.
**
** Licensees holding valid Qt Enterprise Edition or Qt Professional Edition
** licenses may use this file in accordance with the Qt Commercial License
** Agreement provided with the Software.
**
** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
**
** See http://www.trolltech.com/pricing.html or email sales@trolltech.com for
**   information about Qt Commercial License Agreements.
** See http://www.trolltech.com/qpl/ for QPL licensing information.
** See http://www.trolltech.com/gpl/ for GPL licensing information.
**
** Contact info@trolltech.com if any conditions of this licensing are
** not clear to you.
**
**********************************************************************/

#ifndef QSTRING_H
#define QSTRING_H

#ifndef QT_H
#include "qcstring.h"
#endif // QT_H


/*****************************************************************************
  QString class
 *****************************************************************************/

class QRegExp;
class QString;
class QCharRef;

class Q_EXPORT QChar {
public:
    QChar();
    QChar( char c );
    QChar( uchar c );
    QChar( uchar c, uchar r );
    QChar( const QChar& c );
    QChar( ushort rc );
    QChar( short rc );
    QChar( uint rc );
    QChar( int rc );

    QT_STATIC_CONST QChar null;            // 0000
    QT_STATIC_CONST QChar replacement;     // FFFD
    QT_STATIC_CONST QChar byteOrderMark;     // FEFF
    QT_STATIC_CONST QChar byteOrderSwapped;     // FFFE
    QT_STATIC_CONST QChar nbsp;            // 00A0

    // Unicode information

    enum Category
    {
        NoCategory,

        Mark_NonSpacing,          //   Mn
        Mark_SpacingCombining,    //   Mc
        Mark_Enclosing,           //   Me

        Number_DecimalDigit,      //   Nd
        Number_Letter,            //   Nl
        Number_Other,             //   No

        Separator_Space,          //   Zs
        Separator_Line,           //   Zl
        Separator_Paragraph,      //   Zp

        Other_Control,            //   Cc
        Other_Format,             //   Cf
        Other_Surrogate,          //   Cs
        Other_PrivateUse,         //   Co
        Other_NotAssigned,        //   Cn

        Letter_Uppercase,         //   Lu
        Letter_Lowercase,         //   Ll
        Letter_Titlecase,         //   Lt
        Letter_Modifier,          //   Lm
        Letter_Other,             //   Lo

        Punctuation_Connector,    //   Pc
        Punctuation_Dash,         //   Pd
        Punctuation_Dask = Punctuation_Dash, // oops
        Punctuation_Open,         //   Ps
        Punctuation_Close,        //   Pe
        Punctuation_InitialQuote, //   Pi
        Punctuation_FinalQuote,   //   Pf
        Punctuation_Other,        //   Po

        Symbol_Math,              //   Sm
        Symbol_Currency,          //   Sc
        Symbol_Modifier,          //   Sk
        Symbol_Other              //   So
    };

    enum Direction
    {
        DirL, DirR, DirEN, DirES, DirET, DirAN, DirCS, DirB, DirS, DirWS, DirON,
        DirLRE, DirLRO, DirAL, DirRLE, DirRLO, DirPDF, DirNSM, DirBN
    };

    enum Decomposition
    {
        Single, Canonical, Font, NoBreak, Initial, Medial,
        Final, Isolated, Circle, Super, Sub, Vertical,
        Wide, Narrow, Small, Square, Compat, Fraction
    };

    enum Joining
    {
        OtherJoining, Dual, Right, Center
    };

    enum CombiningClass
    {
        Combining_BelowLeftAttached       = 200,
        Combining_BelowAttached           = 202,
        Combining_BelowRightAttached      = 204,
        Combining_LeftAttached            = 208,
        Combining_RightAttached           = 210,
        Combining_AboveLeftAttached       = 212,
        Combining_AboveAttached           = 214,
        Combining_AboveRightAttached      = 216,

        Combining_BelowLeft               = 218,
        Combining_Below                   = 220,
        Combining_BelowRight              = 222,
        Combining_Left                    = 224,
        Combining_Right                   = 226,
        Combining_AboveLeft               = 228,
        Combining_Above                   = 230,
        Combining_AboveRight              = 232,

        Combining_DoubleBelow             = 233,
        Combining_DoubleAbove             = 234,
        Combining_IotaSubscript           = 240
    };

    // ****** WHEN ADDING FUNCTIONS, CONSIDER ADDING TO QCharRef TOO

    int digitValue() const;
    QChar lower() const;
    QChar upper() const;

    Category category() const;
    Direction direction() const;
    Joining joining() const;
    bool mirrored() const;
    QChar mirroredChar() const;
    const QString &decomposition() const;
    Decomposition decompositionTag() const;
    unsigned char combiningClass() const;

    char latin1() const { return ucs > 0xff ? 0 : (char) ucs; }
    ushort unicode() const { return ucs; }
    ushort &unicode() { return ucs; }
#ifndef QT_NO_CAST_ASCII
    // like all ifdef'd code this is undocumented
    operator char() const { return latin1(); }
#endif

    bool isNull() const { return unicode()==0; }
    bool isPrint() const;
    bool isPunct() const;
    bool isSpace() const;
    bool isMark() const;
    bool isLetter() const;
    bool isNumber() const;
    bool isLetterOrNumber() const;
    bool isDigit() const;
    bool isSymbol() const;

    uchar cell() const { return ((uchar) ucs & 0xff); }
    uchar row() const { return ((uchar) (ucs>>8)&0xff); }
    void setCell( uchar cell ) { ucs = (ucs & 0xff00) + cell; }
    void setRow( uchar row ) { ucs = (((ushort) row)<<8) + (ucs&0xff); }

    static bool networkOrdered() {
	int wordSize;
	bool bigEndian = FALSE;
	qSysInfo( &wordSize, &bigEndian );
	return bigEndian;
    }

    friend inline bool operator==( char ch, QChar c );
    friend inline bool operator==( QChar c, char ch );
    friend inline bool operator==( QChar c1, QChar c2 );
    friend inline bool operator!=( QChar c1, QChar c2 );
    friend inline bool operator!=( char ch, QChar c );
    friend inline bool operator!=( QChar c, char ch );
    friend inline bool operator<=( QChar c, char ch );
    friend inline bool operator<=( char ch, QChar c );
    friend inline bool operator<=( QChar c1, QChar c2 );

private:
    ushort ucs;
#if defined(QT_QSTRING_UCS_4)
    ushort grp;
#endif
} Q_PACKED;

inline QChar::QChar()
{
    ucs = 0;
#ifdef QT_QSTRING_UCS_4
    grp = 0;
#endif
}
inline QChar::QChar( char c )
{
    ucs = (uchar)c;
#ifdef QT_QSTRING_UCS_4
    grp = 0;
#endif
}
inline QChar::QChar( uchar c )
{
    ucs = c;
#ifdef QT_QSTRING_UCS_4
    grp = 0;
#endif
}
inline QChar::QChar( uchar c, uchar r )
{
    ucs = (r << 8) | c;
#ifdef QT_QSTRING_UCS_4
    grp = 0;
#endif
}
inline QChar::QChar( const QChar& c )
{
    ucs = c.ucs;
#ifdef QT_QSTRING_UCS_4
    grp = c.grp;
#endif
}

inline QChar::QChar( ushort rc )
{
    ucs = rc;
#ifdef QT_QSTRING_UCS_4
    grp = 0;
#endif
}
inline QChar::QChar( short rc )
{
    ucs = (ushort) rc;
#ifdef QT_QSTRING_UCS_4
    grp = 0;
#endif
}
inline QChar::QChar( uint rc )
{
    ucs = (ushort ) (rc & 0xffff);
#ifdef QT_QSTRING_UCS_4
    grp = (ushort) ((rc >> 16) & 0xffff);
#endif
}
inline QChar::QChar( int rc )
{
    ucs = (ushort) (rc & 0xffff);
#ifdef QT_QSTRING_UCS_4
    grp = (ushort) ((rc >> 16) & 0xffff);
#endif
}


inline bool operator==( char ch, QChar c )
{
    return ((uchar) ch) == c.ucs;
}

inline bool operator==( QChar c, char ch )
{
    return ((uchar) ch) == c.ucs;
}

inline bool operator==( QChar c1, QChar c2 )
{
    return c1.ucs == c2.ucs;
}

inline bool operator!=( QChar c1, QChar c2 )
{
    return c1.ucs != c2.ucs;
}

inline bool operator!=( char ch, QChar c )
{
    return ((uchar)ch) != c.ucs;
}

inline bool operator!=( QChar c, char ch )
{
    return ((uchar) ch) != c.ucs;
}

inline bool operator<=( QChar c, char ch )
{
    return c.ucs <= ((uchar) ch);
}

inline bool operator<=( char ch, QChar c )
{
    return ((uchar) ch) <= c.ucs;
}

inline bool operator<=( QChar c1, QChar c2 )
{
    return c1.ucs <= c2.ucs;
}

inline bool operator>=( QChar c, char ch ) { return ch <= c; }
inline bool operator>=( char ch, QChar c ) { return c <= ch; }
inline bool operator>=( QChar c1, QChar c2 ) { return c2 <= c1; }
inline bool operator<( QChar c, char ch ) { return !(ch<=c); }
inline bool operator<( char ch, QChar c ) { return !(c<=ch); }
inline bool operator<( QChar c1, QChar c2 ) { return !(c2<=c1); }
inline bool operator>( QChar c, char ch ) { return !(ch>=c); }
inline bool operator>( char ch, QChar c ) { return !(c>=ch); }
inline bool operator>( QChar c1, QChar c2 ) { return !(c2>=c1); }

// internal
struct Q_EXPORT QStringData : public QShared {
    QStringData() :
        unicode(0), ascii(0), len(0), simpletext(1), maxl(0), dirty(0) { ref(); }
    QStringData(QChar *u, uint l, uint m) :
        unicode(u), ascii(0), len(l), simpletext(1), maxl(m), dirty(1) { }

    ~QStringData() { if ( unicode ) delete[] ((char*)unicode);
                     if ( ascii ) delete[] ascii; }

    void deleteSelf();
    QChar *unicode;
    char *ascii;
    void setDirty() {
	if ( ascii ) {
	    delete [] ascii;
	    ascii = 0;
	}
	dirty = 1;
    }
#ifdef Q_OS_MAC9
    uint len;
#else
    uint len : 30;
#endif
    uint simpletext : 1;
#ifdef Q_OS_MAC9
    uint maxl;
#else
    uint maxl : 30;
#endif
    uint dirty : 1;
};


class Q_EXPORT QString
{
public:
    QString();                                  // make null string
    QString( QChar );                           // one-char string
    QString( const QString & );                 // impl-shared copy
    QString( const QByteArray& );               // deep copy
    QString( const QChar* unicode, uint length ); // deep copy
#ifndef QT_NO_CAST_ASCII
    QString( const char *str );                 // deep copy
#endif
    ~QString();

    QString    &operator=( const QString & );   // impl-shared copy
#ifndef QT_NO_CAST_ASCII
    QString    &operator=( const char * );      // deep copy
#endif
    QString    &operator=( const QCString& );   // deep copy
    QString    &operator=( QChar c );
    QString    &operator=( char c );

    QT_STATIC_CONST QString null;

    bool        isNull()        const;
    bool        isEmpty()       const;
    uint        length()        const;
    void        truncate( uint pos );

    QString &   fill( QChar c, int len = -1 );

    QString     copy()  const;

    QString arg( long a, int fieldwidth=0, int base=10 ) const;
    QString arg( ulong a, int fieldwidth=0, int base=10 ) const;
    QString arg( int a, int fieldwidth=0, int base=10 ) const;
    QString arg( uint a, int fieldwidth=0, int base=10 ) const;
    QString arg( short a, int fieldwidth=0, int base=10 ) const;
    QString arg( ushort a, int fieldwidth=0, int base=10 ) const;
    QString arg( char a, int fieldwidth=0 ) const;
    QString arg( QChar a, int fieldwidth=0 ) const;
    QString arg( const QString& a, int fieldwidth=0 ) const;
    QString arg( double a, int fieldwidth=0, char fmt='g', int prec=-1 ) const;

#ifndef QT_NO_SPRINTF
    QString    &sprintf( const char* format, ... )
#if defined(Q_CC_GNU) && !defined(__INSURE__)
        __attribute__ ((format (printf, 2, 3)))
#endif
        ;
#endif

    int         find( QChar c, int index=0, bool cs=TRUE ) const;
    int         find( char c, int index=0, bool cs=TRUE ) const;
    int         find( const QString &str, int index=0, bool cs=TRUE ) const;
#ifndef QT_NO_REGEXP
    int         find( const QRegExp &, int index=0 ) const;
#endif
#ifndef QT_NO_CAST_ASCII
    int         find( const char* str, int index=0 ) const;
#endif
    int         findRev( QChar c, int index=-1, bool cs=TRUE) const;
    int         findRev( char c, int index=-1, bool cs=TRUE) const;
    int         findRev( const QString &str, int index=-1, bool cs=TRUE) const;
#ifndef QT_NO_REGEXP
    int         findRev( const QRegExp &, int index=-1 ) const;
#endif
#ifndef QT_NO_CAST_ASCII
    int         findRev( const char* str, int index=-1 ) const;
#endif
    int         contains( QChar c, bool cs=TRUE ) const;
    int         contains( char c, bool cs=TRUE ) const
                    { return contains(QChar(c), cs); }
#ifndef QT_NO_CAST_ASCII
    int         contains( const char* str, bool cs=TRUE ) const;
#endif
    int         contains( const QString &str, bool cs=TRUE ) const;
#ifndef QT_NO_REGEXP
    int         contains( const QRegExp & ) const;
#endif

    enum SectionFlags {
	SectionDefault             = 0x00,
	SectionSkipEmpty           = 0x01,
	SectionIncludeLeadingSep   = 0x02,
	SectionIncludeTrailingSep  = 0x04,
	SectionCaseInsensitiveSeps = 0x08
    };
    QString     section( QChar sep, int start, int end = 0xffffffff, int flags = SectionDefault ) const;
    QString     section( char sep, int start, int end = 0xffffffff, int flags = SectionDefault ) const;
#ifndef QT_NO_CAST_ASCII
    QString      section( const char *in_sep, int start, int end = 0xffffffff, int flags = SectionDefault ) const;
#endif
    QString     section( const QString &in_sep, int start, int end = 0xffffffff, int flags = SectionDefault ) const;
#ifndef QT_NO_REGEXP
    QString     section( const QRegExp &reg, int start, int end = 0xffffffff, int flags = SectionDefault ) const;
#endif

    QString     left( uint len )  const;
    QString     right( uint len ) const;
    QString     mid( uint index, uint len=0xffffffff) const;

    QString     leftJustify( uint width, QChar fill=' ', bool trunc=FALSE)const;
    QString     rightJustify( uint width, QChar fill=' ',bool trunc=FALSE)const;

    QString     lower() const;
    QString     upper() const;

    QString     stripWhiteSpace()       const;
    QString     simplifyWhiteSpace()    const;

    QString    &insert( uint index, const QString & );
    QString    &insert( uint index, const QChar*, uint len );
    QString    &insert( uint index, QChar );
    QString    &insert( uint index, char c ) { return insert(index,QChar(c)); }
    QString    &append( char );
    QString    &append( QChar );
    QString    &append( const QString & );
    QString    &prepend( char );
    QString    &prepend( QChar );
    QString    &prepend( const QString & );
    QString    &remove( uint index, uint len );
    QString    &replace( uint index, uint len, const QString & );
    QString    &replace( uint index, uint len, const QChar*, uint clen );
#ifndef QT_NO_REGEXP
    QString    &replace( const QRegExp &, const QString & );
#endif
    short       toShort( bool *ok=0, int base=10 )      const;
    ushort      toUShort( bool *ok=0, int base=10 )     const;
    int         toInt( bool *ok=0, int base=10 )        const;
    uint        toUInt( bool *ok=0, int base=10 )       const;
    long        toLong( bool *ok=0, int base=10 )       const;
    ulong       toULong( bool *ok=0, int base=10 )      const;
    float       toFloat( bool *ok=0 )   const;
    double      toDouble( bool *ok=0 )  const;

    QString    &setNum( short, int base=10 );
    QString    &setNum( ushort, int base=10 );
    QString    &setNum( int, int base=10 );
    QString    &setNum( uint, int base=10 );
    QString    &setNum( long, int base=10 );
    QString    &setNum( ulong, int base=10 );
    QString    &setNum( float, char f='g', int prec=6 );
    QString    &setNum( double, char f='g', int prec=6 );

    static QString number( long, int base=10 );
    static QString number( ulong, int base=10);
    static QString number( int, int base=10 );
    static QString number( uint, int base=10);
    static QString number( double, char f='g', int prec=6 );

    void        setExpand( uint index, QChar c );

    QString    &operator+=( const QString &str );
    QString    &operator+=( QChar c );
    QString    &operator+=( char c );

    QChar at( uint i ) const
        { return i < d->len ? d->unicode[i] : QChar::null; }
    QChar operator[]( int i ) const { return at((uint)i); }
    QCharRef at( uint i );
    QCharRef operator[]( int i );

    QChar constref(uint i) const
        { return at(i); }
    QChar& ref(uint i)
        { // Optimized for easy-inlining by simple compilers.
            if ( d->count != 1 || i >= d->len )
                subat( i );
            d->setDirty();
            return d->unicode[i];
        }

    const QChar* unicode() const { return d->unicode; }
    const char* ascii() const { return latin1(); }
    const char* latin1() const;
    static QString fromLatin1(const char*, int len=-1);
#ifndef QT_NO_TEXTCODEC
    QCString utf8() const;
    static QString fromUtf8(const char*, int len=-1);
#endif
    QCString local8Bit() const;
    static QString fromLocal8Bit(const char*, int len=-1);
    bool operator!() const;
#ifndef QT_NO_ASCII_CAST
    operator const char *() const { return latin1(); }
#endif

    QString &setUnicode( const QChar* unicode, uint len );
    QString &setUnicodeCodes( const ushort* unicode_as_ushorts, uint len );
    QString &setLatin1( const char*, int len=-1 );

    int compare( const QString& s ) const;
    static int compare( const QString& s1, const QString& s2 )
    { return s1.compare( s2 ); }

    int localeAwareCompare( const QString& s ) const;
    static int localeAwareCompare( const QString& s1, const QString& s2 )
    { return s1.localeAwareCompare( s2 ); }

#ifndef QT_NO_DATASTREAM
    friend Q_EXPORT QDataStream &operator>>( QDataStream &, QString & );
#endif

    void compose();

#ifndef QT_NO_COMPAT
    const char* data() const { return latin1(); }
#endif

    bool startsWith( const QString& ) const;
    bool endsWith( const QString& ) const;

    void setLength( uint newLength );

    bool simpleText() const { if ( d->dirty ) checkSimpleText(); return (bool)d->simpletext; }
    bool isRightToLeft() const;

private:
    /*
      In Qt 1.0 and 2.0, users could write
      str.replace(QString("foo"), QString("bar")) and "foo" was
      automatically converted into a regexp.

      In Qt 3.0, this gives a compiler error. Users have to write
      QRegExp("foo"). In Qt 3.1 or 4.0, we will move replace() to the
      public API.
    */
    QString& replace( const QString &, const QString & ) { return *this; }

    QString( int size, bool /* dummy */ );	// allocate size incl. \0

    void deref();
    void real_detach();
    void subat( uint );
    bool findArg(int& pos, int& len) const;

    void checkSimpleText() const;

    static QChar* asciiToUnicode( const char*, uint * len, uint maxlen=(uint)-1 );
    static QChar* asciiToUnicode( const QByteArray&, uint * len );
    static char* unicodeToAscii( const QChar*, uint len );

    QStringData *d;
    static QStringData* shared_null;
    static QStringData* makeSharedNull();

    friend class QConstString;
    friend class QTextStream;
    QString( QStringData* dd, bool /* dummy */ ) : d(dd) { }
};

class Q_EXPORT QCharRef {
    friend class QString;
    QString& s;
    uint p;
    QCharRef(QString* str, uint pos) : s(*str), p(pos) { }

public:
    // most QChar operations repeated here...

    // all this is not documented: We just say "like QChar" and let it be.
#ifndef Q_QDOC
    ushort unicode() const { return s.constref(p).unicode(); }
    char latin1() const { return s.constref(p).latin1(); }

    // An operator= for each QChar cast constructor...
    QCharRef operator=(char c ) { s.ref(p)=c; return *this; }
    QCharRef operator=(uchar c ) { s.ref(p)=c; return *this; }
    QCharRef operator=(QChar c ) { s.ref(p)=c; return *this; }
    QCharRef operator=(const QCharRef& c ) { s.ref(p)=c.unicode(); return *this; }
    QCharRef operator=(ushort rc ) { s.ref(p)=rc; return *this; }
    QCharRef operator=(short rc ) { s.ref(p)=rc; return *this; }
    QCharRef operator=(uint rc ) { s.ref(p)=rc; return *this; }
    QCharRef operator=(int rc ) { s.ref(p)=rc; return *this; }

    operator QChar () const { return s.constref(p); }

    // each function...
    bool isNull() const { return unicode()==0; }
    bool isPrint() const { return s.constref(p).isPrint(); }
    bool isPunct() const { return s.constref(p).isPunct(); }
    bool isSpace() const { return s.constref(p).isSpace(); }
    bool isMark() const { return s.constref(p).isMark(); }
    bool isLetter() const { return s.constref(p).isLetter(); }
    bool isNumber() const { return s.constref(p).isNumber(); }
    bool isLetterOrNumber() { return s.constref(p).isLetterOrNumber(); }
    bool isDigit() const { return s.constref(p).isDigit(); }

    int digitValue() const { return s.constref(p).digitValue(); }
    QChar lower() const { return s.constref(p).lower(); }
    QChar upper() const { return s.constref(p).upper(); }

    QChar::Category category() const { return s.constref(p).category(); }
    QChar::Direction direction() const { return s.constref(p).direction(); }
    QChar::Joining joining() const { return s.constref(p).joining(); }
    bool mirrored() const { return s.constref(p).mirrored(); }
    QChar mirroredChar() const { return s.constref(p).mirroredChar(); }
    const QString &decomposition() const { return s.constref(p).decomposition(); }
    QChar::Decomposition decompositionTag() const { return s.constref(p).decompositionTag(); }
    unsigned char combiningClass() const { return s.constref(p).combiningClass(); }

    // Not the non-const ones of these.
    uchar cell() const { return s.constref(p).cell(); }
    uchar row() const { return s.constref(p).row(); }
#endif
};

inline QCharRef QString::at( uint i ) { return QCharRef(this,i); }
inline QCharRef QString::operator[]( int i ) { return at((uint)i); }


class Q_EXPORT QConstString : private QString {
public:
    QConstString( const QChar* unicode, uint length );
    ~QConstString();
    const QString& string() const { return *this; }
};


/*****************************************************************************
  QString stream functions
 *****************************************************************************/
#ifndef QT_NO_DATASTREAM
Q_EXPORT QDataStream &operator<<( QDataStream &, const QString & );
Q_EXPORT QDataStream &operator>>( QDataStream &, QString & );
#endif

/*****************************************************************************
  QString inline functions
 *****************************************************************************/

// These two move code into makeSharedNull() and deletesData()
// to improve cache-coherence (and reduce code bloat), while
// keeping the common cases fast.
//
// No safe way to pre-init shared_null on ALL compilers/linkers.
inline QString::QString() :
    d(shared_null ? shared_null : makeSharedNull())
{
    d->ref();
}
//
inline QString::~QString()
{
    if ( d->deref() ) {
        if ( d == shared_null )
            shared_null = 0;
        d->deleteSelf();
    }
}

inline QString QString::section( QChar sep, int start, int end, int flags ) const
{ return section(QString(sep), start, end, flags); }

inline QString QString::section( char sep, int start, int end, int flags ) const
{ return section(QChar(sep), start, end, flags); }

#ifndef QT_NO_CAST_ASCII
inline QString QString::section( const char *in_sep, int start, int end, int flags ) const
{ return section(QString(in_sep), start, end, flags); }
#endif

inline QString &QString::operator=( QChar c )
{ return *this = QString(c); }

inline QString &QString::operator=( char c )
{ return *this = QString(QChar(c)); }

inline bool QString::isNull() const
{ return unicode() == 0; }

inline bool QString::operator!() const
{ return isNull(); }

inline uint QString::length() const
{ return d->len; }

inline bool QString::isEmpty() const
{ return length() == 0; }

inline QString QString::copy() const
{ return QString( *this ); }

inline QString &QString::prepend( const QString & s )
{ return insert(0,s); }

inline QString &QString::prepend( QChar c )
{ return insert(0,c); }

inline QString &QString::prepend( char c )
{ return insert(0,c); }

inline QString &QString::append( const QString & s )
{ return operator+=(s); }

inline QString &QString::append( QChar c )
{ return operator+=(c); }

inline QString &QString::append( char c )
{ return operator+=(c); }

inline QString &QString::setNum( short n, int base )
{ return setNum((long)n, base); }

inline QString &QString::setNum( ushort n, int base )
{ return setNum((ulong)n, base); }

inline QString &QString::setNum( int n, int base )
{ return setNum((long)n, base); }

inline QString &QString::setNum( uint n, int base )
{ return setNum((ulong)n, base); }

inline QString &QString::setNum( float n, char f, int prec )
{ return setNum((double)n,f,prec); }

inline QString QString::arg(int a, int fieldwidth, int base) const
{ return arg((long)a, fieldwidth, base); }

inline QString QString::arg(uint a, int fieldwidth, int base) const
{ return arg((ulong)a, fieldwidth, base); }

inline QString QString::arg(short a, int fieldwidth, int base) const
{ return arg((long)a, fieldwidth, base); }

inline QString QString::arg(ushort a, int fieldwidth, int base) const
{ return arg((ulong)a, fieldwidth, base); }

inline int QString::find( char c, int index, bool cs ) const
{ return find(QChar(c), index, cs); }

inline int QString::findRev( char c, int index, bool cs) const
{ return findRev( QChar(c), index, cs ); }


#ifndef QT_NO_CAST_ASCII
inline int QString::find( const char* str, int index ) const
{ return find(QString::fromLatin1(str), index); }

inline int QString::findRev( const char* str, int index ) const
{ return findRev(QString::fromLatin1(str), index); }
#endif


/*****************************************************************************
  QString non-member operators
 *****************************************************************************/

Q_EXPORT bool operator!=( const QString &s1, const QString &s2 );
Q_EXPORT bool operator<( const QString &s1, const QString &s2 );
Q_EXPORT bool operator<=( const QString &s1, const QString &s2 );
Q_EXPORT bool operator==( const QString &s1, const QString &s2 );
Q_EXPORT bool operator>( const QString &s1, const QString &s2 );
Q_EXPORT bool operator>=( const QString &s1, const QString &s2 );
#ifndef QT_NO_CAST_ASCII
Q_EXPORT bool operator!=( const QString &s1, const char *s2 );
Q_EXPORT bool operator<( const QString &s1, const char *s2 );
Q_EXPORT bool operator<=( const QString &s1, const char *s2 );
Q_EXPORT bool operator==( const QString &s1, const char *s2 );
Q_EXPORT bool operator>( const QString &s1, const char *s2 );
Q_EXPORT bool operator>=( const QString &s1, const char *s2 );
Q_EXPORT bool operator!=( const char *s1, const QString &s2 );
Q_EXPORT bool operator<( const char *s1, const QString &s2 );
Q_EXPORT bool operator<=( const char *s1, const QString &s2 );
Q_EXPORT bool operator==( const char *s1, const QString &s2 );
//Q_EXPORT bool operator>( const char *s1, const QString &s2 ); // MSVC++
Q_EXPORT bool operator>=( const char *s1, const QString &s2 );
#endif

Q_EXPORT inline const QString operator+( const QString &s1, const QString &s2 )
{
    QString tmp( s1 );
    tmp += s2;
    return tmp;
}

#ifndef QT_NO_CAST_ASCII
Q_EXPORT inline const QString operator+( const QString &s1, const char *s2 )
{
    QString tmp( s1 );
    tmp += QString::fromLatin1(s2);
    return tmp;
}

Q_EXPORT inline const QString operator+( const char *s1, const QString &s2 )
{
    QString tmp = QString::fromLatin1( s1 );
    tmp += s2;
    return tmp;
}
#endif

Q_EXPORT inline const QString operator+( const QString &s1, QChar c2 )
{
    QString tmp( s1 );
    tmp += c2;
    return tmp;
}

Q_EXPORT inline const QString operator+( const QString &s1, char c2 )
{
    QString tmp( s1 );
    tmp += c2;
    return tmp;
}

Q_EXPORT inline const QString operator+( QChar c1, const QString &s2 )
{
    QString tmp;
    tmp += c1;
    tmp += s2;
    return tmp;
}

Q_EXPORT inline const QString operator+( char c1, const QString &s2 )
{
    QString tmp;
    tmp += c1;
    tmp += s2;
    return tmp;
}

#if defined(Q_OS_WIN32)
extern Q_EXPORT QString qt_winQString(void*);
extern Q_EXPORT const void* qt_winTchar(const QString& str, bool addnul);
extern Q_EXPORT void* qt_winTchar_new(const QString& str);
extern Q_EXPORT QCString qt_winQString2MB( const QString& s, int len=-1 );
extern Q_EXPORT QString qt_winMB2QString( const char* mb, int len=-1 );
#endif

#endif // QSTRING_H