QChar(3qt)QChar(3qt)NAMEQChar - Light-weight Unicode character
#include <qstring.h>
Public Members
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 )
enum Category { NoCategory, Mark_NonSpacing,
Mark_SpacingCombining, Mark_Enclosing,
Number_DecimalDigit, Number_Letter, Number_Other,
Separator_Space, Separator_Line, Separator_Paragraph,
Other_Control, Other_Format, Other_Surrogate,
Other_PrivateUse, Other_NotAssigned, Letter_Uppercase,
Letter_Lowercase, Letter_Titlecase, Letter_Modifier,
Letter_Other, Punctuation_Connector, Punctuation_Dask,
Punctuation_Open, Punctuation_Close,
Punctuation_InitialQuote, Punctuation_FinalQuote,
Punctuation_Other, Symbol_Math, Symbol_Currency,
Symbol_Modifier, Symbol_Other }
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 }
int digitValue () const
QChar lower () const
QChar upper () const
Category category () const
Direction direction () const
Joining joining () const
bool mirrored () const
QChar mirroredChar () const
QString decomposition () const
Decomposition decompositionTag () const
char latin1 () const
ushort unicode () const
operator char ()const
bool isNull () const
bool isPrint () const
bool isPunct () const
bool isSpace () const
bool isMark () const
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QChar(3qt)QChar(3qt)
bool isLetter () const
bool isNumber () const
bool isLetterOrNumber () const
bool isDigit () const
uchar& cell ()
uchar& row ()
uchar cell () const
uchar row () const
Static Public Members
bool networkOrdered ()
RELATED FUNCTION DOCUMENTATION
(Note that these are not member functions.)
int operator<= (QChar c, char ch)
int operator>= (QChar c1, QChar c2)
int operator>= (char ch, QChar c)
int operator!= (QChar c, char ch)
int operator>= (QChar c, char ch)
int operator!= (QChar c1, QChar c2)
int operator!= (char ch, QChar c)
int operator<= (QChar c1, QChar c2)
int operator> (char ch, QChar c)
int operator< (QChar c1, QChar c2)
int operator== (QChar c1, QChar c2)
int operator<= (char ch, QChar c)
int operator> (QChar c1, QChar c2)
int operator< (char ch, QChar c)
int operator> (QChar c, char ch)
int operator< (QChar c, char ch)
int operator== (char ch, QChar c)
int operator== (QChar c, char ch)
DESCRIPTION
The QChar class provides a light-weight Unicode character.
Unicode characters are (so far) 16-bit entities without
any markup or structure. This class represents such an
entity. It is rather light-weight, so it can be used
everywhere. Most compilers treat it approximately like
"short int". (In a few years, it may be necessary to make
QChar 32-bit, once more than 65536 Unicode code points
have been defined and come into use.)
QChar provides a full complement of testing/classification
functions, conversion to and from other formats, from
composed to decomposed unicode, and will try to compare
and case-convert if you ask it to.
The classification functions include functions like those
in ctype.h, but operating on the full range of unicode
characters. They all return TRUE if the character is a
certain type of character, and FALSE otherwise.
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QChar(3qt)QChar(3qt)
These functions are: isNull() (returns TRUE if the
character is U+0000), isPrint() (TRUE if the character is
any sort of printable character, including whitespace),
isPunct() (any sort of punctation), isMark() (Unicode
Marks), isLetter (letters), isNumber() (any sort of
numeric characters), isLetterOrNumber(), and isDigit()
(decimal digits). All of these are wrappers around
category(), which returns the unicode-defined category of
each character.
QChar further provides direction(), which indicates the
"natural" writing direction of this character, joining(),
which indicates how this character joins with its
neighbors (needed mostly for Arabic) and finally
mirrored(), which indicates whether this character needs
to be mirrored when it is printed in its unnatural writing
direction.
Composed Unicode characters (like å) can be
converted to decomposed Unicode ("a" followed by "ring
above") using decomposition().
In Unicode, comparison is not necessarily possible, and
case conversion is at best very hard. Unicode, covering
the "entire" globe, also includes a globe-sized collection
of case and sorting problems. Qt tries, but not very hard:
operator== and friends will do comparison based purely on
the numeric Unicode value (code point) of the characters,
and upper() and lower() will do case changes when the
character has a well-defined upper/lower-case equivalent.
There is no provision for locale-dependent case folding
rules or comparison: These functions are meant to be fast,
so they can be used unambiguously in data structures.
The conversion functions include unicode() (to a scalar),
latin1() (to scalar, but converts all non-Latin1
characters to 0), row() (gives the Unicode row), cell()
(gives the unicode cell), digitValue() (gives the integer
value of any of the numerous digit characters), and a host
of constructors.
See also QString, QCharRef and About Unicode
Member Type Documentation
QChar::Category
This enum maps the Unicode character categories. The
currently known categories are:
NoCategory - used when Qt is dazed and confused and cannot
make sense of anything.
Mark_NonSpacing - (Mn) -
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QChar(3qt)QChar(3qt)
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_Dask - (Pd) -
Punctuation_Open - (Ps) -
Punctuation_Close - (Pe) -
Punctuation_InitialQuote - (Pi) -
Punctuation_FinalQuote - (Pf) -
Punctuation_Other - (Po) -
Symbol_Math - (Sm) -
Symbol_Currency - (Sc) -
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QChar(3qt)QChar(3qt)
Symbol_Modifier - (Sk) -
Symbol_Other - (So) -
QChar::Decomposition
This enum type defines the Unicode decomposition
attributes. See the Unicode Standard for a description of
the values.
QChar::Direction
This enum type defines the Unicode direction attributes.
See the Unicode Standard for a description of the values.
In order to conform to C/C++ naming conventions "Dir" is
prepended to the codes used in The Unicode Standard.
QChar::Joining
This enum type defines the Unicode decomposition
attributes. See the Unicode Standard for a description of
the values.
MEMBER FUNCTION DOCUMENTATIONQChar::QChar ()
Constructs a null QChar (one that isNull()).
QChar::QChar ( char c )
Constructs a QChar corresponding to ASCII/Latin1 character
c.
QChar::QChar ( const QChar & c )
Constructs a copy of c. This is a deep copy, if such a
light-weight object can be said to have deep copies.
QChar::QChar ( int rc )
Constructs a QChar for the character with Unicode code
point rc.
QChar::QChar ( short rc )
Constructs a QChar for the character with Unicode code
point rc.
QChar::QChar ( uchar c )
Constructs a QChar corresponding to ASCII/Latin1 character
c.
QChar::QChar ( uchar c, uchar r )
Constructs a QChar for Unicode cell c in row r.
QChar::QChar ( uint rc )
Constructs a QChar for the character with Unicode code
point rc.
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QChar(3qt)QChar(3qt)QChar::QChar ( ushort rc )
Constructs a QChar for the character with Unicode code
point rc.
QChar::operator char () const
Returns the Latin1 character equivalent to the QChar, or
0. This is mainly useful for non-internationalized
software.
See also unicode().
QChar::Category QChar::category() const
Returns the character category.
See also Category.
uchar QChar::cell () const
Returns the cell (least significant byte) of the Unicode
character.
uchar& QChar::cell ()
Returns a reference to the cell (least significant byte)
of the Unicode character.
QString QChar::decomposition () const
Decomposes a character into its parts. Returns
QString::null if no decomposition exists.
QChar::Decomposition QChar::decompositionTag() const
Returns the tag defining the composition of the character.
Returns QChar::Single if no decomposition exists.
int QChar::digitValue () const
Returns the numeric value of the digit, or -1 if the
character is not a digit.
QChar::Direction QChar::direction() const
Returns the characters directionality.
See also Direction.
bool QChar::isDigit () const
Returns whether the character is a decimal digit
(Number_DecimalDigit).
bool QChar::isLetter () const
Returns whether the character is a letter (Letter_*
categories).
bool QChar::isLetterOrNumber () const
Returns whether the character is a letter or number
(Letter_* or Number_* categories).
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QChar(3qt)QChar(3qt)bool QChar::isMark () const
Returns whether the character is a mark (Mark_*
categories).
bool QChar::isNull () const
Returns TRUE if the characters is the unicode character
0x0000, ie. ASCII NUL.
bool QChar::isNumber () const
Returns whether the character is a number (of any sort -
Number_* categories).
See also isDigit().
bool QChar::isPrint () const
Returns whether the character is a printable character.
This is any character not of category Cc or Cn. Note that
this gives no indication of whether the character is
available in some font.
bool QChar::isPunct () const
Returns whether the character is punctuation
(Punctuation_* categories).
bool QChar::isSpace () const
Returns whether the character is a separator character
(Separator_* categories).
QChar::Joining QChar::joining() const
This function is not supported (it may change to use
Unicode character classes).
Returns information about the joining properties of the
character (needed for arabic).
char QChar::latin1 () const
Returns a latin-1 copy of this character, if this
character is in the latin-1 character set. If not, this
function returns 0.
QChar QChar::lower () const
Returns the lowercase equivalent if the character is
uppercase, or the character itself otherwise.
bool QChar::mirrored () const
Returns whether the character is a mirrored character (one
that should be reversed if the text direction is
reversed).
QChar QChar::mirroredChar () const
Returns the mirrored char if this character is a mirrored
char, the char itself otherwise.
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QChar(3qt)QChar(3qt)bool QChar::networkOrdered () [static]
Returns TRUE if this character is in network byte order
(MSB first), and FALSE if it is not. This is a platform-
dependent property, so we strongly advise against using
this function in portable code.
uchar QChar::row () const
Returns the row (most significant byte) of the Unicode
character.
uchar& QChar::row ()
Returns a reference to the row (most significant byte) of
the Unicode character.
ushort QChar::unicode () const
Returns the numeric Unicode value equal to the QChar.
Normally, you should use QChar objects as they are
equivalent, but for some low-level tasks (eg. indexing
into an array of Unicode information), this function is
useful.
QChar QChar::upper () const
Returns the uppercase equivalent if the character is
lowercase, or the character itself otherwise.
RELATED FUNCTION DOCUMENTATIONint operator<;= (QChar c, char ch)
Returns TRUE if the numeric Unicode value of c is less
than or equal to that of the ASCII/Latin1 character ch.
int operator>= (QChar c1, QChar c2)
Returns TRUE if the numeric Unicode value of c1 is greater
than that of c2, or they are the same Unicode character.
int operator>= (char ch, QChar c)
Returns TRUE if the numeric Unicode value of the
ASCII/Latin1 character ch is greater than or equal to that
of c.
int operator!= (QChar c, char ch)
Returns TRUE if c is not the ASCII/Latin1 character ch.
int operator>= (QChar c, char ch)
Returns TRUE if the numeric Unicode value of c is greater
than or equal to that of the ASCII/Latin1 character ch.
int operator!= (QChar c1, QChar c2)
Returns TRUE if c1 and c2 are not the same Unicode
character.
int operator!= (char ch, QChar c)
Returns TRUE if c is not the ASCII/Latin1 character ch.
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QChar(3qt)QChar(3qt)int operator<;= (QChar c1, QChar c2)
Returns TRUE if the numeric Unicode value of c1 is less
than that of c2, or they are the same Unicode character.
int operator> (char ch, QChar c)
Returns TRUE if the numeric Unicode value of the
ASCII/Latin1 character ch is greater than that of c.
int operator<; (QChar c1, QChar c2)
Returns TRUE if the numeric Unicode value of c1 is less
than that of c2.
int operator== (QChar c1, QChar c2)
Returns TRUE if c1 and c2 are the same Unicode character.
int operator<;= (char ch, QChar c)
Returns TRUE if the numeric Unicode value of the
ASCII/Latin1 character ch is less than or equal to that of
c.
int operator> (QChar c1, QChar c2)
Returns TRUE if the numeric Unicode value of c1 is greater
than that of c2.
int operator<; (char ch, QChar c)
Returns TRUE if the numeric Unicode value of the
ASCII/Latin1 character ch is less than that of c.
int operator> (QChar c, char ch)
Returns TRUE if the numeric Unicode value of c is greater
than that of the ASCII/Latin1 character ch.
int operator<; (QChar c, char ch)
Returns TRUE if the numeric Unicode value of c is less
than that of the ASCII/Latin1 character ch.
int operator== (char ch, QChar c)
Returns TRUE if c is the ASCII/Latin1 character ch.
int operator== (QChar c, char ch)
Returns TRUE if c is the ASCII/Latin1 character ch.
SEE ALSO
http://doc.trolltech.com/qchar.html
http://www.trolltech.com/faq/tech.html
COPYRIGHT
Copyright 1992-2001 Trolltech AS,
http://www.trolltech.com. See the license file included
in the distribution for a complete license statement.
AUTHOR
Generated automatically from the source code.
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QChar(3qt)QChar(3qt)BUGS
If you find a bug in Qt, please report it as described in
http://doc.trolltech.com/bughowto.html. Good bug reports
make our job much simpler. Thank you.
In case of content or formattting problems with this
manual page, please report them to qt-bugs@trolltech.com.
Please include the name of the manual page (qchar.3qt) and
the Qt version (2.3.1).
Trolltech AS 13 June 2001 10
