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QChar Class

The QChar class provides a 16-bit Unicode character. More...

Header: #include <QChar>
qmake: QT += core

Note: All functions in this class are reentrant.

Public Types

enum Category { Mark_NonSpacing, Mark_SpacingCombining, Mark_Enclosing, Number_DecimalDigit, ..., Symbol_Other }
enum Decomposition { NoDecomposition, Canonical, Circle, Compat, ..., Wide }
enum Direction { DirAL, DirAN, DirB, DirBN, ..., DirWS }
enum JoiningType { Joining_None, Joining_Causing, Joining_Dual, Joining_Right, Joining_Left, Joining_Transparent }
enum Script { Script_Unknown, Script_Inherited, Script_Common, Script_Latin, ..., Script_ZanabazarSquare }
enum SpecialCharacter { Null, Tabulation, LineFeed, CarriageReturn, ..., LastValidCodePoint }
enum UnicodeVersion { Unicode_1_1, Unicode_2_0, Unicode_2_1_2, Unicode_3_0, ..., Unicode_Unassigned }

Public Functions

QChar(uchar ch)
QChar(char ch)
QChar(wchar_t ch)
QChar(char16_t ch)
QChar(QLatin1Char ch)
QChar(QChar::SpecialCharacter ch)
QChar(int code)
QChar(uint code)
QChar(short code)
QChar(uchar cell, uchar row)
QChar(ushort code)
QChar()
QChar::Category category() const
uchar cell() const
unsigned char combiningClass() const
QString decomposition() const
QChar::Decomposition decompositionTag() const
int digitValue() const
QChar::Direction direction() const
bool hasMirrored() const
bool isDigit() const
bool isHighSurrogate() const
bool isLetter() const
bool isLetterOrNumber() const
bool isLowSurrogate() const
bool isLower() const
bool isMark() const
bool isNonCharacter() const
bool isNull() const
bool isNumber() const
bool isPrint() const
bool isPunct() const
bool isSpace() const
bool isSurrogate() const
bool isSymbol() const
bool isTitleCase() const
bool isUpper() const
QChar::JoiningType joiningType() const
QChar mirroredChar() const
uchar row() const
QChar::Script script() const
QChar toCaseFolded() const
char toLatin1() const
QChar toLower() const
QChar toTitleCase() const
QChar toUpper() const
ushort unicode() const
ushort & unicode()
QChar::UnicodeVersion unicodeVersion() const

Static Public Members

QChar::Category category(uint ucs4)
unsigned char combiningClass(uint ucs4)
QChar::UnicodeVersion currentUnicodeVersion()
QString decomposition(uint ucs4)
QChar::Decomposition decompositionTag(uint ucs4)
int digitValue(uint ucs4)
QChar::Direction direction(uint ucs4)
QChar fromLatin1(char c)
bool hasMirrored(uint ucs4)
ushort highSurrogate(uint ucs4)
bool isDigit(uint ucs4)
bool isHighSurrogate(uint ucs4)
bool isLetter(uint ucs4)
bool isLetterOrNumber(uint ucs4)
bool isLowSurrogate(uint ucs4)
bool isLower(uint ucs4)
bool isMark(uint ucs4)
bool isNonCharacter(uint ucs4)
bool isNumber(uint ucs4)
bool isPrint(uint ucs4)
bool isPunct(uint ucs4)
bool isSpace(uint ucs4)
bool isSurrogate(uint ucs4)
bool isSymbol(uint ucs4)
bool isTitleCase(uint ucs4)
bool isUpper(uint ucs4)
QChar::JoiningType joiningType(uint ucs4)
ushort lowSurrogate(uint ucs4)
uint mirroredChar(uint ucs4)
bool requiresSurrogates(uint ucs4)
QChar::Script script(uint ucs4)
uint surrogateToUcs4(ushort high, ushort low)
uint surrogateToUcs4(QChar high, QChar low)
uint toCaseFolded(uint ucs4)
uint toLower(uint ucs4)
uint toTitleCase(uint ucs4)
uint toUpper(uint ucs4)
QChar::UnicodeVersion unicodeVersion(uint ucs4)
bool operator!=(QChar c1, QChar c2)
bool operator<(QChar c1, QChar c2)
QDataStream & operator<<(QDataStream &out, QChar chr)
bool operator<=(QChar c1, QChar c2)
bool operator==(QChar c1, QChar c2)
bool operator>(QChar c1, QChar c2)
bool operator>=(QChar c1, QChar c2)
QDataStream & operator>>(QDataStream &in, QChar &chr)

Detailed Description

In Qt, Unicode characters are 16-bit entities without any markup or structure. This class represents such an entity. It is lightweight, so it can be used everywhere. Most compilers treat it like an unsigned short.

QChar provides a full complement of testing/classification functions, converting to and from other formats, converting from composed to decomposed Unicode, and trying to compare and case-convert if you ask it to.

The classification functions include functions like those in the standard C++ header <cctype> (formerly <ctype.h>), but operating on the full range of Unicode characters, not just for the ASCII range. They all return true if the character is a certain type of character; otherwise they return false. These classification functions are isNull() (returns true if the character is '\0'), isPrint() (true if the character is any sort of printable character, including whitespace), isPunct() (any sort of punctation), isMark() (Unicode Mark), isLetter() (a letter), isNumber() (any sort of numeric character, not just 0-9), isLetterOrNumber(), and isDigit() (decimal digits). All of these are wrappers around category() which return the Unicode-defined category of each character. Some of these also calculate the derived properties (for example isSpace() returns true if the character is of category Separator_* or an exceptional code point from Other_Control category).

QChar also provides direction(), which indicates the "natural" writing direction of this character. The joiningType() function indicates how the character joins with it's neighbors (needed mostly for Arabic or Syriac) and finally hasMirrored(), which indicates whether the character needs to be mirrored when it is printed in it's "unnatural" writing direction.

Composed Unicode characters (like ring) can be converted to decomposed Unicode ("a" followed by "ring above") by using decomposition().

In Unicode, comparison is not necessarily possible and case conversion is very difficult at best. Unicode, covering the "entire" world, also includes most of the world's case and sorting problems. operator==() and friends will do comparison based purely on the numeric Unicode value (code point) of the characters, and toUpper() and toLower() will do case changes when the character has a well-defined uppercase/lowercase equivalent. For locale-dependent comparisons, use QString::localeAwareCompare().

The conversion functions include unicode() (to a scalar), toLatin1() (to scalar, but converts all non-Latin-1 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.

QChar provides constructors and cast operators that make it easy to convert to and from traditional 8-bit chars. If you defined QT_NO_CAST_FROM_ASCII and QT_NO_CAST_TO_ASCII, as explained in the QString documentation, you will need to explicitly call fromLatin1(), or use QLatin1Char, to construct a QChar from an 8-bit char, and you will need to call toLatin1() to get the 8-bit value back.

For more information see "About the Unicode Character Database".

See also Unicode, QString, and QLatin1Char.

Member Type Documentation

enum QChar::Category

This enum maps the Unicode character categories.

The following characters are normative in Unicode:

Constant Value Description
QChar::Mark_NonSpacing 0 Unicode class name Mn
QChar::Mark_SpacingCombining 1 Unicode class name Mc
QChar::Mark_Enclosing 2 Unicode class name Me
QChar::Number_DecimalDigit 3 Unicode class name Nd
QChar::Number_Letter 4 Unicode class name Nl
QChar::Number_Other 5 Unicode class name No
QChar::Separator_Space 6 Unicode class name Zs
QChar::Separator_Line 7 Unicode class name Zl
QChar::Separator_Paragraph 8 Unicode class name Zp
QChar::Other_Control 9 Unicode class name Cc
QChar::Other_Format 10 Unicode class name Cf
QChar::Other_Surrogate 11 Unicode class name Cs
QChar::Other_PrivateUse 12 Unicode class name Co
QChar::Other_NotAssigned 13 Unicode class name Cn

The following categories are informative in Unicode:

Constant Value Description
QChar::Letter_Uppercase 14 Unicode class name Lu
QChar::Letter_Lowercase 15 Unicode class name Ll
QChar::Letter_Titlecase 16 Unicode class name Lt
QChar::Letter_Modifier 17 Unicode class name Lm
QChar::Letter_Other 18 Unicode class name Lo
QChar::Punctuation_Connector 19 Unicode class name Pc
QChar::Punctuation_Dash 20 Unicode class name Pd
QChar::Punctuation_Open 21 Unicode class name Ps
QChar::Punctuation_Close 22 Unicode class name Pe
QChar::Punctuation_InitialQuote 23 Unicode class name Pi
QChar::Punctuation_FinalQuote 24 Unicode class name Pf
QChar::Punctuation_Other 25 Unicode class name Po
QChar::Symbol_Math 26 Unicode class name Sm
QChar::Symbol_Currency 27 Unicode class name Sc
QChar::Symbol_Modifier 28 Unicode class name Sk
QChar::Symbol_Other 29 Unicode class name So

See also category().

enum QChar::Decomposition

This enum type defines the Unicode decomposition attributes. See the Unicode Standard for a description of the values.

Constant Value
QChar::NoDecomposition 0
QChar::Canonical 1
QChar::Circle 8
QChar::Compat 16
QChar::Final 6
QChar::Font 2
QChar::Fraction 17
QChar::Initial 4
QChar::Isolated 7
QChar::Medial 5
QChar::Narrow 13
QChar::NoBreak 3
QChar::Small 14
QChar::Square 15
QChar::Sub 10
QChar::Super 9
QChar::Vertical 11
QChar::Wide 12

See also decomposition().

enum 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.

Constant Value Description
QChar::DirAL 13
QChar::DirAN 5
QChar::DirB 7
QChar::DirBN 18
QChar::DirCS 6
QChar::DirEN 2
QChar::DirES 3
QChar::DirET 4
QChar::DirFSI 21 Since Qt 5.3
QChar::DirL 0
QChar::DirLRE 11
QChar::DirLRI 19 Since Qt 5.3
QChar::DirLRO 12
QChar::DirNSM 17
QChar::DirON 10
QChar::DirPDF 16
QChar::DirPDI 22 Since Qt 5.3
QChar::DirR 1
QChar::DirRLE 14
QChar::DirRLI 20 Since Qt 5.3
QChar::DirRLO 15
QChar::DirS 8
QChar::DirWS 9

See also direction().

enum QChar::JoiningType

since 5.3

This enum type defines the Unicode joining type attributes. See the Unicode Standard for a description of the values.

In order to conform to C/C++ naming conventions "Joining_" is prepended to the codes used in the Unicode Standard.

Constant Value
QChar::Joining_None 0
QChar::Joining_Causing 1
QChar::Joining_Dual 2
QChar::Joining_Right 3
QChar::Joining_Left 4
QChar::Joining_Transparent 5

See also joiningType().

enum QChar::Script

This enum type defines the Unicode script property values.

For details about the Unicode script property values see Unicode Standard Annex #24.

In order to conform to C/C++ naming conventions "Script_" is prepended to the codes used in the Unicode Standard.

Constant Value Description
QChar::Script_Unknown 0 For unassigned, private-use, noncharacter, and surrogate code points.
QChar::Script_Inherited 1 For characters that may be used with multiple scripts and that inherit their script from the preceding characters. These include nonspacing marks, enclosing marks, and zero width joiner/non-joiner characters.
QChar::Script_Common 2 For characters that may be used with multiple scripts and that do not inherit their script from the preceding characters.
QChar::Script_Latin 3
QChar::Script_Greek 4
QChar::Script_Cyrillic 5
QChar::Script_Armenian 6
QChar::Script_Hebrew 7
QChar::Script_Arabic 8
QChar::Script_Syriac 9
QChar::Script_Thaana 10
QChar::Script_Devanagari 11
QChar::Script_Bengali 12
QChar::Script_Gurmukhi 13
QChar::Script_Gujarati 14
QChar::Script_Oriya 15
QChar::Script_Tamil 16
QChar::Script_Telugu 17
QChar::Script_Kannada 18
QChar::Script_Malayalam 19
QChar::Script_Sinhala 20
QChar::Script_Thai 21
QChar::Script_Lao 22
QChar::Script_Tibetan 23
QChar::Script_Myanmar 24
QChar::Script_Georgian 25
QChar::Script_Hangul 26
QChar::Script_Ethiopic 27
QChar::Script_Cherokee 28
QChar::Script_CanadianAboriginal 29
QChar::Script_Ogham 30
QChar::Script_Runic 31
QChar::Script_Khmer 32
QChar::Script_Mongolian 33
QChar::Script_Hiragana 34
QChar::Script_Katakana 35
QChar::Script_Bopomofo 36
QChar::Script_Han 37
QChar::Script_Yi 38
QChar::Script_OldItalic 39
QChar::Script_Gothic 40
QChar::Script_Deseret 41
QChar::Script_Tagalog 42
QChar::Script_Hanunoo 43
QChar::Script_Buhid 44
QChar::Script_Tagbanwa 45
QChar::Script_Coptic 46
QChar::Script_Limbu 47
QChar::Script_TaiLe 48
QChar::Script_LinearB 49
QChar::Script_Ugaritic 50
QChar::Script_Shavian 51
QChar::Script_Osmanya 52
QChar::Script_Cypriot 53
QChar::Script_Braille 54
QChar::Script_Buginese 55
QChar::Script_NewTaiLue 56
QChar::Script_Glagolitic 57
QChar::Script_Tifinagh 58
QChar::Script_SylotiNagri 59
QChar::Script_OldPersian 60
QChar::Script_Kharoshthi 61
QChar::Script_Balinese 62
QChar::Script_Cuneiform 63
QChar::Script_Phoenician 64
QChar::Script_PhagsPa 65
QChar::Script_Nko 66
QChar::Script_Sundanese 67
QChar::Script_Lepcha 68
QChar::Script_OlChiki 69
QChar::Script_Vai 70
QChar::Script_Saurashtra 71
QChar::Script_KayahLi 72
QChar::Script_Rejang 73
QChar::Script_Lycian 74
QChar::Script_Carian 75
QChar::Script_Lydian 76
QChar::Script_Cham 77
QChar::Script_TaiTham 78
QChar::Script_TaiViet 79
QChar::Script_Avestan 80
QChar::Script_EgyptianHieroglyphs 81
QChar::Script_Samaritan 82
QChar::Script_Lisu 83
QChar::Script_Bamum 84
QChar::Script_Javanese 85
QChar::Script_MeeteiMayek 86
QChar::Script_ImperialAramaic 87
QChar::Script_OldSouthArabian 88
QChar::Script_InscriptionalParthian 89
QChar::Script_InscriptionalPahlavi 90
QChar::Script_OldTurkic 91
QChar::Script_Kaithi 92
QChar::Script_Batak 93
QChar::Script_Brahmi 94
QChar::Script_Mandaic 95
QChar::Script_Chakma 96
QChar::Script_MeroiticCursive 97
QChar::Script_MeroiticHieroglyphs 98
QChar::Script_Miao 99
QChar::Script_Sharada 100
QChar::Script_SoraSompeng 101
QChar::Script_Takri 102
QChar::Script_CaucasianAlbanian 103
QChar::Script_BassaVah 104
QChar::Script_Duployan 105
QChar::Script_Elbasan 106
QChar::Script_Grantha 107
QChar::Script_PahawhHmong 108
QChar::Script_Khojki 109
QChar::Script_LinearA 110
QChar::Script_Mahajani 111
QChar::Script_Manichaean 112
QChar::Script_MendeKikakui 113
QChar::Script_Modi 114
QChar::Script_Mro 115
QChar::Script_OldNorthArabian 116
QChar::Script_Nabataean 117
QChar::Script_Palmyrene 118
QChar::Script_PauCinHau 119
QChar::Script_OldPermic 120
QChar::Script_PsalterPahlavi 121
QChar::Script_Siddham 122
QChar::Script_Khudawadi 123
QChar::Script_Tirhuta 124
QChar::Script_WarangCiti 125
QChar::Script_Ahom 126
QChar::Script_AnatolianHieroglyphs 127
QChar::Script_Hatran 128
QChar::Script_Multani 129
QChar::Script_OldHungarian 130
QChar::Script_SignWriting 131
QChar::Script_Adlam 132
QChar::Script_Bhaiksuki 133
QChar::Script_Marchen 134
QChar::Script_Newa 135
QChar::Script_Osage 136
QChar::Script_Tangut 137
QChar::Script_MasaramGondi 138
QChar::Script_Nushu 139
QChar::Script_Soyombo 140
QChar::Script_ZanabazarSquare 141

This enum was introduced or modified in Qt 5.1.

See also script().

enum QChar::SpecialCharacter

Constant Value Description
QChar::Null 0x0000 A QChar with this value isNull().
QChar::Tabulation 0x0009 Character tabulation.
QChar::LineFeed 0x000a
QChar::CarriageReturn 0x000d
QChar::Space 0x0020
QChar::Nbsp 0x00a0 Non-breaking space.
QChar::SoftHyphen 0x00ad
QChar::ReplacementCharacter 0xfffd The character shown when a font has no glyph for a certain codepoint. A special question mark character is often used. Codecs use this codepoint when input data cannot be represented in Unicode.
QChar::ObjectReplacementCharacter 0xfffc Used to represent an object such as an image when such objects cannot be presented.
QChar::ByteOrderMark 0xfeff
QChar::ByteOrderSwapped 0xfffe
QChar::ParagraphSeparator 0x2029
QChar::LineSeparator 0x2028
QChar::LastValidCodePoint 0x10ffff

enum QChar::UnicodeVersion

Specifies which version of the Unicode standard introduced a certain character.

Constant Value Description
QChar::Unicode_1_1 1 Version 1.1
QChar::Unicode_2_0 2 Version 2.0
QChar::Unicode_2_1_2 3 Version 2.1.2
QChar::Unicode_3_0 4 Version 3.0
QChar::Unicode_3_1 5 Version 3.1
QChar::Unicode_3_2 6 Version 3.2
QChar::Unicode_4_0 7 Version 4.0
QChar::Unicode_4_1 8 Version 4.1
QChar::Unicode_5_0 9 Version 5.0
QChar::Unicode_5_1 10 Version 5.1
QChar::Unicode_5_2 11 Version 5.2
QChar::Unicode_6_0 12 Version 6.0
QChar::Unicode_6_1 13 Version 6.1
QChar::Unicode_6_2 14 Version 6.2
QChar::Unicode_6_3 15 Version 6.3 Since Qt 5.3
QChar::Unicode_7_0 16 Version 7.0 Since Qt 5.5
QChar::Unicode_8_0 17 Version 8.0 Since Qt 5.6
QChar::Unicode_9_0 18 Version 9.0 Since Qt 5.11
QChar::Unicode_10_0 19 Version 10.0 Since Qt 5.11
QChar::Unicode_Unassigned 0 The value is not assigned to any character in version 8.0 of Unicode.

See also unicodeVersion() and currentUnicodeVersion().

Member Function Documentation

QChar::QChar(uchar ch)

Constructs a QChar corresponding to ASCII/Latin-1 character ch.

Note: This constructor is not available when QT_NO_CAST_FROM_ASCII or QT_RESTRICTED_CAST_FROM_ASCII is defined.

See also QT_NO_CAST_FROM_ASCII and QT_RESTRICTED_CAST_FROM_ASCII.

QChar::QChar(char ch)

Constructs a QChar corresponding to ASCII/Latin-1 character ch.

Note: This constructor is not available when QT_NO_CAST_FROM_ASCII is defined.

See also QT_NO_CAST_FROM_ASCII.

QChar::QChar(wchar_t ch)

Constructs a QChar corresponding to the wide character ch.

Note: This constructor is only available on Windows.

This function was introduced in Qt 5.10.

QChar::QChar(char16_t ch)

Constructs a QChar corresponding to the UTF-16 character ch.

This function was introduced in Qt 5.10.

QChar::QChar(QLatin1Char ch)

Constructs a QChar corresponding to ASCII/Latin-1 character ch.

QChar::QChar(QChar::SpecialCharacter ch)

Constructs a QChar for the predefined character value ch.

QChar::QChar(int code)

Constructs a QChar for the character with Unicode code point code.

QChar::QChar(uint code)

Constructs a QChar for the character with Unicode code point code.

QChar::QChar(short code)

Constructs a QChar for the character with Unicode code point code.

QChar::QChar(uchar cell, uchar row)

Constructs a QChar for Unicode cell cell in row row.

See also cell() and row().

QChar::QChar(ushort code)

Constructs a QChar for the character with Unicode code point code.

QChar::QChar()

Constructs a null QChar ('\0').

See also isNull().

QChar::Category QChar::category() const

Returns the character's category.

[static] QChar::Category QChar::category(uint ucs4)

This is an overloaded function.

Returns the category of the UCS-4-encoded character specified by ucs4.

uchar QChar::cell() const

Returns the cell (least significant byte) of the Unicode character.

See also row().

unsigned char QChar::combiningClass() const

Returns the combining class for the character as defined in the Unicode standard. This is mainly useful as a positioning hint for marks attached to a base character.

The Qt text rendering engine uses this information to correctly position non-spacing marks around a base character.

[static] unsigned char QChar::combiningClass(uint ucs4)

This is an overloaded function.

Returns the combining class for the UCS-4-encoded character specified by ucs4, as defined in the Unicode standard.

[static] QChar::UnicodeVersion QChar::currentUnicodeVersion()

Returns the most recent supported Unicode version.

QString QChar::decomposition() const

Decomposes a character into it's constituent parts. Returns an empty string if no decomposition exists.

[static] QString QChar::decomposition(uint ucs4)

This is an overloaded function.

Decomposes the UCS-4-encoded character specified by ucs4 into it's constituent parts. Returns an empty string if no decomposition exists.

QChar::Decomposition QChar::decompositionTag() const

Returns the tag defining the composition of the character. Returns QChar::NoDecomposition if no decomposition exists.

[static] QChar::Decomposition QChar::decompositionTag(uint ucs4)

This is an overloaded function.

Returns the tag defining the composition of the UCS-4-encoded character specified by ucs4. Returns QChar::NoDecomposition if no decomposition exists.

int QChar::digitValue() const

Returns the numeric value of the digit, or -1 if the character is not a digit.

[static] int QChar::digitValue(uint ucs4)

This is an overloaded function.

Returns the numeric value of the digit specified by the UCS-4-encoded character, ucs4, or -1 if the character is not a digit.

QChar::Direction QChar::direction() const

Returns the character's direction.

[static] QChar::Direction QChar::direction(uint ucs4)

This is an overloaded function.

Returns the direction of the UCS-4-encoded character specified by ucs4.

[static] QChar QChar::fromLatin1(char c)

Converts the Latin-1 character c to its equivalent QChar. This is mainly useful for non-internationalized software.

An alternative is to use QLatin1Char.

See also toLatin1() and unicode().

bool QChar::hasMirrored() const

Returns true if the character should be reversed if the text direction is reversed; otherwise returns false.

A bit faster equivalent of (ch.mirroredChar() != ch).

See also mirroredChar().

[static] bool QChar::hasMirrored(uint ucs4)

This is an overloaded function.

Returns true if the UCS-4-encoded character specified by ucs4 should be reversed if the text direction is reversed; otherwise returns false.

A bit faster equivalent of (QChar::mirroredChar(ucs4) != ucs4).

This function was introduced in Qt 5.0.

See also mirroredChar().

[static] ushort QChar::highSurrogate(uint ucs4)

Returns the high surrogate part of a UCS-4-encoded code point. The returned result is undefined if ucs4 is smaller than 0x10000.

bool QChar::isDigit() const

Returns true if the character is a decimal digit (Number_DecimalDigit); otherwise returns false.

See also isNumber().

[static] bool QChar::isDigit(uint ucs4)

This is an overloaded function.

Returns true if the UCS-4-encoded character specified by ucs4 is a decimal digit (Number_DecimalDigit); otherwise returns false.

This function was introduced in Qt 5.0.

See also isNumber().

bool QChar::isHighSurrogate() const

Returns true if the QChar is the high part of a UTF16 surrogate (for example if its code point is in range [0xd800..0xdbff]); false otherwise.

[static] bool QChar::isHighSurrogate(uint ucs4)

This is an overloaded function.

Returns true if the UCS-4-encoded character specified by ucs4 is the high part of a UTF16 surrogate (for example if its code point is in range [0xd800..0xdbff]); false otherwise.

bool QChar::isLetter() const

Returns true if the character is a letter (Letter_* categories); otherwise returns false.

[static] bool QChar::isLetter(uint ucs4)

This is an overloaded function.

Returns true if the UCS-4-encoded character specified by ucs4 is a letter (Letter_* categories); otherwise returns false.

This function was introduced in Qt 5.0.

bool QChar::isLetterOrNumber() const

Returns true if the character is a letter or number (Letter_* or Number_* categories); otherwise returns false.

[static] bool QChar::isLetterOrNumber(uint ucs4)

This is an overloaded function.

Returns true if the UCS-4-encoded character specified by ucs4 is a letter or number (Letter_* or Number_* categories); otherwise returns false.

This function was introduced in Qt 5.0.

bool QChar::isLowSurrogate() const

Returns true if the QChar is the low part of a UTF16 surrogate (for example if its code point is in range [0xdc00..0xdfff]); false otherwise.

[static] bool QChar::isLowSurrogate(uint ucs4)

This is an overloaded function.

Returns true if the UCS-4-encoded character specified by ucs4 is the low part of a UTF16 surrogate (for example if its code point is in range [0xdc00..0xdfff]); false otherwise.

bool QChar::isLower() const

Returns true if the character is a lowercase letter, for example category() is Letter_Lowercase.

See also isUpper(), toLower(), and toUpper().

[static] bool QChar::isLower(uint ucs4)

This is an overloaded function.

Returns true if the UCS-4-encoded character specified by ucs4 is a lowercase letter, for example category() is Letter_Lowercase.

This function was introduced in Qt 5.0.

See also isUpper(), toLower(), and toUpper().

bool QChar::isMark() const

Returns true if the character is a mark (Mark_* categories); otherwise returns false.

See QChar::Category for more information regarding marks.

[static] bool QChar::isMark(uint ucs4)

This is an overloaded function.

Returns true if the UCS-4-encoded character specified by ucs4 is a mark (Mark_* categories); otherwise returns false.

This function was introduced in Qt 5.0.

bool QChar::isNonCharacter() const

Returns true if the QChar is a non-character; false otherwise.

Unicode has a certain number of code points that are classified as "non-characters:" that is, they can be used for internal purposes in applications but cannot be used for text interchange. Those are the last two entries each Unicode Plane ([0xfffe..0xffff], [0x1fffe..0x1ffff], etc.) as well as the entries in range [0xfdd0..0xfdef].

This function was introduced in Qt 5.0.

[static] bool QChar::isNonCharacter(uint ucs4)

This is an overloaded function.

Returns true if the UCS-4-encoded character specified by ucs4 is a non-character; false otherwise.

Unicode has a certain number of code points that are classified as "non-characters:" that is, they can be used for internal purposes in applications but cannot be used for text interchange. Those are the last two entries each Unicode Plane ([0xfffe..0xffff], [0x1fffe..0x1ffff], etc.) as well as the entries in range [0xfdd0..0xfdef].

This function was introduced in Qt 5.0.

bool QChar::isNull() const

Returns true if the character is the Unicode character 0x0000 ('\0'); otherwise returns false.

bool QChar::isNumber() const

Returns true if the character is a number (Number_* categories, not just 0-9); otherwise returns false.

See also isDigit().

[static] bool QChar::isNumber(uint ucs4)

This is an overloaded function.

Returns true if the UCS-4-encoded character specified by ucs4 is a number (Number_* categories, not just 0-9); otherwise returns false.

This function was introduced in Qt 5.0.

See also isDigit().

bool QChar::isPrint() const

Returns true if the character is a printable character; otherwise returns false. This is any character not of category Other_*.

Note that this gives no indication of whether the character is available in a particular font.

[static] bool QChar::isPrint(uint ucs4)

This is an overloaded function.

Returns true if the UCS-4-encoded character specified by ucs4 is a printable character; otherwise returns false. This is any character not of category Other_*.

Note that this gives no indication of whether the character is available in a particular font.

This function was introduced in Qt 5.0.

bool QChar::isPunct() const

Returns true if the character is a punctuation mark (Punctuation_* categories); otherwise returns false.

[static] bool QChar::isPunct(uint ucs4)

This is an overloaded function.

Returns true if the UCS-4-encoded character specified by ucs4 is a punctuation mark (Punctuation_* categories); otherwise returns false.

This function was introduced in Qt 5.0.

bool QChar::isSpace() const

Returns true if the character is a separator character (Separator_* categories or certain code points from Other_Control category); otherwise returns false.

[static] bool QChar::isSpace(uint ucs4)

This is an overloaded function.

Returns true if the UCS-4-encoded character specified by ucs4 is a separator character (Separator_* categories or certain code points from Other_Control category); otherwise returns false.

This function was introduced in Qt 5.0.

bool QChar::isSurrogate() const

Returns true if the QChar contains a code point that is in either the high or the low part of the UTF-16 surrogate range (for example if its code point is in range [0xd800..0xdfff]); false otherwise.

This function was introduced in Qt 5.0.

[static] bool QChar::isSurrogate(uint ucs4)

This is an overloaded function.

Returns true if the UCS-4-encoded character specified by ucs4 contains a code point that is in either the high or the low part of the UTF-16 surrogate range (for example if its code point is in range [0xd800..0xdfff]); false otherwise.

This function was introduced in Qt 5.0.

bool QChar::isSymbol() const

Returns true if the character is a symbol (Symbol_* categories); otherwise returns false.

[static] bool QChar::isSymbol(uint ucs4)

This is an overloaded function.

Returns true if the UCS-4-encoded character specified by ucs4 is a symbol (Symbol_* categories); otherwise returns false.

This function was introduced in Qt 5.0.

bool QChar::isTitleCase() const

Returns true if the character is a titlecase letter, for example category() is Letter_Titlecase.

See also isLower(), toUpper(), toLower(), and toTitleCase().

[static] bool QChar::isTitleCase(uint ucs4)

This is an overloaded function.

Returns true if the UCS-4-encoded character specified by ucs4 is a titlecase letter, for example category() is Letter_Titlecase.

This function was introduced in Qt 5.0.

See also isLower(), toUpper(), toLower(), and toTitleCase().

bool QChar::isUpper() const

Returns true if the character is an uppercase letter, for example category() is Letter_Uppercase.

See also isLower(), toUpper(), and toLower().

[static] bool QChar::isUpper(uint ucs4)

This is an overloaded function.

Returns true if the UCS-4-encoded character specified by ucs4 is an uppercase letter, for example category() is Letter_Uppercase.

This function was introduced in Qt 5.0.

See also isLower(), toUpper(), and toLower().

QChar::JoiningType QChar::joiningType() const

Returns information about the joining type attributes of the character (needed for certain languages such as Arabic or Syriac).

This function was introduced in Qt 5.3.

[static] QChar::JoiningType QChar::joiningType(uint ucs4)

This is an overloaded function.

Returns information about the joining type attributes of the UCS-4-encoded character specified by ucs4 (needed for certain languages such as Arabic or Syriac).

This function was introduced in Qt 5.3.

[static] ushort QChar::lowSurrogate(uint ucs4)

Returns the low surrogate part of a UCS-4-encoded code point. The returned result is undefined if ucs4 is smaller than 0x10000.

QChar QChar::mirroredChar() const

Returns the mirrored character if this character is a mirrored character; otherwise returns the character itself.

See also hasMirrored().

[static] uint QChar::mirroredChar(uint ucs4)

This is an overloaded function.

Returns the mirrored character if the UCS-4-encoded character specified by ucs4 is a mirrored character; otherwise returns the character itself.

See also hasMirrored().

[static] bool QChar::requiresSurrogates(uint ucs4)

Returns true if the UCS-4-encoded character specified by ucs4 can be split into the high and low parts of a UTF16 surrogate (for example if its code point is greater than or equals to 0x10000); false otherwise.

uchar QChar::row() const

Returns the row (most significant byte) of the Unicode character.

See also cell().

QChar::Script QChar::script() const

Returns the Unicode script property value for this character.

This function was introduced in Qt 5.1.

[static] QChar::Script QChar::script(uint ucs4)

This is an overloaded function.

Returns the Unicode script property value for the character specified in its UCS-4-encoded form as ucs4.

This function was introduced in Qt 5.1.

[static] uint QChar::surrogateToUcs4(ushort high, ushort low)

Converts a UTF16 surrogate pair with the given high and low values to it's UCS-4-encoded code point.

[static] uint QChar::surrogateToUcs4(QChar high, QChar low)

This is an overloaded function.

Converts a UTF16 surrogate pair (high, low) to it's UCS-4-encoded code point.

QChar QChar::toCaseFolded() const

Returns the case folded equivalent of the character. For most Unicode characters this is the same as toLower().

[static] uint QChar::toCaseFolded(uint ucs4)

This is an overloaded function.

Returns the case folded equivalent of the UCS-4-encoded character specified by ucs4. For most Unicode characters this is the same as toLower().

char QChar::toLatin1() const

Returns the Latin-1 character equivalent to the QChar, or 0. This is mainly useful for non-internationalized software.

Note: It is not possible to distinguish a non-Latin-1 character from a Latin-1 0 (NUL) character. Prefer to use unicode(), which does not have this ambiguity.

See also unicode().

QChar QChar::toLower() const

Returns the lowercase equivalent if the character is uppercase or titlecase; otherwise returns the character itself.

[static] uint QChar::toLower(uint ucs4)

This is an overloaded function.

Returns the lowercase equivalent of the UCS-4-encoded character specified by ucs4 if the character is uppercase or titlecase; otherwise returns the character itself.

QChar QChar::toTitleCase() const

Returns the title case equivalent if the character is lowercase or uppercase; otherwise returns the character itself.

[static] uint QChar::toTitleCase(uint ucs4)

This is an overloaded function.

Returns the title case equivalent of the UCS-4-encoded character specified by ucs4 if the character is lowercase or uppercase; otherwise returns the character itself.

QChar QChar::toUpper() const

Returns the uppercase equivalent if the character is lowercase or titlecase; otherwise returns the character itself.

[static] uint QChar::toUpper(uint ucs4)

This is an overloaded function.

Returns the uppercase equivalent of the UCS-4-encoded character specified by ucs4 if the character is lowercase or titlecase; otherwise returns the character itself.

ushort QChar::unicode() const

Returns the numeric Unicode value of the QChar.

ushort &QChar::unicode()

Returns a reference to the numeric Unicode value of the QChar.

QChar::UnicodeVersion QChar::unicodeVersion() const

Returns the Unicode version that introduced this character.

[static] QChar::UnicodeVersion QChar::unicodeVersion(uint ucs4)

This is an overloaded function.

Returns the Unicode version that introduced the character specified in its UCS-4-encoded form as ucs4.

Related Non-Members

bool QChar::operator!=(QChar c1, QChar c2)

Returns true if c1 and c2 are not the same Unicode character; otherwise returns false.

bool QChar::operator<(QChar c1, QChar c2)

Returns true if the numeric Unicode value of c1 is less than that of c2; otherwise returns false.

QDataStream &QChar::operator<<(QDataStream &out, QChar chr)

Writes the char chr to the stream out.

See also Serializing Qt Data Types.

bool QChar::operator<=(QChar c1, QChar c2)

Returns true if the numeric Unicode value of c1 is less than or equal to that of c2; otherwise returns false.

bool QChar::operator==(QChar c1, QChar c2)

Returns true if c1 and c2 are the same Unicode character; otherwise returns false.

bool QChar::operator>(QChar c1, QChar c2)

Returns true if the numeric Unicode value of c1 is greater than that of c2; otherwise returns false.

bool QChar::operator>=(QChar c1, QChar c2)

Returns true if the numeric Unicode value of c1 is greater than or equal to that of c2; otherwise returns false.

QDataStream &QChar::operator>>(QDataStream &in, QChar &chr)

Reads a char from the stream in into char chr.

See also Serializing Qt Data Types.

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Licensed under the GNU Free Documentation License, Version 1.3.
https://doc.qt.io/qt-5.13/qchar.html