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<td >Qt 5.9</td><td ><a href="qtcore-index.html">Qt Core</a></td><td >Implicitly Shared Classes</td></tr></table><table class="buildversion"><tr>
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<h1 class="title">Implicitly Shared Classes</h1>
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<p>These <a href="qtcore-index.html">Qt Core</a> classes provides a safe and efficient way of sharing and manipulating data by <a href="implicit-sharing.html">implicitly sharing</a> data.</p>
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<tr class="odd topAlign"><td class="tblName"><p><a href="qdebug.html">QDebug</a></p></td><td class="tblDescr"><p>Output stream for debugging information</p></td></tr>
<tr class="even topAlign"><td class="tblName"><p><a href="qdir.html">QDir</a></p></td><td class="tblDescr"><p>Access to directory structures and their contents</p></td></tr>
<tr class="odd topAlign"><td class="tblName"><p><a href="qfileinfo.html">QFileInfo</a></p></td><td class="tblDescr"><p>System-independent file information</p></td></tr>
<tr class="even topAlign"><td class="tblName"><p><a href="qprocessenvironment.html">QProcessEnvironment</a></p></td><td class="tblDescr"><p>Holds the environment variables that can be passed to a program</p></td></tr>
<tr class="odd topAlign"><td class="tblName"><p><a href="qstorageinfo.html">QStorageInfo</a></p></td><td class="tblDescr"><p>Provides information about currently mounted storage and drives</p></td></tr>
<tr class="even topAlign"><td class="tblName"><p><a href="qurl.html">QUrl</a></p></td><td class="tblDescr"><p>Convenient interface for working with URLs</p></td></tr>
<tr class="odd topAlign"><td class="tblName"><p><a href="qurlquery.html">QUrlQuery</a></p></td><td class="tblDescr"><p>Way to manipulate a key-value pairs in a URL's query</p></td></tr>
<tr class="even topAlign"><td class="tblName"><p><a href="qpersistentmodelindex.html">QPersistentModelIndex</a></p></td><td class="tblDescr"><p>Used to locate data in a data model</p></td></tr>
<tr class="odd topAlign"><td class="tblName"><p><a href="qjsonarray.html">QJsonArray</a></p></td><td class="tblDescr"><p>Encapsulates a JSON array</p></td></tr>
<tr class="even topAlign"><td class="tblName"><p><a href="qjsondocument.html">QJsonDocument</a></p></td><td class="tblDescr"><p>Way to read and write JSON documents</p></td></tr>
<tr class="odd topAlign"><td class="tblName"><p><a href="qjsonparseerror.html">QJsonParseError</a></p></td><td class="tblDescr"><p>Used to report errors during JSON parsing</p></td></tr>
<tr class="even topAlign"><td class="tblName"><p><a href="qjsonobject.html">QJsonObject</a></p></td><td class="tblDescr"><p>Encapsulates a JSON object</p></td></tr>
<tr class="odd topAlign"><td class="tblName"><p><a href="qjsonvalue.html">QJsonValue</a></p></td><td class="tblDescr"><p>Encapsulates a value in JSON</p></td></tr>
<tr class="even topAlign"><td class="tblName"><p><a href="qvariant.html">QVariant</a></p></td><td class="tblDescr"><p>Acts like a union for the most common Qt data types</p></td></tr>
<tr class="odd topAlign"><td class="tblName"><p><a href="qmimetype.html">QMimeType</a></p></td><td class="tblDescr"><p>Describes types of file or data, represented by a MIME type string</p></td></tr>
<tr class="even topAlign"><td class="tblName"><p><a href="qbitarray.html">QBitArray</a></p></td><td class="tblDescr"><p>Array of bits</p></td></tr>
<tr class="odd topAlign"><td class="tblName"><p><a href="qbytearray.html">QByteArray</a></p></td><td class="tblDescr"><p>Array of bytes</p></td></tr>
<tr class="even topAlign"><td class="tblName"><p><a href="qbytearraylist.html">QByteArrayList</a></p></td><td class="tblDescr"><p>List of byte arrays</p></td></tr>
<tr class="odd topAlign"><td class="tblName"><p><a href="qcache.html">QCache</a></p></td><td class="tblDescr"><p>Template class that provides a cache</p></td></tr>
<tr class="even topAlign"><td class="tblName"><p><a href="qcollator.html">QCollator</a></p></td><td class="tblDescr"><p>Compares strings according to a localized collation algorithm</p></td></tr>
<tr class="odd topAlign"><td class="tblName"><p><a href="qcollatorsortkey.html">QCollatorSortKey</a></p></td><td class="tblDescr"><p>Can be used to speed up string collation</p></td></tr>
<tr class="even topAlign"><td class="tblName"><p><a href="qcommandlineoption.html">QCommandLineOption</a></p></td><td class="tblDescr"><p>Defines a possible command-line option</p></td></tr>
<tr class="odd topAlign"><td class="tblName"><p><a href="qcontiguouscache.html">QContiguousCache</a></p></td><td class="tblDescr"><p>Template class that provides a contiguous cache</p></td></tr>
<tr class="even topAlign"><td class="tblName"><p><a href="qdatetime.html">QDateTime</a></p></td><td class="tblDescr"><p>Date and time functions</p></td></tr>
<tr class="odd topAlign"><td class="tblName"><p><a href="qhash.html">QHash</a></p></td><td class="tblDescr"><p>Template class that provides a hash-table-based dictionary</p></td></tr>
<tr class="even topAlign"><td class="tblName"><p><a href="qmultihash.html">QMultiHash</a></p></td><td class="tblDescr"><p>Convenience QHash subclass that provides multi-valued hashes</p></td></tr>
<tr class="odd topAlign"><td class="tblName"><p><a href="qlinkedlist.html">QLinkedList</a></p></td><td class="tblDescr"><p>Template class that provides linked lists</p></td></tr>
<tr class="even topAlign"><td class="tblName"><p><a href="qlist.html">QList</a></p></td><td class="tblDescr"><p>Template class that provides lists</p></td></tr>
<tr class="odd topAlign"><td class="tblName"><p><a href="qlocale.html">QLocale</a></p></td><td class="tblDescr"><p>Converts between numbers and their string representations in various languages</p></td></tr>
<tr class="even topAlign"><td class="tblName"><p><a href="qmap.html">QMap</a></p></td><td class="tblDescr"><p>Template class that provides a red-black-tree-based dictionary</p></td></tr>
<tr class="odd topAlign"><td class="tblName"><p><a href="qmultimap.html">QMultiMap</a></p></td><td class="tblDescr"><p>Convenience QMap subclass that provides multi-valued maps</p></td></tr>
<tr class="even topAlign"><td class="tblName"><p><a href="qqueue.html">QQueue</a></p></td><td class="tblDescr"><p>Generic container that provides a queue</p></td></tr>
<tr class="odd topAlign"><td class="tblName"><p><a href="qregexp.html">QRegExp</a></p></td><td class="tblDescr"><p>Pattern matching using regular expressions</p></td></tr>
<tr class="even topAlign"><td class="tblName"><p><a href="qregularexpression.html">QRegularExpression</a></p></td><td class="tblDescr"><p>Pattern matching using regular expressions</p></td></tr>
<tr class="odd topAlign"><td class="tblName"><p><a href="qregularexpressionmatch.html">QRegularExpressionMatch</a></p></td><td class="tblDescr"><p>The results of a matching a QRegularExpression against a string</p></td></tr>
<tr class="even topAlign"><td class="tblName"><p><a href="qregularexpressionmatchiterator.html">QRegularExpressionMatchIterator</a></p></td><td class="tblDescr"><p>Iterator on the results of a global match of a QRegularExpression object against a string</p></td></tr>
<tr class="odd topAlign"><td class="tblName"><p><a href="qset.html">QSet</a></p></td><td class="tblDescr"><p>Template class that provides a hash-table-based set</p></td></tr>
<tr class="even topAlign"><td class="tblName"><p><a href="qstack.html">QStack</a></p></td><td class="tblDescr"><p>Template class that provides a stack</p></td></tr>
<tr class="odd topAlign"><td class="tblName"><p><a href="qstring.html">QString</a></p></td><td class="tblDescr"><p>Unicode character string</p></td></tr>
<tr class="even topAlign"><td class="tblName"><p><a href="qstringlist.html">QStringList</a></p></td><td class="tblDescr"><p>List of strings</p></td></tr>
<tr class="odd topAlign"><td class="tblName"><p><a href="qtextboundaryfinder.html">QTextBoundaryFinder</a></p></td><td class="tblDescr"><p>Way of finding Unicode text boundaries in a string</p></td></tr>
<tr class="even topAlign"><td class="tblName"><p><a href="qvector.html">QVector</a></p></td><td class="tblDescr"><p>Template class that provides a dynamic array</p></td></tr>
<tr class="odd topAlign"><td class="tblName"><p><a href="../qtdbus/qdbuspendingcall.html">QDBusPendingCall</a></p></td><td class="tblDescr"><p>Refers to one pending asynchronous call</p></td></tr>
<tr class="even topAlign"><td class="tblName"><p><a href="../qtdbus/qdbusunixfiledescriptor.html">QDBusUnixFileDescriptor</a></p></td><td class="tblDescr"><p>Holds one Unix file descriptor</p></td></tr>
<tr class="odd topAlign"><td class="tblName"><p><a href="../qtgui/qbitmap.html">QBitmap</a></p></td><td class="tblDescr"><p>Monochrome (1-bit depth) pixmaps</p></td></tr>
<tr class="even topAlign"><td class="tblName"><p><a href="../qtgui/qicon.html">QIcon</a></p></td><td class="tblDescr"><p>Scalable icons in different modes and states</p></td></tr>
<tr class="odd topAlign"><td class="tblName"><p><a href="../qtgui/qimage.html">QImage</a></p></td><td class="tblDescr"><p>Hardware-independent image representation that allows direct access to the pixel data, and can be used as a paint device</p></td></tr>
<tr class="even topAlign"><td class="tblName"><p><a href="../qtgui/qpicture.html">QPicture</a></p></td><td class="tblDescr"><p>Paint device that records and replays QPainter commands</p></td></tr>
<tr class="odd topAlign"><td class="tblName"><p><a href="../qtgui/qpixmap.html">QPixmap</a></p></td><td class="tblDescr"><p>Off-screen image representation that can be used as a paint device</p></td></tr>
<tr class="even topAlign"><td class="tblName"><p><a href="../qtgui/qcursor.html">QCursor</a></p></td><td class="tblDescr"><p>Mouse cursor with an arbitrary shape</p></td></tr>
<tr class="odd topAlign"><td class="tblName"><p><a href="../qtgui/qkeysequence.html">QKeySequence</a></p></td><td class="tblDescr"><p>Encapsulates a key sequence as used by shortcuts</p></td></tr>
<tr class="even topAlign"><td class="tblName"><p><a href="../qtgui/qpalette.html">QPalette</a></p></td><td class="tblDescr"><p>Contains color groups for each widget state</p></td></tr>
<tr class="odd topAlign"><td class="tblName"><p><a href="../qtgui/qopengldebugmessage.html">QOpenGLDebugMessage</a></p></td><td class="tblDescr"><p>Wraps an OpenGL debug message</p></td></tr>
<tr class="even topAlign"><td class="tblName"><p><a href="../qtgui/qbrush.html">QBrush</a></p></td><td class="tblDescr"><p>Defines the fill pattern of shapes drawn by QPainter</p></td></tr>
<tr class="odd topAlign"><td class="tblName"><p><a href="../qtgui/qgradient.html">QGradient</a></p></td><td class="tblDescr"><p>Used in combination with QBrush to specify gradient fills</p></td></tr>
<tr class="even topAlign"><td class="tblName"><p><a href="../qtgui/qpainterpath.html">QPainterPath</a></p></td><td class="tblDescr"><p>Container for painting operations, enabling graphical shapes to be constructed and reused</p></td></tr>
<tr class="odd topAlign"><td class="tblName"><p><a href="../qtgui/qpen.html">QPen</a></p></td><td class="tblDescr"><p>Defines how a QPainter should draw lines and outlines of shapes</p></td></tr>
<tr class="even topAlign"><td class="tblName"><p><a href="../qtgui/qpolygon.html">QPolygon</a></p></td><td class="tblDescr"><p>Vector of points using integer precision</p></td></tr>
<tr class="odd topAlign"><td class="tblName"><p><a href="../qtgui/qpolygonf.html">QPolygonF</a></p></td><td class="tblDescr"><p>Vector of points using floating point precision</p></td></tr>
<tr class="even topAlign"><td class="tblName"><p><a href="../qtgui/qregion.html">QRegion</a></p></td><td class="tblDescr"><p>Specifies a clip region for a painter</p></td></tr>
<tr class="odd topAlign"><td class="tblName"><p><a href="../qtgui/qfont.html">QFont</a></p></td><td class="tblDescr"><p>Specifies a font used for drawing text</p></td></tr>
<tr class="even topAlign"><td class="tblName"><p><a href="../qtgui/qfontinfo.html">QFontInfo</a></p></td><td class="tblDescr"><p>General information about fonts</p></td></tr>
<tr class="odd topAlign"><td class="tblName"><p><a href="../qtgui/qfontmetrics.html">QFontMetrics</a></p></td><td class="tblDescr"><p>Font metrics information</p></td></tr>
<tr class="even topAlign"><td class="tblName"><p><a href="../qtgui/qfontmetricsf.html">QFontMetricsF</a></p></td><td class="tblDescr"><p>Font metrics information</p></td></tr>
<tr class="odd topAlign"><td class="tblName"><p><a href="../qtgui/qglyphrun.html">QGlyphRun</a></p></td><td class="tblDescr"><p>Direct access to the internal glyphs in a font</p></td></tr>
<tr class="even topAlign"><td class="tblName"><p><a href="../qtgui/qrawfont.html">QRawFont</a></p></td><td class="tblDescr"><p>Access to a single physical instance of a font</p></td></tr>
<tr class="odd topAlign"><td class="tblName"><p><a href="../qtgui/qstatictext.html">QStaticText</a></p></td><td class="tblDescr"><p>Enables optimized drawing of text when the text and its layout is updated rarely</p></td></tr>
<tr class="even topAlign"><td class="tblName"><p><a href="../qtgui/qtextcursor.html">QTextCursor</a></p></td><td class="tblDescr"><p>Offers an API to access and modify QTextDocuments</p></td></tr>
<tr class="odd topAlign"><td class="tblName"><p><a href="../qtgui/qtextdocumentfragment.html">QTextDocumentFragment</a></p></td><td class="tblDescr"><p>Represents a piece of formatted text from a QTextDocument</p></td></tr>
<tr class="even topAlign"><td class="tblName"><p><a href="../qtgui/qtextblockformat.html">QTextBlockFormat</a></p></td><td class="tblDescr"><p>Formatting information for blocks of text in a QTextDocument</p></td></tr>
<tr class="odd topAlign"><td class="tblName"><p><a href="../qtgui/qtextcharformat.html">QTextCharFormat</a></p></td><td class="tblDescr"><p>Formatting information for characters in a QTextDocument</p></td></tr>
<tr class="even topAlign"><td class="tblName"><p><a href="../qtgui/qtextformat.html">QTextFormat</a></p></td><td class="tblDescr"><p>Formatting information for a QTextDocument</p></td></tr>
<tr class="odd topAlign"><td class="tblName"><p><a href="../qtgui/qtextframeformat.html">QTextFrameFormat</a></p></td><td class="tblDescr"><p>Formatting information for frames in a QTextDocument</p></td></tr>
<tr class="even topAlign"><td class="tblName"><p><a href="../qtgui/qtextimageformat.html">QTextImageFormat</a></p></td><td class="tblDescr"><p>Formatting information for images in a QTextDocument</p></td></tr>
<tr class="odd topAlign"><td class="tblName"><p><a href="../qtgui/qtextlistformat.html">QTextListFormat</a></p></td><td class="tblDescr"><p>Formatting information for lists in a QTextDocument</p></td></tr>
<tr class="even topAlign"><td class="tblName"><p><a href="../qtgui/qtexttablecellformat.html">QTextTableCellFormat</a></p></td><td class="tblDescr"><p>Formatting information for table cells in a QTextDocument</p></td></tr>
<tr class="odd topAlign"><td class="tblName"><p><a href="../qtgui/qtexttableformat.html">QTextTableFormat</a></p></td><td class="tblDescr"><p>Formatting information for tables in a QTextDocument</p></td></tr>
<tr class="even topAlign"><td class="tblName"><p><a href="../qtnetwork/qnetworkcachemetadata.html">QNetworkCacheMetaData</a></p></td><td class="tblDescr"><p>Cache information</p></td></tr>
<tr class="odd topAlign"><td class="tblName"><p><a href="../qtnetwork/qhttppart.html">QHttpPart</a></p></td><td class="tblDescr"><p>Holds a body part to be used inside a HTTP multipart MIME message</p></td></tr>
<tr class="even topAlign"><td class="tblName"><p><a href="../qtnetwork/qnetworkcookie.html">QNetworkCookie</a></p></td><td class="tblDescr"><p>Holds one network cookie</p></td></tr>
<tr class="odd topAlign"><td class="tblName"><p><a href="../qtnetwork/qnetworkrequest.html">QNetworkRequest</a></p></td><td class="tblDescr"><p>Holds a request to be sent with QNetworkAccessManager</p></td></tr>
<tr class="even topAlign"><td class="tblName"><p><a href="../qtnetwork/qnetworkconfiguration.html">QNetworkConfiguration</a></p></td><td class="tblDescr"><p>Abstraction of one or more access point configurations</p></td></tr>
<tr class="odd topAlign"><td class="tblName"><p><a href="../qtnetwork/qdnsdomainnamerecord.html">QDnsDomainNameRecord</a></p></td><td class="tblDescr"><p>Stores information about a domain name record</p></td></tr>
<tr class="even topAlign"><td class="tblName"><p><a href="../qtnetwork/qdnshostaddressrecord.html">QDnsHostAddressRecord</a></p></td><td class="tblDescr"><p>Stores information about a host address record</p></td></tr>
<tr class="odd topAlign"><td class="tblName"><p><a href="../qtnetwork/qdnsmailexchangerecord.html">QDnsMailExchangeRecord</a></p></td><td class="tblDescr"><p>Stores information about a DNS MX record</p></td></tr>
<tr class="even topAlign"><td class="tblName"><p><a href="../qtnetwork/qdnsservicerecord.html">QDnsServiceRecord</a></p></td><td class="tblDescr"><p>Stores information about a DNS SRV record</p></td></tr>
<tr class="odd topAlign"><td class="tblName"><p><a href="../qtnetwork/qdnstextrecord.html">QDnsTextRecord</a></p></td><td class="tblDescr"><p>Stores information about a DNS TXT record</p></td></tr>
<tr class="even topAlign"><td class="tblName"><p><a href="../qtnetwork/qhostaddress.html">QHostAddress</a></p></td><td class="tblDescr"><p>IP address</p></td></tr>
<tr class="odd topAlign"><td class="tblName"><p><a href="../qtnetwork/qnetworkaddressentry.html">QNetworkAddressEntry</a></p></td><td class="tblDescr"><p>Stores one IP address supported by a network interface, along with its associated netmask and broadcast address</p></td></tr>
<tr class="even topAlign"><td class="tblName"><p><a href="../qtnetwork/qnetworkinterface.html">QNetworkInterface</a></p></td><td class="tblDescr"><p>Listing of the host's IP addresses and network interfaces</p></td></tr>
<tr class="odd topAlign"><td class="tblName"><p><a href="../qtnetwork/qnetworkproxy.html">QNetworkProxy</a></p></td><td class="tblDescr"><p>Network layer proxy</p></td></tr>
<tr class="even topAlign"><td class="tblName"><p><a href="../qtnetwork/qnetworkproxyquery.html">QNetworkProxyQuery</a></p></td><td class="tblDescr"><p>Used to query the proxy settings for a socket</p></td></tr>
<tr class="odd topAlign"><td class="tblName"><p><a href="../qtnetwork/qsslcertificate.html">QSslCertificate</a></p></td><td class="tblDescr"><p>Convenient API for an X509 certificate</p></td></tr>
<tr class="even topAlign"><td class="tblName"><p><a href="../qtnetwork/qsslcertificateextension.html">QSslCertificateExtension</a></p></td><td class="tblDescr"><p>API for accessing the extensions of an X509 certificate</p></td></tr>
<tr class="odd topAlign"><td class="tblName"><p><a href="../qtnetwork/qsslcipher.html">QSslCipher</a></p></td><td class="tblDescr"><p>Represents an SSL cryptographic cipher</p></td></tr>
<tr class="even topAlign"><td class="tblName"><p><a href="../qtnetwork/qsslconfiguration.html">QSslConfiguration</a></p></td><td class="tblDescr"><p>Holds the configuration and state of an SSL connection</p></td></tr>
<tr class="odd topAlign"><td class="tblName"><p><a href="../qtnetwork/qssldiffiehellmanparameters.html">QSslDiffieHellmanParameters</a></p></td><td class="tblDescr"><p>Interface for Diffie-Hellman parameters for servers</p></td></tr>
<tr class="even topAlign"><td class="tblName"><p><a href="../qtnetwork/qsslerror.html">QSslError</a></p></td><td class="tblDescr"><p>SSL error</p></td></tr>
<tr class="odd topAlign"><td class="tblName"><p><a href="../qtnetwork/qsslkey.html">QSslKey</a></p></td><td class="tblDescr"><p>Interface for private and public keys</p></td></tr>
<tr class="even topAlign"><td class="tblName"><p><a href="../qtnetwork/qsslpresharedkeyauthenticator.html">QSslPreSharedKeyAuthenticator</a></p></td><td class="tblDescr"><p>Authentication data for pre shared keys (PSK) ciphersuites</p></td></tr>
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