1 files changed, 136 insertions, 0 deletions
diff --git a/src/corelib/doc/snippets/code/src_corelib_kernel_qvariant.cpp b/src/corelib/doc/snippets/code/src_corelib_kernel_qvariant.cpp
new file mode 100644
index 0000000000..ae38c8372f
--- /dev/null
+++ b/src/corelib/doc/snippets/code/src_corelib_kernel_qvariant.cpp
@@ -0,0 +1,136 @@
+/****************************************************************************
+**
+** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/
+**
+** This file is part of the documentation of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** You may use this file under the terms of the BSD license as follows:
+**
+** "Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+**   * Redistributions of source code must retain the above copyright
+**     notice, this list of conditions and the following disclaimer.
+**   * Redistributions in binary form must reproduce the above copyright
+**     notice, this list of conditions and the following disclaimer in
+**     the documentation and/or other materials provided with the
+**     distribution.
+**   * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
+**     the names of its contributors may be used to endorse or promote
+**     products derived from this software without specific prior written
+**     permission.
+**
+** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+//! [0]
+QDataStream out(...);
+QVariant v(123);                // The variant now contains an int
+int x = v.toInt();              // x = 123
+out << v;                       // Writes a type tag and an int to out
+v = QVariant("hello");          // The variant now contains a QByteArray
+v = QVariant(tr("hello"));      // The variant now contains a QString
+int y = v.toInt();              // y = 0 since v cannot be converted to an int
+QString s = v.toString();       // s = tr("hello")  (see QObject::tr())
+out << v;                       // Writes a type tag and a QString to out
+...
+QDataStream in(...);            // (opening the previously written stream)
+in >> v;                        // Reads an Int variant
+int z = v.toInt();              // z = 123
+qDebug("Type is %s",            // prints "Type is int"
+        v.typeName());
+v = v.toInt() + 100;            // The variant now hold the value 223
+v = QVariant(QStringList());
+//! [0]
+
+
+//! [1]
+QVariant x, y(QString()), z(QString(""));
+x.convert(QVariant::Int);
+// x.isNull() == true
+// y.isNull() == true, z.isNull() == false
+//! [1]
+
+
+//! [2]
+QVariant variant;
+...
+QColor color = variant.value<QColor>();
+//! [2]
+
+
+//! [3]
+QColor color = palette().background().color();
+QVariant variant = color;
+//! [3]
+
+
+//! [4]
+QVariant v;
+
+v.setValue(5);
+int i = v.toInt();         // i is now 5
+QString s = v.toString()   // s is now "5"
+
+MyCustomStruct c;
+v.setValue(c);
+
+...
+
+MyCustomStruct c2 = v.value<MyCustomStruct>();
+//! [4]
+
+
+//! [5]
+QVariant v;
+
+MyCustomStruct c;
+if (v.canConvert<MyCustomStruct>())
+    c = v.value<MyCustomStruct>();
+
+v = 7;
+int i = v.value<int>();                        // same as v.toInt()
+QString s = v.value<QString>();                // same as v.toString(), s is now "7"
+MyCustomStruct c2 = v.value<MyCustomStruct>(); // conversion failed, c2 is empty
+//! [5]
+
+
+//! [6]
+QVariant v = 42;
+
+v.canConvert<int>();              // returns true
+v.canConvert<QString>();          // returns true
+
+MyCustomStruct s;
+v.setValue(s);
+
+v.canConvert<int>();              // returns false
+v.canConvert<MyCustomStruct>();   // returns true
+//! [6]
+
+
+//! [7]
+MyCustomStruct s;
+return QVariant::fromValue(s);
+//! [7]
+
+
+//! [8]
+QObject *object = getObjectFromSomewhere();
+QVariant data = QVariant::fromValue(object);
+//! [8]