diff options
Diffstat (limited to 'src/corelib/doc/snippets/code/src_corelib_kernel_qvariant.cpp')
| -rw-r--r-- | src/corelib/doc/snippets/code/src_corelib_kernel_qvariant.cpp | 72 |
1 files changed, 9 insertions, 63 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 index ca1ea21b02..7f3f1ce7a0 100644 --- a/src/corelib/doc/snippets/code/src_corelib_kernel_qvariant.cpp +++ b/src/corelib/doc/snippets/code/src_corelib_kernel_qvariant.cpp @@ -1,59 +1,13 @@ -/**************************************************************************** -** -** Copyright (C) 2016 The Qt Company Ltd. -** Contact: https://www.qt.io/licensing/ -** -** This file is part of the documentation of the Qt Toolkit. -** -** $QT_BEGIN_LICENSE:BSD$ -** Commercial License Usage -** Licensees holding valid commercial Qt licenses may use this file in -** accordance with the commercial license agreement provided with the -** Software or, alternatively, in accordance with the terms contained in -** a written agreement between you and The Qt Company. For licensing terms -** and conditions see https://www.qt.io/terms-conditions. For further -** information use the contact form at https://www.qt.io/contact-us. -** -** BSD License Usage -** Alternatively, 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 The Qt Company Ltd 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." -** -** $QT_END_LICENSE$ -** -****************************************************************************/ +// Copyright (C) 2016 The Qt Company Ltd. +// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause + +#undef QT_NO_FOREACH // this file contains unported legacy Q_FOREACH uses //! [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()) @@ -64,16 +18,13 @@ 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()); +v = v.toInt() + 100; // The variant now holds the value 223 +v = QVariant(QStringList()); // The variant now holds a QStringList //! [0] - //! [1] -QVariant x, y(QString()), z(QString("")); -x.convert(QVariant::Int); -// x.isNull() == true -// y.isNull() == true, z.isNull() == false +QVariant x; // x.isNull() == true +QVariant y = QVariant::fromValue(nullptr); // y.isNull() == true //! [1] @@ -95,7 +46,7 @@ QVariant v; v.setValue(5); int i = v.toInt(); // i is now 5 -QString s = v.toString() // s is now "5" +QString s = v.toString(); // s is now "5" MyCustomStruct c; v.setValue(c); @@ -140,11 +91,6 @@ return QVariant::fromValue(s); //! [7] -//! [8] -QObject *object = getObjectFromSomewhere(); -QVariant data = QVariant::fromValue(object); -//! [8] - //! [9] QList<int> intList = {7, 11, 42}; |