diff options
Diffstat (limited to 'src/corelib/doc/snippets/code/src_corelib_tools_qmap.cpp')
| -rw-r--r-- | src/corelib/doc/snippets/code/src_corelib_tools_qmap.cpp | 210 |
1 files changed, 36 insertions, 174 deletions
diff --git a/src/corelib/doc/snippets/code/src_corelib_tools_qmap.cpp b/src/corelib/doc/snippets/code/src_corelib_tools_qmap.cpp index 145cd10d84..5f87211968 100644 --- a/src/corelib/doc/snippets/code/src_corelib_tools_qmap.cpp +++ b/src/corelib/doc/snippets/code/src_corelib_tools_qmap.cpp @@ -1,52 +1,5 @@ -/**************************************************************************** -** -** 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 //! [0] QMap<QString, int> map; @@ -89,7 +42,7 @@ QMap<int, QWidget *> map; ... for (int i = 0; i < 1000; ++i) { if (map[i] == okButton) - cout << "Found button at index " << i << Qt::endl; + cout << "Found button at index " << i << endl; } //! [6] @@ -98,17 +51,14 @@ for (int i = 0; i < 1000; ++i) { QMapIterator<QString, int> i(map); while (i.hasNext()) { i.next(); - cout << i.key() << ": " << i.value() << Qt::endl; + cout << qPrintable(i.key()) << ": " << i.value() << endl; } //! [7] //! [8] -QMap<QString, int>::const_iterator i = map.constBegin(); -while (i != map.constEnd()) { - cout << i.key() << ": " << i.value() << Qt::endl; - ++i; -} +for (auto i = map.cbegin(), end = map.cend(); i != end; ++i) + cout << qPrintable(i.key()) << ": " << i.value() << endl; //! [8] @@ -119,27 +69,11 @@ map.insert("plenty", 2000); //! [9] -//! [10] -QList<int> values = map.values("plenty"); -for (int i = 0; i < values.size(); ++i) - cout << values.at(i) << Qt::endl; -//! [10] - - -//! [11] -QMap<QString, int>::iterator i = map.find("plenty"); -while (i != map.end() && i.key() == "plenty") { - cout << i.value() << Qt::endl; - ++i; -} -//! [11] - - //! [12] QMap<QString, int> map; ... -foreach (int value, map) - cout << value << Qt::endl; +for (int value : std::as_const(map)) + cout << value << endl; //! [12] @@ -170,43 +104,6 @@ inline bool operator<(const Employee &e1, const Employee &e2) //! [13] -//! [14] -QMap<QString, int> map; -... -QMap<QString, int>::const_iterator i = map.find("HDR"); -while (i != map.end() && i.key() == "HDR") { - cout << i.value() << Qt::endl; - ++i; -} -//! [14] - - -//! [15] -QMap<int, QString> map; -map.insert(1, "one"); -map.insert(5, "five"); -map.insert(10, "ten"); - -map.lowerBound(0); // returns iterator to (1, "one") -map.lowerBound(1); // returns iterator to (1, "one") -map.lowerBound(2); // returns iterator to (5, "five") -map.lowerBound(10); // returns iterator to (10, "ten") -map.lowerBound(999); // returns end() -//! [15] - - -//! [16] -QMap<QString, int> map; -... -QMap<QString, int>::const_iterator i = map.lowerBound("HDR"); -QMap<QString, int>::const_iterator upperBound = map.upperBound("HDR"); -while (i != upperBound) { - cout << i.value() << Qt::endl; - ++i; -} -//! [16] - - //! [17] QMap<int, QString> map; map.insert(1, "one"); @@ -228,50 +125,33 @@ map.insert("February", 2); ... map.insert("December", 12); -QMap<QString, int>::iterator i; -for (i = map.begin(); i != map.end(); ++i) - cout << i.key() << ": " << i.value() << Qt::endl; +for (auto i = map.cbegin(), end = map.cend(); i != end; ++i) + cout << qPrintable(i.key()) << ": " << i.value() << endl; //! [18] //! [19] -QMap<QString, int>::iterator i; -for (i = map.begin(); i != map.end(); ++i) +for (auto i = map.begin(), end = map.end(); i != end; ++i) i.value() += 2; //! [19] +void erase() +{ +QMap<QString, int> map; //! [20] -QMap<QString, int>::iterator i = map.begin(); -while (i != map.end()) { - if (i.key().startsWith('_')) +QMap<QString, int>::const_iterator i = map.cbegin(); +while (i != map.cend()) { + if (i.value() > 10) i = map.erase(i); else ++i; } //! [20] - - //! [21] -QMap<QString, int>::iterator i = map.begin(); -while (i != map.end()) { - QMap<QString, int>::iterator prev = i; - ++i; - if (prev.key().startsWith('_')) - map.erase(prev); -} +erase_if(map, [](const QMap<QString, int>::iterator it) { return it.value() > 10; }); //! [21] - - -//! [22] -// WRONG -while (i != map.end()) { - if (i.key().startsWith('_')) - map.erase(i); - ++i; } -//! [22] - //! [23] if (i.key() == "Hello") @@ -286,47 +166,16 @@ map.insert("February", 2); ... map.insert("December", 12); -QMap<QString, int>::const_iterator i; -for (i = map.constBegin(); i != map.constEnd(); ++i) - cout << i.key() << ": " << i.value() << Qt::endl; +for (auto i = map.cbegin(), end = map.cend(); i != end; ++i) + cout << qPrintable(i.key()) << ": " << i.value() << endl; //! [24] -//! [25] -QMultiMap<QString, int> map1, map2, map3; - -map1.insert("plenty", 100); -map1.insert("plenty", 2000); -// map1.size() == 2 - -map2.insert("plenty", 5000); -// map2.size() == 1 - -map3 = map1 + map2; -// map3.size() == 3 -//! [25] - - -//! [26] -QList<int> values = map.values("plenty"); -for (int i = 0; i < values.size(); ++i) - cout << values.at(i) << Qt::endl; -//! [26] - - -//! [27] -QMultiMap<QString, int>::iterator i = map.find("plenty"); -while (i != map.end() && i.key() == "plenty") { - cout << i.value() << Qt::endl; - ++i; -} -//! [27] - //! [keyiterator1] for (QMap<int, QString>::const_iterator it = map.cbegin(), end = map.cend(); it != end; ++it) { - cout << "The key: " << it.key() << Qt::endl - cout << "The value: " << it.value() << Qt::endl; - cout << "Also the value: " << (*it) << Qt::endl; + cout << "The key: " << it.key() << endl; + cout << "The value: " << qPrintable(it.value()) << endl; + cout << "Also the value: " << qPrintable(*it) << endl; } //! [keyiterator1] @@ -340,3 +189,16 @@ qDeleteAll(map2.keys()); int numPrimes = std::count_if(map.keyBegin(), map.keyEnd(), isPrimeNumber); qDeleteAll(map2.keyBegin(), map2.keyEnd()); //! [keyiterator2] + +//! [28] +QMap<QString, int> map; +map.insert("January", 1); +map.insert("February", 2); +// ... +map.insert("December", 12); + +for (auto [key, value] : map.asKeyValueRange()) { + cout << qPrintable(key) << ": " << value << endl; + --value; // convert to JS month indexing +} +//! [28] |