doc_src_qset.cpp

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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
 
#include <QtCore>
#include <iostream>
 
using namespace std;
void snippets_0_3()
{
        //! [0]
        QSet<QString> set;
        //! [0]
 
 
        //! [1]
        set.insert("one");
        set.insert("three");
        set.insert("seven");
        //! [1]
 
 
        //! [2]
        set << "twelve" << "fifteen" << "nineteen";
        //! [2]
 
 
        //! [3]
        if (!set.contains("ninety-nine"))
            {/*...*/}
        //! [3]
}
 
#if __has_include(<QWidget>)
 
#include <QWidget>
 
void example_widgets()
{
    QSet<QWidget *> set;
    //! [4]
    QSetIterator<QWidget *> i(set);
    while (i.hasNext()) {
        QWidget *w = i.next();
        qDebug() << w;
    }
    //! [4]
}
#endif
 
void snippets_5_12()
{
    QSet<QString> set;
 
    //! [5]
    for (auto i = set.cbegin(), end = set.cend(); i != end; ++i)
        qDebug() << *i;
    //! [5]
 
    {
        //! [6]
        QSet<QString> set;
        //...
        for (const auto &value : set)
            qDebug() << value;
        //! [6]
    }
 
    {
        QString values[3];
        //! [7]
        QSet<QString> set;
        set.reserve(20000);
        for (int i = 0; i < 20000; ++i)
            set.insert(values[i]);
        //! [7]
    }
 
    {
        //! [8]
        QSet<QString> set = {"January", "February", /*...*/ "December"};
 
        // i is a QSet<QString>::iterator
        for (auto i = set.begin(), end = set.end(); i != end; ++i)
            qDebug() << *i;
        //! [8]
    }
 
    {
        //! [9]
        QSet<QString> set = {"January", "February", /*...*/ "December"};
 
        auto i = set.begin();
        while (i != set.end()) {
            if ((*i).startsWith('J')) {
                i = set.erase(i);
            } else {
                ++i;
            }
        }
        //! [9]
    }
 
    {
        //! [10]
        QSet<QString> set;
        //...
        const auto predicate = [](const QString &s) { return s.compare("Jeanette", Qt::CaseInsensitive) == 0; };
        QSet<QString>::iterator it = std::find_if(set.begin(), set.end(), predicate);
        if (it != set.end())
            cout << "Found Jeanette" << endl;
        //! [10]
    }
 
    {
        //! [11]
        QSet<QString> set = {"January", "February", /*...*/ "December"};
 
        // i is QSet<QString>::const_iterator
        for (auto i = set.cbegin(), end = set.cend(); i != end; ++i)
            qDebug() << *i;
        //! [11]
    }
 
    {
        //! [12]
        QSet<QString> set;
        //...
        const auto predicate = [](const QString &s) { return s.compare("Jeanette", Qt::CaseInsensitive) == 0; };
        QSet<QString>::const_iterator it = std::find_if(set.cbegin(), set.cend(), predicate);
        if (it != set.constEnd())
            cout << "Found Jeanette" << endl;
        //! [12]
    }
}