src_corelib_text_qstring.cpp

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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
 
#include <QString>
 
using namespace Qt::StringLiterals;
 
 
struct Node
{
    QString name() const;
    bool hasAttribute(const QString &name);
};
 
void example()
{
    {
        //! [1]
        // Required for using the '_L1' string literal.
        using namespace Qt::StringLiterals;
        // ...
        QString url = "https://www.unicode.org/"_L1;
        //! [1]
    }
 
    {
        //! [2]
        double d = 12.34;
        QString str = QString("delta: %1").arg(d, 0, 'E', 3);
        // str == "delta: 1.234E+01"
        //! [2]
    }
 
    QString str;
 
    {
        //! [3]
        if (str == "auto" || str == "extern"
                || str == "static" || str == "register") {
            //...
        }
        //! [3]
    }
 
    {
        //! [4]
        if (str == QString("auto") || str == QString("extern")
                || str == QString("static") || str == QString("register")) {
            //...
        }
        //! [4]
    }
 
    {
        //! [4bis]
        str.append("Hello ").append("World");
        //! [4bis]
    }
 
    {
        //! [5]
        // Required for using the '_L1' string literal.
        using namespace Qt::StringLiterals;
        // ...
        if (str == "auto"_L1
                || str == "extern"_L1
                || str == "static"_L1
                || str == "register"_L1) {
            //...
        }
        //! [5]
    }
 
    {
        //! [7]
        QString plain = "#include <QtCore>";
        QString html = plain.toHtmlEscaped();
        // html == "#include &lt;QtCore&gt;"
        //! [7]
    }
 
    {
        //! [8]
        QString str("ab");
        str.repeated(4);            // returns "abababab"
        //! [8]
    }
 
    {
        Node node;
        Node attribute;
 
        //! [9]
        // hasAttribute takes a QString argument
        if (node.hasAttribute("http-contents-length")) {
            //...
        }
        //! [9]
 
        //! [10]
        if (node.hasAttribute(QStringLiteral(u"http-contents-length"))){
            //...
        }
        //! [10]
 
        //! [11]
        if (attribute.name() == "http-contents-length"_L1){
            //...
        }
        //! [11]
    }
 
    {
        QString key;
        QString value;
 
        //! [qUtf8Printable]
        qWarning("%s: %s", qUtf8Printable(key), qUtf8Printable(value));
        //! [qUtf8Printable]
 
        //! [qUtf16Printable]
        qWarning("%ls: %ls", qUtf16Printable(key), qUtf16Printable(value));
        //! [qUtf16Printable]
    }
}
 
#if __has_include(<QWidget>)
 
#include <QLabel>
#include <QWidget>
 
class LabelExample : public QWidget
{
    Q_OBJECT
    void exampleWithLabel()
    {
            //! [6]
            QLabel *label = new QLabel("MOD"_L1, this);
            //! [6]
    }
};
#endif