src_corelib_global_qrandom.cpp

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// Copyright (C) 2018 Intel Corporation.
// Copyright (C) 2018 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
 
#include <QRandomGenerator>
#include <QList>
 
double snippets_1_2_3()
{
    //! [0]
        quint32 value = QRandomGenerator::global()->generate();
    //! [0]
 
    //! [1]
        QRandomGenerator prng1(1234), prng2(1234);
        Q_ASSERT(prng1.generate() == prng2.generate());
        Q_ASSERT(prng1.generate64() == prng2.generate64());
    //! [1]
 
    //! [2]
        int x = QRandomGenerator::global()->generate();
        int y = QRandomGenerator::global()->generate();
        int w = QRandomGenerator::global()->bounded(16384);
        int h = QRandomGenerator::global()->bounded(16384);
    //! [2]
 
    //! [3]
        std::uniform_real_distribution<> dist(1, 2.5);
        return dist(*QRandomGenerator::global());
    //! [3]
}
class Generator : public QRandomGenerator
{
    public:
        qreal snippets_4_to_11(int z, quint32 *begin, quint32 *end, const quint32 *seedBuffer, size_t len);
};
 
qreal Generator::snippets_4_to_11(int z, quint32 *begin, quint32 *end, const quint32 *seedBuffer, size_t len)
{
    {
        //! [4]
            std::seed_seq sseq(seedBuffer, seedBuffer + len);
            QRandomGenerator generator(sseq);
        //! [4]
    }
 
    //! [5]
        std::seed_seq sseq(begin, end);
        QRandomGenerator generator(sseq);
    //! [5]
 
    //! [6]
        while (z--)
            generator.generate();
    //! [6]
 
    //! [7]
        std::generate(begin, end, [this]() { return generate(); });
    //! [7]
 
    //! [8]
        std::generate(begin, end, []() { return QRandomGenerator::global()->generate64(); });
    //! [8]
 
    //! [9]
        QList<quint32> list;
        list.resize(16);
        QRandomGenerator::global()->fillRange(list.data(), list.size());
    //! [9]
 
    //! [10]
        quint32 array[2];
        QRandomGenerator::global()->fillRange(array);
    //! [10]
 
    //! [11]
        QRandomGenerator64 rd;
        return std::generate_canonical<qreal, std::numeric_limits<qreal>::digits>(rd);
    //! [11]
}
 
double generateDouble()
{
    return 0.0;
}
 
double generateDoubleWithHighest(double highest)
{
    //! [12]
        return generateDouble() * highest;
    //! [12]
}
 
#include <QColor>
 
QColor snippets_13_to_15()
{
    {
    //! [13]
        quint32 v = QRandomGenerator::global()->bounded(256);
    //! [13]
    }
 
    //! [14]
        quint32 v = QRandomGenerator::global()->bounded(1000, 2000);
    //! [14]
 
    //! [15]
        return QColor::fromRgb(QRandomGenerator::global()->generate());
    //! [15]
}
 
void snippet_16()
{
    //! [16]
        qint64 value = QRandomGenerator64::global()->generate() & std::numeric_limits<qint64>::max();
    //! [16]
}