qt-everywhere-src-5.15.1/qtsensors/tests/auto/qsensor/test_backends.cpp

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** This file is part of the QtSensors module of the Qt Toolkit.
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#include <QList>

#include "qsensorbackend.h"

typedef QSensorBackend* (*CreateFunc) (QSensor *sensor);
class Record
{
public:
    QByteArray type;
    CreateFunc func;
};
static QList<Record> records;

static bool registerTestBackend(const char *className, CreateFunc func)
{
    Record record;
    record.type = className;
    record.func = func;
    records << record;
    return true;
}

#define REGISTER_TOO
#include "test_backends.h"
#include <QDebug>

class BackendFactory : public QSensorBackendFactory
{
    QSensorBackend *createBackend(QSensor *sensor) override
    {
        foreach (const Record &record, records) {
            if (sensor->identifier() == record.type) {
                return record.func(sensor);
            }
        }
        return 0;
    };
};
static BackendFactory factory;

void register_test_backends()
{
    foreach (const Record &record, records) {
        QSensorManager::registerBackend(record.type, record.type, &factory);
    }
}

void unregister_test_backends()
{
    foreach (const Record &record, records) {
        QSensorManager::unregisterBackend(record.type, record.type);
    }
}