threads.cpp

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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
 
#include <QCache>
#include <QMutex>
#include <QThreadStorage>
 
#define Counter ReentrantCounter
 
class Counter
{
public:
    Counter() { n = 0; }
 
    void increment() { ++n; }
    void decrement() { --n; }
    int value() const { return n; }
 
private:
    int n;
};
 
#undef Counter
#define Counter ThreadSafeCounter
 
class Counter
{
public:
    Counter() { n = 0; }
 
    void increment() { QMutexLocker locker(&mutex); ++n; }
    void decrement() { QMutexLocker locker(&mutex); --n; }
    int value() const { QMutexLocker locker(&mutex); return n; }
 
private:
    mutable QMutex mutex;
    int n;
};
 
typedef int SomeClass;
 
//! [7]
QThreadStorage<QCache<QString, SomeClass> > caches;
 
void cacheObject(const QString &key, SomeClass *object)
//! [7] //! [8]
{
    caches.localData().insert(key, object);
}
 
void removeFromCache(const QString &key)
//! [8] //! [9]
{
    if (!caches.hasLocalData())
        return;
 
    caches.localData().remove(key);
}
//! [9]
 
int main()
{
    return 0;
}