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// SPDX-FileCopyrightText: 2016 - 2022 UnionTech Software Technology Co., Ltd.
//
// SPDX-License-Identifier: LGPL-3.0-or-later
#ifndef DSINGLETON_H
#define DSINGLETON_H
#include "dtkcore_global.h"
DCORE_BEGIN_NAMESPACE
/*!
a simple singleton template for std c++ 11 or later.
example:
\code
class ExampleSingleton : public QObject, public Dtk::DSingleton<ExampleSingleton>
{
Q_OBJECT
friend class DSingleton<ExampleSingleton>;
};
\endcode
\note: for Qt, "public DSingleton<ExampleSingleton>" must be after QObject.
*/
/*!
通过c++11的特性实现的单例模板
使用示例:
```
class ExampleSingleton : public QObject, public Dtk::DSingleton<ExampleSingleton>
{
Q_OBJECT
friend class DSingleton<ExampleSingleton>;
};
```
\note 对于Qt程序 public DSingleton<ExampleSingleton>" 必须在卸载QObject后面出现。
*/
template <class T>
class LIBDTKCORESHARED_EXPORT DSingleton
{
public:
#if DTK_VERSION < DTK_VERSION_CHECK(6, 0, 0, 0)
QT_DEPRECATED_X("Use ref")
static inline T *instance()
{
static T *_instance = new T;
return _instance;
}
#endif
static T& ref()
{
static T instance;
return instance;
}
DSingleton(T&&) = delete;
DSingleton(const T&) = delete;
void operator= (const T&) = delete;
protected:
DSingleton() = default;
virtual ~DSingleton() = default;
};
DCORE_END_NAMESPACE
#endif // DSINGLETON_H
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