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/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
* Copyright (C) 2020, Google Inc.
*
* extensible.h - Utilities to create extensible public classes with stable ABIs
*/
#ifndef __LIBCAMERA_EXTENSIBLE_H__
#define __LIBCAMERA_EXTENSIBLE_H__
#include <memory>
namespace libcamera {
#ifndef __DOXYGEN__
#define LIBCAMERA_DECLARE_PRIVATE(klass) \
public: \
class Private; \
friend class Private;
#define LIBCAMERA_DECLARE_PUBLIC(klass) \
friend class klass; \
using Public = klass;
#define LIBCAMERA_D_PTR() \
_d<Private>();
#define LIBCAMERA_O_PTR() \
_o<Public>();
#else
#define LIBCAMERA_DECLARE_PRIVATE(klass)
#define LIBCAMERA_DECLARE_PUBLIC(klass)
#define LIBCAMERA_D_PTR(klass)
#define LIBCAMERA_O_PTR(klass)
#endif
class Extensible
{
public:
class Private
{
public:
Private(Extensible *o);
virtual ~Private();
#ifndef __DOXYGEN__
template<typename T>
const T *_o() const
{
return static_cast<const T *>(o_);
}
template<typename T>
T *_o()
{
return static_cast<T *>(o_);
}
#endif
private:
Extensible *const o_;
};
Extensible(Private *d);
protected:
#ifndef __DOXYGEN__
template<typename T>
const T *_d() const
{
return static_cast<const T *>(d_.get());
}
template<typename T>
T *_d()
{
return static_cast<T *>(d_.get());
}
#endif
private:
const std::unique_ptr<Private> d_;
};
} /* namespace libcamera */
#endif /* __LIBCAMERA_EXTENSIBLE_H__ */
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