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Diffstat (limited to 'include/libcamera/extensible.h')
-rw-r--r-- | include/libcamera/extensible.h | 87 |
1 files changed, 87 insertions, 0 deletions
diff --git a/include/libcamera/extensible.h b/include/libcamera/extensible.h new file mode 100644 index 00000000..3f25a47c --- /dev/null +++ b/include/libcamera/extensible.h @@ -0,0 +1,87 @@ +/* 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__ */ |