ardupilot/libraries/AP_HAL_Linux/AP_HAL_Linux.h

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#pragma once
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/* Your layer exports should depend on AP_HAL.h ONLY. */
#include <AP_HAL/AP_HAL.h>
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/**
* Umbrella header for AP_HAL_Linux module.
* The module header exports singleton instances which must conform the
* AP_HAL::HAL interface. It may only expose implementation details (class
* names, headers) via the Linux namespace.
* The class implementing AP_HAL::HAL should be called HAL_Linux and exist
* in the global namespace. There should be a single const instance of the
* HAL_Linux class called AP_HAL_Linux, instantiated in the HAL_Linux_Class.cpp
* and exported as `extern const HAL_Linux AP_HAL_Linux;` in HAL_Linux_Class.h
*
* All declaration and compilation should be guarded by CONFIG_HAL_BOARD macros.
* In this case, we're using CONFIG_HAL_BOARD == HAL_BOARD_LINUX.
* When creating a new HAL, declare a new HAL_BOARD_ in AP_HAL/AP_HAL_Boards.h
*/
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#if CONFIG_HAL_BOARD == HAL_BOARD_LINUX
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#include "HAL_Linux_Class.h"
#endif // CONFIG_HAL_BOARD