#ifndef STA_RTOS_HANDLE_HPP
#define STA_RTOS_HANDLE_HPP

#include <type_traits>

/**
 * @defgroup STA_RTOS_HANDLE Handle
 * @ingroup STA_RTOS_API
 * @brief Helper for managing access to RTOS handles.
 */

namespace sta
{
	/**
	 * @brief Helper for managing access to RTOS handles.
	 *
	 * @tparam T    CMSIS RTOS2 handle type
	 *
	 * @ingroup STA_RTOS_HANDLE
	 */
	template <typename T>
	class RtosHandle
	{
	public:
		using handle_type = T;  /**< Handle type */

		// TODO Support integer type with sizeof(T) == sizeof(void *)
		static_assert(std::is_same<handle_type, void *>::value, "Only compatible with void * handle types");

		/**
		 * @brief Helper type for deferred handle evaluation.
		 */
		struct Deferred
		{
			/// @brief Handle variable address type
			handle_type * pointer;

			/**
			 * @brief Construct from handle address.
			 *
			 * @param handlePointer Handle variable address
			 */
			Deferred(handle_type * handlePointer);
		};

	public:
		/**
		 * @brief Construct handle from value.
		 *
		 * @param handle    Handle value
		 */
		RtosHandle(handle_type handle);
		/**
		 * @brief Construct handle with deferred evaluation.
		 *
		 * @param handle    Handle variable address
		 */
		RtosHandle(Deferred handle);

		/**
		 * @brief Access handle value.
		 *
		 * If the deferred ctor was used the handle value is
		 * evaluated on the first call to this method.
		 *
		 * @return Handle value
		 */
		handle_type get();

	private:
		handle_type handle_;    /**< Handle value or variable address */
		bool deferred_;         /**< Is handle evaluation deferred */
	};
} // namespace sta


#include <sta/rtos/handle.tpp>


#endif // STA_RTOS_HANDLE_HPP