C语言中动态绑定常用函数指针, 比如:
/**
rief Access structure of the USART Driver.
*/
typedef struct _ARM_DRIVER_USART {
ARM_DRIVER_VERSION (*GetVersion) (void); ///< Pointer to
ef ARM_USART_GetVersion : Get driver version.
ARM_USART_CAPABILITIES (*GetCapabilities) (void); ///< Pointer to
ef ARM_USART_GetCapabilities : Get driver capabilities.
int32_t (*Initialize) (ARM_USART_SignalEvent_t cb_event); ///< Pointer to
ef ARM_USART_Initialize : Initialize USART Interface.
int32_t (*Uninitialize) (void); ///< Pointer to
ef ARM_USART_Uninitialize : De-initialize USART Interface.
int32_t (*PowerControl) (ARM_POWER_STATE state); ///< Pointer to
ef ARM_USART_PowerControl : Control USART Interface Power.
int32_t (*Send) (const void *data, uint32_t num); ///< Pointer to
ef ARM_USART_Send : Start sending data to USART transmitter.
int32_t (*Receive) ( void *data, uint32_t num); ///< Pointer to
ef ARM_USART_Receive : Start receiving data from USART receiver.
int32_t (*Transfer) (const void *data_out,
void *data_in,
uint32_t num); ///< Pointer to
ef ARM_USART_Transfer : Start sending/receiving data to/from USART.
uint32_t (*GetTxCount) (void); ///< Pointer to
ef ARM_USART_GetTxCount : Get transmitted data count.
uint32_t (*GetRxCount) (void); ///< Pointer to
ef ARM_USART_GetRxCount : Get received data count.
int32_t (*Control) (uint32_t control, uint32_t arg); ///< Pointer to
ef ARM_USART_Control : Control USART Interface.
ARM_USART_STATUS (*GetStatus) (void); ///< Pointer to
ef ARM_USART_GetStatus : Get USART status.
int32_t (*SetModemControl) (ARM_USART_MODEM_CONTROL control); ///< Pointer to
ef ARM_USART_SetModemControl : Set USART Modem Control line state.
ARM_USART_MODEM_STATUS (*GetModemStatus) (void); ///< Pointer to
ef ARM_USART_GetModemStatus : Get USART Modem Status lines state.
} const ARM_DRIVER_USART;C++中有更加智能, 更加灵活的方法, std::function就是一种.
简单讲, std::function类似于std::string 、std::vector<> 、这样的类型。只不过其值为函数指针，但比函数指针更灵活。
因为std::function 是一种模板，所以要传入类型，就如std::vector<int> 传入类型int一样
不过,std::function传入的是函数类型 返回值 （参数类型） 如：std::function<void (int)>.
下面通过几个简单例子演示一下其基本用法.
