0
对于不知道如何描述我的问题,我表示歉意。我希望这个例子很清楚。如果您不知道传递方法的确切类别,如何将方法传递给类
//My Arduino based device has a real time clock for which I use a library
#include <RTClib.h>
RTC_DS3234 RTClock(PIN_CLOCK_CS); // uses SPI
DateTime dt = RTClock.now();
// I also have written a logging class which is a singleton
#include <Logger_SD.h>
Logger_SD::Instance()->initializeSD(PIN_SD_CS,PIN_CLOCK_CS,&dt);
所以我的记录器类现在在生成日志消息时使用指向dt的指针。不幸的是,每次我打电话给记录器时,我都必须更新dt,以便它有正确的日期和时间。
dt = RTClock.now();
Logger_SD::Instance()->msgL(INFO,F("Setting Up MPU6050 Gyro."));
我想通过RTClock.now()方法,它总是返回一个DateTime到Logger_SD所以它可以得到它自己该死的时间。不幸的是,有许多种RTC。我可以这样做:
RTC_DS1307 RTClock(0x68); // Uses i2c
// or
RTC_DS3231 RTClock(0x68); // Also I2c, but does more.
// Lots more.
// then again...
DateTime dt;
dt = RTClock.now();
// I'd like to do something like:
DateTime myNow() return RTClock.now();
Logger_SD::Instance()->initializeSD(PIN_SD_CS,PIN_CLOCK_CS,&myNow);
这些都返回datetime一个NOW()方法,但我怎么通过NOW()方法,而不必对每类RTC对象的特殊情况Logger_SD ?
我Logger_SD.h看起来有点像这样,如果有帮助:
class Logger_SD {
public: // I don't quite understand the mechanics here, but it works great.
static Logger_SD* Instance();
bool initializeSD(const uint8_t, const uint8_t disable_chip_select,DateTime* dt);
void msgL(LOG_LEVEL logLevel,const __FlashStringHelper *format, ...);
// ...
private:
Logger_SD(){};
Logger_SD(Logger_SD const&){};
Logger_SD& operator=(Logger_SD const&){};
static Logger_SD* m_pInstance;
DateTime *_dt;
// ...
};
我希望这是明确的。
下面是一个简单的例子:
class RTC1 {
public:
char now() { return 'A';}
};
class RTC2 {
public:
char now() { return 'B';}
};
class Logger {
public:
void ini(char f()) { logTime = &f ;} // this doesn't work
char (*logTime)();
};
void setup(){
Serial.begin(57600);
RTC1 myRTC1;
Logger myLogger;
myLogger.ini(&myRTC1.now);
Serial.println(MyLogger.logTime()); // Should print 'A'
// now on a diffent kind of RTC for the same Logger
RTC2 myRTC2;
myLogger.ini(&myRTC2.now);
Serial.println(MyLogger.logTime()); // Should print 'B'
}