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對於不知道如何描述我的問題,我表示歉意。我希望這個例子很清楚。如果您不知道傳遞方法的確切類別,如何將方法傳遞給類
//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);
所以我的記錄器類現在在生成日誌消息時使用指向dt的指針。不幸的是,每次我打電話給記錄器時,我都必須更新dt,以便它有正確的日期和時間。
dt = RTClock.now();
Logger_SD::Instance()->msgL(INFO,F("Setting Up MPU6050 Gyro."));
我想通過RTClock.now()方法,它總是返回一個DateTime到Logger_SD所以它可以得到它自己該死的時間。不幸的是,有許多種RTC。我可以這樣做:
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);
這些都返回datetime一個NOW()方法,但我怎麼通過NOW()方法,而不必對每類RTC對象的特殊情況Logger_SD ?
我Logger_SD.h看起來有點像這樣,如果有幫助:
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;
// ...
};
我希望這是明確的。
下面是一個簡單的例子:
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'
}