c++ - arrays, constructors and instances -


i explain problem: i'm trying solve arrays proble, got programme done in oop in has class called lights. want array pin numbers inside , set them output. did pin pin , easy loop , array don't know how build constructors , handle of array whit pin numbers in it.

    //---------------------------------------------------------------------------------- class lights{    int pins[5]; //array 5 elements   int i;     public:   lights(int ledpins[]){      for(i=0; i<5; i++){     //pins set output       pinmode(pins[i],output);     }    }//end constructor     void attempt(){                        //metodo para pobrar si se enciende los leds      for(i=0; i<5; i++){       digitalwrite(pins[i],high);       serial.println(pins[i]);     }   }//end attempt };//end class //---------------------------------------------------------------------------------------------------------------------   int mypins[] = {5,6,7,8,9};        //i declare inside  lights lit(mypins);                 //i create objet array parameters  void setup(){   serial.begin(9600); }  void loop(){    lit.attempt();  }

you don't need put class. think using class lights overkill.

in experience, functions used process light pins , take pin enum.

unless have huge amount of pins set up, loop may not worthwhile. unrolling loop may increase programs efficiency:

pinmode(5,output); pinmode(6,output); pinmode(7,output); pinmode(8,output); pinmode(9,output);

initialization occurs once, optimization not warranted.

if need use classes, suggest 1 class models single light.

every light has associated pin.

you can have container of lights (such array): 

class light {   public:       light(unsigned int pin)       : m_pin(pin),         m_is_on(false)     { ; }      void initialize(); // sets appropriate pin     void on(); // turns on light     void off(); // turns off light     void blink(unsigned int rate, unsigned int duration);    private:      unsigned int m_pin;      bool         m_is_on; };  light display[] = {light(5), light(6), light(7), light(8), light(9)}; const unsigned int light_quantity =     sizeof(display) / sizeof(display[0]);

an advantage model program can in terms of lights , not worry pins.


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