C++ Initializing Non-Static Member Array

Question

I am working on editing some old C++ code that uses global arrays defined like so:

int posLShd[5] = {250, 330, 512, 600, 680};
int posLArm[5] = {760, 635, 51         


        

Answer 1

If your requirement really permits then you can make these 5 arrays as static data members of your class and initialize them while defining in .cpp file like below:

class Robot
{
  static int posLShd[5];
  //...
};
int Robot::posLShd[5] = {250, 330, 512, 600, 680}; // in .cpp file

If that is not possible then, declare this arrays as usual with different name and use memcpy() for data members inside your constructor.

Edit: For non static members, below template style can be used (for any type like int). For changing the size, simply overload number of elements likewise:

template
struct Array
{
  Array (T (&a)[SIZE])
  {
    a[0] = _0;
    a[1] = _1;
    a[2] = _2;
    a[3] = _3;
    a[4] = _4;
  }
};

struct Robot
{
  int posLShd[5];
  int posLArm[5];
  Robot()
  {
    Array<5,int,250,330,512,600,680> o1(posLShd);
    Array<5,int,760,635,512,320,265> o2(posLArm);
  }
};

C++11

The array initialization has now become trivial:

class Robot
{
   private:
       int posLShd[5];
       ...
   public:
       Robot() : posLShd{0, 1, 2, 3, 4}, ...
       {}
};