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Looping trhu structs/class elements

Started by Craazer Jan 29, 2003 at 5:09 PM 5 replies 200+ views

Original Post

Jan 29, 2003 at 5:09 PM

Is there any better way to do this? RECT rect; //= {0,0,0,0}; // cant relay to init {} rect.top = 0; rect.bottom = 0; rect.left = 0; rect.right = 0; So is there better way looping thoes four? Is enum solution?

Armand

Jan 29, 2003 at 5:20 PM

Short answer, Not really.
The names inside a struct or a class are there for the programer.
By the time It gets executed its an address and a space allocation inside the binary.

If it''s really getting you down you might try.

memset(▭, 0, sizeof(rect));

This will be a fraction slower then zeroing the members your self. {Functional overhead} but does mean the your code is a bit shorter.

Regards,
Armand

Craazer

Jan 29, 2003 at 5:26 PM

quote:
Original post by Armand
Short answer, Not really.
The names inside a struct or a class are there for the programer.
By the time It gets executed its an address and a space allocation inside the binary.

If it''s really getting you down you might try.

memset(▭, 0, sizeof(rect));

This will be a fraction slower then zeroing the members your self. {Functional overhead} but does mean the your code is a bit shorter.

Regards,
Armand

Hmm that would be the solution, but actualy I need to get values.

Qw3r7yU10p!

Jan 29, 2003 at 5:29 PM

in c++ you use a constructor to initialise data

civguy

Jan 29, 2003 at 5:37 PM

Perhaps you want something like this?

  
struct RECT {
  union {
    struct {
      int top;
      int bottom;
      int left;
      int right;
    };
    int data[4];
  };
};

#include <iostream>

int main() {
  RECT rect;

  for (int i=0; i<4; ++i)
    rect.data[i] = 0;

  rect.top = 2;
  rect.right = 6;

  for (int i=0; i<4; ++i)
    std::cout << rect.data[i] << ''\n'';
}

LilBudyWizer

Jan 29, 2003 at 7:17 PM

Why not ...

  
class MyRect : public RECT
{
    public:
        inline MyRect(void)
        {
            left = right = top = bottom = 0;
        };

        inline MyRect(const MyRect &src)
        {
            left = src.left;
            right = src.right;
            top = src.top;
            bottom = src.bottom;
        };

        inline MyRect(long left, long top, long right, long bottom)
        {
            this->left = left;
            this->right = right;
            this->top = top;
            this->bottom = bottom;
        };

        inline MyRect &operator =(const MyRect &src)
        {
            left = src.left;
            right = src.right;
            top = src.top;
            bottom = src.bottom;

            return(this);
        };
};

int main(void)
{
   MyRect arect(1,2,3,4), brect(arect), crect;
   crect = MyRect(4,3,2,1);
   arect = brect = crect;

   return(0);
}

or something there abouts.

Craazer

Jan 30, 2003 at 7:07 AM

Ooh yes, thanks CivGuy this is just what I wanted!

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