Re: Multidimensional array member initialization

<olivier.scalbert@algosyn.com> ha scritto nel messaggio
news:c5deac91-7a8b-48f0-bf6c-80faaa34c096@j24g2000yqa.googlegroups.com...


i don't know
here is my solution (don't know if it is right)
------------------------
#include <iostream>
#include <stdlib.h>

using namespace std;

struct Color3d{
    float r, g, b;
};

class Image{
public:
  Image(int width, int height);
  ~Image();
  void fill(Color3d& color);

  int width;
  int height;
  Color3d** pxs;
};

Image::Image(int w, int h)
{int i, g, gg;

 width=0; height=0; pxs=0;
 if(w<=0||h<=0) return;
 g =h*sizeof(Color3d*);
 if(g<=0) return;
 gg=w*sizeof(Color3d); // pixel are h*w
 if(gg<=0) return;
 pxs=(Color3d**) malloc(g);
 if(pxs==0) return;
 for(i=0; i<h; ++i)
   {pxs[i]=(Color3d*) malloc(gg);
    if(pxs[i]==0)
      {for(--i; i>=0; --i)
             free(pxs[i]);
       free(pxs); pxs=0;
       return;
      }
    }
 width=w; height=h;
}

Image::~Image()
{int i;
 if(pxs==0) return;
 for(i=0; i<height; ++i)
    free(pxs[i]);
 free(pxs);
}

void Image::fill(Color3d& color)
{int x, y;
 if(pxs==0) return;
 for(x=0; x<height; ++x)
    {for(y=0; y<width; ++y)
             pxs[x][y]=color;
    }
}

int main(void)
{Color3d h={0.78373, 0.1383, 1-0.78373-0.1383};
 Image g(1024, 768);

 if(g.pxs==0)
    {cout << "Error\n"; return 0;}
 g.fill(h);
 cout << "(r,g,b)==(" << g.pxs[0][0].r << ", "
                      << g.pxs[0][0].g << ", "
                      << g.pxs[0][0].b << ")\n";
 return 0;
}