c++ - segmentation fault setting private data -


i have 7 x 7 matrix of probes deliver signal representing level measured @ point in area under investigation. each element of matrix cpp (g++) class , segmentation fault when try set private data element rect.x element of sdl_rect value.

class probe { public:     probe();     ~probe();     void setcolor(int x);     void set_id(int x, int y, int z);     void level_id(void);  private:     int oldcolor;     int xcord;     int ycord;     sdl_rect rect; }; //when access rec using public functions, rect.x returns 0  //and setting value give segment fault @ run time. //ie. rect.x = xcord; //segment fault foo = rect.x; // returns 0, starting value suppose. //my workround create rect locally in each public function  sdl_rect rect = {block_w * xcord, block_h * ycord, block_w, block_h}; //and think should be.  i'm not stuck.  ian //more details //#include etc probe level[7][7]; //49 instances of class void probe::set_id(int x, int y, int z)     {     xcord = x; //segment fault     ycord = y;     oldcolor = z; //  defininlg rectangles     sdl_rect rect = {block_w * xcord, block_h * ycord, block_w, block_h}; //  rect.x = block_w * xcord; //segment fault //  rect.y = block_h * ycord;     sdl_setrenderdrawcolor( ren, oldcolor, 0, 0, 255 );     sdl_renderfillrect( ren, &rect ); //  if (0 != sdl_fillrect(surface, &rect, sdl_maprgb(surface->format, oldcolor, 0, 0))); //      { std::cout << "sdl_fillrect failed in set_id" << std::endl; }     }    void sdl_init() { int x, y, z; z = 10;     for(y = 0; y <= 7; ++y)     {     for(x = 0; x <= 7; ++x)         {         z += 25;         level[x][y].set_id(x, y, z);         }     }       for(y = 0; y < 7; ++y)     {         for(x = 0; x < 7; ++x)         { level[x][y].level_id(); }     } }      void mouthpad() { std::cout << "in mouthpad" << std::endl;     //start sdl , create window     if( !init() )     { printf( "failed initialize!\n" ); }     else     {         sdl_init(); //get class going.          //main loop flag         bool quit = false;           //event handler             sdl_event e; //etc hope helps.  ian.


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