Problems with pointers to arrays of objects.

Chris Vogel · 2002-10-03T17:56:43

Okay, I have a CTile class holding some info about a map position. I''m declaring the Map as CTile Map[10][10]. Now, I want to pass a pointer to this structure to a function that will draw the map. I can''t get this to work! See my code below, I know I''m doing it wrong, (CMap ** != CMap[10][10]) but, I don''t know how to do it right. Any help would be appreciated. define USE_CONSOLE #include <allegro.h> class CTile { public: BITMAP *tile_base; BITMAP *tile_terrain; bool passable; }; PALETTE palette; BITMAP *buffer; BITMAP *tile_base_water; BITMAP *tile_base_grass; BITMAP *tile_terrain_tree; void draw_map(CTile** pMap); int main() { allegro_init(); install_keyboard(); set_color_depth(16); set_gfx_mode(GFX_AUTODETECT, 640, 480, 0, 0); //setup Bitmaps buffer = create_bitmap(SCREEN_W, SCREEN_H); tile_base_water = load_bitmap("water.bmp", palette); tile_base_grass = load_bitmap("grass.bmp", palette); tile_terrain_tree = load_bitmap("tree.bmp", palette); //Create Map CTile Map[10][10]; for (int x = 0; x < 10; x++) { for (int y = 0; y < 10; y++) { Map[x][y].passable = true; Map[x][y].tile_base = tile_base_grass; Map[x][y].tile_terrain = NULL; } } Map[2][5].tile_terrain = tile_terrain_tree; //End Map Creation while (! key[KEY_ESC] ) { draw_map(Map); } //Destroy Bitmaps & exit destroy_bitmap(buffer); destroy_bitmap(tile_base_water); destroy_bitmap(tile_base_grass); destroy_bitmap(tile_terrain_tree); return 0; } void draw_map(CTile** pMap) { // ... } Oh, and the error I''m getting if you need it, is error C2664: ''draw_map'' : cannot convert parameter 1 from ''class CTile [10][10]'' to ''class CTile ** '' Types pointed to are unrelated; conversion requires reinterpret_cast, C-style cast or function-style cast Error executing cl.exe. Thanks! ~~~~~~~~~~~ Chris Vogel ~~~~~~~~~~~

For Beginners

Started by Radagar October 02, 2002 10:41 AM

13 comments, last by Radagar 21 years, 6 months ago

Anonymous

October 03, 2002 12:14 PM

oh yeah.. heheh. Thanks.

nicho_tedja

122

October 03, 2002 03:06 PM

Try this:

void draw_map(CTile pMap[][]);

...or is it

void draw_map(CTile[][] pMap); ?

I forgot, I never use static array anymore.

My compiler generates one error message: "does not compile."

My compiler generates one error message: "does not compile."

nicho_tedja

122

October 03, 2002 03:09 PM

You know what, make yourself comfortable using multiple pointers and dynamic allocation memory, that''s gonna save your life.

My compiler generates one error message: "does not compile."

Radagar

148

Author

October 03, 2002 03:16 PM

Thanks for the replies everyone, although I''m still pretty confused =)

It''s working great right now with the CTile array stored in a CMap class, and passing a pointer to that CMap the the draw_screen function.

All is good now.

~~~~~~~~~~~
Chris Vogel
~~~~~~~~~~~

WyrmSlayer RPG - In Early Development

dalleboy

324

October 03, 2002 05:56 PM

quote:Original post by Radagar
I really prefer to keep the multi-dimensional array.

Why not go for a more C++ solution and create your own class for your two-dimensional arrays?

Problems with pointers to arrays of objects.

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