June 26th, 2009, 02:23 AM
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Join Date: Jun 2009
Posts: 6
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Class declaration problems
I've been stuck on this error for about a week now and I cant figure out whats going wrong. I have 2 classes that have functions that accept pointers to eachother, and have private variables that point to eachother. One is The map class for a game, and the other is a player class. If i try includeing the class each class is referenceing, i end up with the common problem of one of the classes having to be declared before the other. so to fix this i try to do a class declaration of map in the player file, and player in the map file. then it compiles fine, but when i try to link the object files together, all hell breaks loose.
heres some of the code
Player.h
Quote: #ifndef PLAYER_H
#define PLAYER_H
#include <string>
#include "SDL/SDL.h"
//forwared declaration
class Map_Wrap;
class Player
{
public:
Player();
~Player();
int getx();
int gety();
int getr();
void change_map (Map_Wrap *new_map);
int handle_input(SDL_Event event, Uint8 *keystates);
void move();
void paint_screen(SDL_Surface *screen);
bool check_collision( SDL_Rect A );
private:
SDL_Surface* add_surface(std::string filename);
SDL_Surface *dot;
SDL_Surface *direction_dot;
SDL_Rect box;
Map_Wrap *current_map;
double xmomentum;
double ymomentum;
//angular momentum
double amomentum;
//direction in radians
double direction;
int radius;
int small_rad;
int HP;
};
#endif |
map_wrap.h
Quote: #ifndef MAP_H
#define MAP_H
#include <vector>
#include <string>
#include "SDL/SDL.h"
const int SCREEN_WIDTH = 640;
const int SCREEN_HEIGHT = 480;
const int SCREEN_BBP=32;
const int TILE_SIZE = 50;
//forward declaration
class Player;
class Map_Wrap
{
public:
Map_Wrap(std::string filename);
~Map_Wrap();
std::vector<std::vector<int> > load_map (std::string filename);
SDL_Surface* draw_full_map ();
void apply_background (SDL_Surface *screen);
SDL_Rect center_camera(Player *player);
int get_height();
int get_width();
bool redraw_map();
private:
int map_width;
int map_height;
std::vector<std::vector<int> > raw_map_data;
SDL_Rect camera;
int x_index_tile;
int y_index_tile;
SDL_Surface *part_map;
};
#endif |
maintest3.cpp
Quote:
#include <iostream>
#include <fstream>
#include <string>
#include <sstream>
#include <vector>
#include "SDL/SDL.h"
#include "SDL/SDL_image.h"
#include "timer.h"
#include "map_wrap.h"
#include "player.h"
int main ()
{
const int FRAMES_PER_SECOND = 30;
SDL_Surface *screen=NULL;
//screen setup
{
//Initialize all SDL subsystems
if( SDL_Init( SDL_INIT_EVERYTHING ) == -1 )
{ exit(1); }
//Set up the screen
screen = SDL_SetVideoMode( SCREEN_WIDTH, SCREEN_HEIGHT, SCREEN_BBP, SDL_SWSURFACE );
//If there was an error in setting up the screen
if( screen == NULL )
{ exit(1); }
}
SDL_WM_SetCaption( "East and Evergreen", NULL );
//The frame rate regulator
Timer fps;
bool quit=false;
SDL_Rect *camera = new SDL_Rect;
SDL_Event event;
Uint8 *keystates = SDL_GetKeyState( NULL );
Map_Wrap *test_map= new Map_Wrap("map.map");
SDL_Surface *background = test_map->draw_full_map();
//int map_height=test_map.size();
//int map_width= test_map[0].size();
Player *p1 = new Player;
p1->change_map(test_map);
while (!quit)
{
fps.start();
while (SDL_PollEvent(&event))
{
if( event.type == SDL_QUIT )
{quit = true;}
}
p1->handle_input(event,keystates);
//p1.check_collision(wall);
p1->move();
//center camera
test_map->center_camera(p1);
//apply surfaces
p1->paint_screen(screen);
//apply_surface( background, screen, 0,0, camera );
//refresh
if( SDL_Flip( screen ) == -1 ) { return 1; }
if( fps.get_ticks() < 1000 / FRAMES_PER_SECOND )
{
//Sleep the remaining frame time
SDL_Delay( ( 1000 / FRAMES_PER_SECOND ) - fps.get_ticks() );
}
}
SDL_FreeSurface( background );
delete camera;
delete p1;
} |
output when trying to link
Quote: /home/biscuitdough/Desktop/east/eastv1/maintest3.cpp:80: undefined reference to `Timer::Timer()'
/home/biscuitdough/Desktop/east/eastv1/maintest3.cpp:87: undefined reference to `Map_Wrap::Map_Wrap(std::basic_string<char, std::char_traits<char>, std::allocator<char> >)'
/home/biscuitdough/Desktop/east/eastv1/maintest3.cpp:88: undefined reference to `Map_Wrap::draw_full_map()'
/home/biscuitdough/Desktop/east/eastv1/maintest3.cpp:91: undefined reference to `Player::Player()'
/home/biscuitdough/Desktop/east/eastv1/maintest3.cpp:92: undefined reference to `Player::change_map(Map_Wrap*)' |
and on and on for every function call from those classes.
please, any help would be nice, was making great progress before hitting this brick wall.
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