c++ - Cannot access class member of a 2d array of object pointers (type***) -

i making conway's game of life. have 2 classes, 1 plane of cells, , cells. cells 2d linked list 4 pointers per cell pointing vertical , horizontal neighbors. when trying access of cell pointers other cells, or alive member program crashes.

my code

//game.h #ifndef game_h_ #define game_h_ #include <iostream> class cell{     public:         bool alive;         cell* top;         cell* bot;         cell* lef;         cell* rig;         cell(){             alive = false;             top = bot = lef = rig = nullptr;         }         cell* link(char);         int alive_neighbors();         void link_right(cell*);         void link_down(cell*);         void refresh_cell();  };  class field{     public:         int size;         cell * origin;         bool ** new_state;         cell *** fi;         field(int a);         ~field();  };  #endif 

and

//game.cpp #include <iostream> #include "game.h"  int cell::alive_neighbors(){     int num = 0;     (this->top)?((this->top->alive)?(++num):(num)||((this->top->rig)?((this->top->rig->alive)?(num++):(num)):(num))):(num);     (this->bot)?((this->bot->alive)?(++num):(num)||((this->bot->lef)?((this->bot->lef->alive)?(num++):(num)):(num))):(num);     (this->rig)?((this->rig->alive)?(++num):(num)||((this->rig->bot)?((this->rig->bot->alive)?(num++):(num)):(num))):(num);     (this->lef)?((this->lef->alive)?(++num):(num)||((this->lef->bot)?((this->lef->bot->alive)?(num++):(num)):(num))):(num);     return num; }  void cell::link_right(cell* linkee){     this->rig = linkee;     linkee->lef = this; }  void cell::link_down(cell* linkee){     this->bot = linkee;     linkee->top = this; }  field::field(int a){     size = a;     (int i= 0; < size; i++){         fi[i] = new cell*[size];         (int j = 0; j < size; j++){             fi[i][j] = new cell;                         }     }     (int = 0; < size; i++){         (int j = 0; j < size -1; j++){             this->fi[i][j]->link_right(this->fi[i][j+1]);             this->fi[j][i]->link_down(this->fi[j+1][i]);         }     }     origin = fi[0][0] }  field::~field(){     (int = size -1; >= 0; i--){         (int j = size -1;j >= 0; j--){             delete fi[i][j];         }         delete fi[i];     } } 

error:

#include "game.h" int main(){     field game(10);     std::cout << game.origin->alive << std::endl; //compiles crashes :(     std::cout << game.origin->rig << std::endl; //also compiles , crashes without giving adress.     std::cout << game.fi[0][0]->alive; //even directly accessing cell compiles , crashes. } 

the problem game.cpp try code

//game.cpp #include <iostream> #include "stackoverflow.hpp"  int cell::alive_neighbors(){     int num = 0;     (this->top)?((this->top->alive)?(++num):(num)||((this->top->rig)?((this->top->rig->alive)?(num++):(num)):(num))):(num);     (this->bot)?((this->bot->alive)?(++num):(num)||((this->bot->lef)?((this->bot->lef->alive)?(num++):(num)):(num))):(num);     (this->rig)?((this->rig->alive)?(++num):(num)||((this->rig->bot)?((this->rig->bot->alive)?(num++):(num)):(num))):(num);     (this->lef)?((this->lef->alive)?(++num):(num)||((this->lef->bot)?((this->lef->bot->alive)?(num++):(num)):(num))):(num);     return num; }  void cell::link_right(cell* linkee){     this->rig = linkee;     linkee->lef = this; }  void cell::link_down(cell* linkee){     this->bot = linkee;     linkee->top = this; }  field::field(int a){     size = a;     fi = new cell**[size];     (int i= 0; < size; i++){         fi[i] = new cell*[size];         (int j = 0; j < size; j++){             fi[i][j] = new cell;                         }     }     (int = 0; < size; i++){         (int j = 0; j < size -1; j++){             this->fi[i][j]->link_right(this->fi[i][j+1]);             this->fi[j][i]->link_down(this->fi[j+1][i]);         }     }     origin = fi[0][0]; }  field::~field(){     (int = size -1; >= 0; i--){         (int j = size -1;j >= 0; j--){             delete fi[i][j];         }         delete fi[i];     } } 

i not understand why people here tend annoyed because ones asking questions not coding "correct" style. need make mistakes , learn them. on note in future when work on c++ project. try using stl containers, refreshingly simple , efficient. you'll love them.

also think of n-dimensional arrays way. use 1 * every dimension. int* arr 1-d array , int** arr 2-d array. can switch cell** here since want 2-d array :)