Two way Comunication between classes
Author
Hello all, I have a probelem, I have two classes Game Engine and Game Layer. Game engine handles all the input and output with the user. While Game layer handles all the game specific code. My problem is I want them to comunicate with each other. But I get a compiler error when ever I try to compile them since they each have a pointer to the other.
Is there away to get this working?
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Writer, Programer, Cook, I''m a Jack of all Trades
Current Design project
Chaos Factor Design Document
The solution is to use forward declarations. Also as a sidenote, I personally wouldn''t allow the engine to access any members of the game class. Otherwise, your engine class is likely going to be not very reusable.
Author
I''m affraid I don''t know what forward declarations are. Also neither class can directly memebers of each other, They just have access to varius public methods.
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Writer, Programer, Cook, I''m a Jack of all Trades
Current Design project
Chaos Factor Design Document
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Writer, Programer, Cook, I''m a Jack of all Trades
Current Design project
Chaos Factor Design Document
Hopefully you have the classes seperated into decleration (in a header) and function code (in a source file). If so, it's really simple. An example:
classa.hpp
classb.hpp
classa.cpp
classb.cpp
main.cpp
edit: decided to be nice and make a fully working example
[edited by - MaulingMonkey on August 10, 2003 4:57:44 AM]
classa.hpp
#ifndef CLASS_A#define CLASS_Aclass B; //forward decleration of class Bclass A{public: //for lazy example B *otherclass;public: void whatever( void ); void confirm_whatever( void );};#endif //ndef CLASS_A classb.hpp
#ifndef CLASS_B#define CLASS_Bclass A; //forward decleration of class Aclass B{public: //for lazy example A *otherclass;public: void do_whatever( void );};#endif //ndef CLASS_B classa.cpp
#include "classa.hpp"#include "classb.hpp"#include <iostream>A::whatever( void ){ otherclass->do_whatever();}A::confirm_whatever( void ){ std::cout << "Whatever confirmed!!!" << std::endl;} classb.cpp
#include "classa.hpp"#include "classb.hpp"B::do_whatever( void ){ otherclass->confirm_whatever();} main.cpp
#include "classa.hpp"#include "classb.hpp"int main ( int argc , char ** argv ){ A a; B b; A.otherclass = &b B.otherclass = &a A.whatever(); //preformed actions: //A.whatever() calls: B->do_whatever() //B->do_whatever() calls: A->confirm_whatever() //A->confirm_whatever() prints confirmation return 0;} edit: decided to be nice and make a fully working example
[edited by - MaulingMonkey on August 10, 2003 4:57:44 AM]
why don''t u just have ur game layer update variables in teh game engine layer or like he said its not going to be very reusable. Also it would help if u posted some code but its ilke this
//gameengine.hclass gamelayer;class gameengine{ public: gamelayer *Dgamelayer; gameengine(); setup(gamelayer *Pgamelayer){Dgamelayer=Pgamelayer;}};//gamelayer.hclass gameengine;class gamelayer { public: gameengine*Dgameengine; gamelayer(gameengine*Pgameenginer){Dgameengine=Pgameengine;}};int main{ gameengine *ge = new gameengine(); gamelayer *gl = new gamelayer(ge); gameengine->setup(gl); //.......go on}
Author
Thanks, for the help the forward declaration seems to be working fine.
Also, The GameEngine as it is so far has no game specific code.
At present these are the only methods in GameLayer that Game Engine can call, and all it needs to call.
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Writer, Programer, Cook, I''m a Jack of all Trades
Current Design project
Chaos Factor Design Document
Also, The GameEngine as it is so far has no game specific code.
MapFile * getMapTile(int mX,int mY) {return &map[mX][mY];}void interactionEffect(int interIndex, int x,int y);At present these are the only methods in GameLayer that Game Engine can call, and all it needs to call.
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Writer, Programer, Cook, I''m a Jack of all Trades
Current Design project
Chaos Factor Design Document
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