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forward declaration for cyclic includes..

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hey, I have a cyclic include thing going on, it should be fine because i am forward declaring.. whats goin on here
// perception.h
#pragma once

#include "agent.h"
// forward Declaration
class Agent;

class Perception
	Agent* pClosestKin;
	Agent* pClosestMate;
	Agent* pClosestFood;
	Agent* pCloasestThreat;


#pragma once
//other includes clipped//
#include "perception.h"

#define MUTATION 15

// forward declaration
class Perception;

class Agent : public WereIRenderable, public WereIFileable
	static std::map<std::string, Agent*> m_AgentMap;
	static long* pAgentID;
	std::string m_location;

	WereModel * m_pModel;
	Behavior* m_pBehavior;
	Stats* m_pStats;
	AgentState m_state;
	Perception m_perception;
// rest of class clipped//

have i forward declared wrong? both of the classes compile if i dont try to mix them here is the error Agent.h(36): error C2079: 'Agent::m_perception' uses undefined class 'Perception' thanks

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Guest Anonymous Poster

#ifndef SOME_NAME
#define SOME_NAME

// your code


might be worth a try

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Your forward declaraions are fine, but perception.h doesn't need to include agent.h because it only uses Agent as a pointer. Move that #include to perception.cpp, and the circular dependancy will go away.

Also, don't rely on #pragma once to prevent a header from being included more than once, because it's a compiler-specific extension. It's best to stick with the old fashioned method of include guards:


/* the header */


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