CPP include header file results in thousands of errors - c++

Question

When I include this header File "pathfinding.h":
#pragma once
#include <BWAPI.h>
#include "BWAPI/TilePosition.h"
#include <vector>
#include "PathNode.h"
#include "Logger.h"
#include "ArgosMap.h"
#include "MapField.h"
#include "Utils.h"
#include "ComparePathNodePointer.h"
using namespace BWAPI;
class Pathfinding {
private:
std::vector<PathNode*> openList;
std::vector<PathNode*> closedList;
std::vector<Position*> buildpath(PathNode* targetNode);
void expandNode(PathNode* currentNode, MapField* targetField);
ArgosMap* argosMap;
public:
Pathfinding();
~Pathfinding();
std::vector<Position*> getShortestPath(MapField* startField, MapField* targetField);
};
In this header File "UnitAgent.h":
#pragma once
#include <BWAPI.h>
#include <vector>
#include "ArgosMap.h"
#include "Pathfinding.h"
using namespace BWAPI;
class UnitAgent {
protected:
Unit* unit;
UnitType unitType;
int unitID;
std::vector<Position*> trail;
Position target;
public:
UnitAgent(Unit* unit);
std::vector<Position*> getTrail();
Position getTarget();
Position* getPosition();
int getUnitID();
void setTarget(Position target);
void addPositionToTrail(Position* targetLocation);
void moveTo(TilePosition* targetPosition);
};
I get like a million errors mostly error C2143, C2065. But thats not true, the errors do not exist. When I include the header file in another file its all totally fine (except naturally for the stuff that needs the specific header file).
Any Ideas what I should check. Anyone an Idea how i can check my C++ Code, in a way Eclipse checks my java code. I mean why doesnt Visual Studio do that?

Answer 1

This kind of directive should not be in a header file
using namespace BWAPI;

Answer 2

To start with, why do you need all this
#include <BWAPI.h>
#include "BWAPI/TilePosition.h"
#include <vector>
#include "PathNode.h"
#include "Logger.h"
#include "ArgosMap.h"
#include "MapField.h"
#include "Utils.h"
#include "ComparePathNodePointer.h"
using namespace BWAPI;
in pathfinding.h? Just forward declaring ArgosMap, MapField, PathNode, and Position like
class ArgosMap;
class MapField;
class PathNode;
class Position;
is sufficient for pathfinding.h looking at the declaration of Pathfinding class, the stuff above should go to pathfinding.cpp if it is necessary for implementation of Pathfinding methods. The less stuff and dependencies you have in your headers, the easier it will be to debug.
Declarations in pathfinding.h look fine, problem is that some of the methods are not implemented/are not implemented properly. To find out what this methods are, you would need to narrow the scope of the problem - by removing unnecessary dependencies to start with.
Including pathfinding.h in files that do not use it's methods/methods from other headers included would always work fine...