one or more multiply defined symbols found

hi can anyone help me in this


code:

Code:

std::vector <struct defGeompoint> defPoints;

struct defGeompoint
{double defGeompt[3];
};


class defGeometry:public defFile{
public: struct Section Section1,
					  Section2,
					  Section3,
					  TempdefGeomSec;

	std::map<std::string, tag_t> objectNameTag;
	void populateGeometry(void);
	static tag_t createSplineThruPoints(struct Section);
	  Section formSection(Section Section1,Section Section2,int N1,int N2,int);
      Section  xtractPoints( Section Section1,int FromPoint,int ToPoint);

};

errors:


error LNK2005: "class std::vector<struct defGeompoint,class std::allocator<struct defGeompoint> > defPoints" (?defPoints@@3V?$vector@UdefGeompoint@@V?$allocato r@UdefGeompoint@@@std@@@std@@A) already defined in defFile.obj


error LNK2005: "class std::vector<struct defGeompoint,class std::allocator<struct defGeompoint> > defPoints" (?defPoints@@3V?$vector@UdefGeompoint@@V?$allocato r@UdefGeompoint@@@std@@@std@@A) already defined in defFile.obj



fatal error LNK1169: one or more multiply defined symbols found

> std::vector <struct defGeompoint> defPoints;
You've got this in a header file haven't you.

In the header file, use
extern std::vector <struct defGeompoint> defPoints;

In ONE .cpp file only, use
std::vector <struct defGeompoint> defPoints;

A better idea would be to do this without using a global variable to begin with.