Linker Error "undefinied reference to" Encounter::enemy

[Falke88]

Hey guys,

Sadly I can't get along a Linker Error here. I don't even known why. I added all files to my project so they compile - did nothing new with Encounter.h and Encounter.hpp - same procedure like always. But now it throws a linker error message.


main.cpp:

// KI Projekt 2.0 (c) Patrick Höfer


#include <fstream>
#include <iostream>
#include <string>
#include "Controls.h"
#include "Screen_output.h"
#include "Encounter.h"


using namespace std;



	
int main()
{
	
	

	draw.create_field("field.txt");
	draw.screen("title.txt");
	
	for(;;)
	{
		int x = ctrl.choose();
		
		if (x == 1)
		{
			(system("CLS"));
			for(;;)
			{
				draw.field();
			}
		}
		else
			std::cout << "Diese Option ist nicht möglich";
	}
	
		
	
	
	
	
	



    system("PAUSE");
    return EXIT_SUCCESS;
}

Encounter.h:

#ifndef Encounter_h
#define Encounter_h


class Encounter
{
	public:
	void enemy();
};

extern Encounter enc;



#endif  

Encounter.hpp:

#include <iostream>
#include <fstream>
#include <string>
#include "Screen_output.h"
#include "Controls.h"
#include "Encounter.h"


Encounter enc;

void Encounter::enemy()
{
	draw.screen("enemy.txt");
}

I hope its not just a trivial error that I didn't managed to find here :(

[mutexe]

It could be originating from the files you haven't shown us i.e. "Controls" and/or "Screen_output". Your compiler should tell you.
and can you explain what you're doing on line 11 of your header file?

[firedraco]

Did you mean to call it Encounter.cpp instead of .hpp? That might be causes the problem as well.

[Falke88]

hm - as I renamed it to .cpp it works - I thought there wouldn't be an issue with .hpp and .cpp since they are both source files? What are the differences?

[AbstractionAnon]

.hpp is considered a header file and won't get compiled. It's meant to be included like a .h file.

Only .cpp files gets compiled. File extensions recognized as source files vary by implementation. e.g. Some compilers recognize .cxx files also.