How am I getting a linker error: Unresolved external symbol

Question

This is in a Windows Console application, so I have no idea how this is happening at all.

#include "Library.h"

//poglathon.cpp
//starting region


bool Poglathon(std::vector<std::string>& text,Player *player){
    using namespace std;
    cout << "You see a town to one side and a path leading to a dark, murky forest in the other side." << endl;
    int chosen = player->giveOptions(2,"Town","Path","","","");
    return true;
}

Further to Let_Me_Be's question: Pig Head, please show us the exact linker error message. — Gareth McCaughan
– Gareth McCaughan, Commented Mar 21, 2011 at 18:58
(keep clicking comment-up accidentally) bool __cdecl - is that the symbol? — pighead10
– pighead10, Commented Mar 21, 2011 at 18:58
Here's the entire message: error LNK2019: unresolved external symbol "bool __cdecl Poglathon(class std::vector<class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >,class std::allocator<class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > > > &,class Player)" (?Poglathon@@YA_NAAV?$vector@V?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@V?$allocator@V?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@@2@@std@@VPlayer@@@Z) referenced in function _main — pighead10
– pighead10, Commented Mar 21, 2011 at 18:59
Poglathon is the symbol. Please provide the definition, the declaration and the call statement of Poglathon. — Yakov Galka
– Yakov Galka, Commented Mar 21, 2011 at 19:03
Poglathon(vec, 0); // bang, you're dead Check for null (a valid pointer value!) or use a reference. — GManNickG
– GManNickG, Commented Mar 21, 2011 at 19:10

Erik · Accepted Answer · 2011-03-21 19:06:04Z

3

Your declaration in the header file looks like this:

bool Poglathon(std::vector<std::string>& text,Player player);

Your attempt to define in the cpp file looks like this:

bool Poglathon(std::vector<std::string>& text,Player * player);

Change the declaration to take a Player * instead of a Player

answered Mar 21, 2011 at 19:06

Erik

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Yakov Galka · Accepted Answer · 2011-03-21 19:06:09Z

2

Apparently the problem is that the declaration of the function (inside your header files) is like this:

bool Poglathon(std::vector<std::string>& text,Player player);

But you defined it like this:

bool Poglathon(std::vector<std::string>& text,Player *player)

Decide what you want and be consistent.

answered Mar 21, 2011 at 19:06

Yakov Galka

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1 Comment

pighead10 Over a year ago

Whoops, I forgot about that declaration.

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