Function is not visible to linker

Question

First a little code:

class CDb
{
public:
    void CreateLeague(const League &data);
protected:
    int InsertOwners(const std::vector<std::string> &owners, int leagueId);
};

void CDb::CreateLeague(const League &data)
{
    // some code 
    if( InsertOwners( data.GetOwners(), leagueId ) != SQLITE_OK )
    {
      // ROLLBACK transaction
    }
}

int CDb::InsertOwners(const std::vector<std::string> &owners, int leagueId)
{
}

Function GetOwners() is declared as:

std::vector<std::string> &GetOwners() const;

During linking I'm getting following:

unresolved external symbol "protected: int __thiscall CDb::InsertOwners(class std::vector,class std::allocator >,class std::allocator,class std::allocator > > > const &,int)" (?InsertOwners@CDb@@IAEHABV?$vector@V?$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@@H@Z) referenced in function "public: void __thiscall CDb::CreateLeague(class CLeagueSettings const &)" (?CreateLeague@CDb@@QAEXABVCLeagueSettings@@@Z) 1>vc_mswud\baseballdraft.exe : fatal error LNK1120: 1 unresolved externals

Using MSVC 2010 on Windows 7.

Please help.

Are you sure the file that contains the implementation of CDb::InsertOwners() is part of the project and actually getting compiled? — Frédéric Hamidi

Ajay Ajay · Accepted Answer · 2012-10-12T08:10:06

Ensure that following code gets compiled:

int CDb::InsertOwners(const std::vector<std::string> &owners, int leagueId) 
{ 
}

Check if this is into another source file (.CPP), and that particular file is included in project. If this is actual code, it would give error, since it is missing return statement.

Function is not visible to linker

2 Answers