I can't solve "unresolved external" - c++

Question

1>game.obj : error LNK2001: unresolved external symbol "public: bool __cdecl GameStore::loadFromXml(void)" (?loadFromXml#GameStore##QEAA_NXZ)
1>protocolgame.obj : error LNK2001: unresolved external symbol "public: struct StoreCategory * __cdecl GameStore::getStoreCategoryByName(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const &)" (?getStoreCategoryByName#GameStore##QEAAPEAUStoreCategory##AEBV?$basic_string#DU?$char_traits#D#std##V?$allocator#D#2##std###Z)
1>C:\Users\Slavi Dodo\Documents\GitHub\forgottenserver\vc14\x64\Release\theforgottenserver.exe : fatal error LNK1120: 2 unresolved externals
I am so confused! I don't even understand why the error comes.
These is the declaration "gamestore.h"
#ifndef FS_GAMESTORE_H_ADCAA356C0DB44CEBA994A0D678EC92D
#define FS_GAMESTORE_H_ADCAA356C0DB44CEBA994A0D678EC92D
struct StoreOffer {
StoreOffer(uint32_t id, uint32_t thingId, uint8_t addon, uint32_t price, uint8_t type, uint8_t state, std::string name, std::string description, std::vector<std::string> icons)
: id(id), thingId(thingId), addon(addon), price(price), type(type), state(state), name(name), description(description), icons(icons) {}
uint32_t id;
uint32_t thingId;
uint32_t price;
uint8_t type;
uint8_t state;
uint8_t addon;
std::string name;
std::string description;
std::vector<std::string> icons;
};
struct StoreCategory
{
StoreCategory(std::string name, std::string description, std::vector<std::string> icons, std::vector<StoreOffer> offers)
: name(name), description(description), icons(icons), offers(offers) {}
std::string name;
std::string description;
std::string parentCategory;
std::vector<std::string> icons;
std::vector<StoreOffer> offers;
};
class GameStore
{
public:
bool reload();
bool loadFromXml();
StoreOffer* getStoreItemById(uint32_t id);
StoreCategory* getStoreCategoryByName(const std::string& name);
const std::vector<StoreCategory>& getStoreCategories() const {
return storeCategories;
}
bool enabled;
std::vector<StoreCategory> storeCategories;
};
#endif
And this is the definitions "gamestore.cpp"
#include "otpch.h"
#include "gamestore.h"
#include "pugicast.h"
#include "tools.h"
bool GameStore::reload()
{
storeCategories.clear();
return loadFromXml();
}
bool GameStore::loadFromXml()
{
return true;
}
StoreOffer* GameStore::getStoreItemById(uint32_t id) {
for (auto it : storeCategories) {
for (auto item : it.offers) {
if (item.id == id) {
return &item;
}
}
}
return nullptr;
}
StoreCategory* GameStore::getStoreCategoryByName(const std::string& name) {
auto it = std::find_if(storeCategories.begin(), storeCategories.end(), [name](StoreCategory& storeCategory) {
return storeCategory.name == name;
});
return it != storeCategories.end() ? &*it : nullptr;
}
I have read more about the error, but not even found a solution to my situation.
As you see the "loadFromXml" is just returning true, not accepting any arguments as well being public, the problem is very confusing!

Answer 1

Check if gamestore.cpp is being compiled or not!
If not add it to projectname.vcproj in CLCompile list.