无法让这个带有模板的类工作？

我正试图用一个通用对象在C++中编写类似C#接口的东西，但我无法实现。每次我在main中创建一个新实例时，我都会收到以下错误：错误1错误LNK2019：未解析的外部符号"public:__thiscall AccountRepository:：AccountRepository(void)">

main.cpp

#include <iostream>
#include <stdio.h>
#include <string>
#include "AccountRepository.h"
using namespace std;
int main(){
AccountRepository repo;
return 0;
}

IRepository.h

#pragma once
#include <vector>
using namespace std;
template <class Entity>
class IRepository
{
public:
virtual bool add(Entity entity) = 0;
virtual bool update(Entity entity) = 0;
virtual Entity getById(int Id) = 0;
virtual bool remove(Entity entity) = 0;
virtual vector<Entity> getAll() = 0;
};

AccountRepository.h

#pragma once
#include "IRepository.h"
#include "Account.h"
#include <vector>
class AccountRepository : public IRepository<Account>{
private:
vector<Account> _accounts;
public:
AccountRepository();
~AccountRepository();
virtual bool add(Account entity) override;
virtual bool update(Account entity) override;
virtual Account getById(int Id) override;
virtual bool remove(Account entity) override;
virtual vector<Account> getAll() override;
};

AccountReposity.cpp

#include "AccountRepository.h"
inline AccountRepository::AccountRepository()
{
}
inline AccountRepository::~AccountRepository()
{
}
inline bool AccountRepository::add(Account entity)
{
_accounts.push_back(entity);
return true;
}
inline bool AccountRepository::update(Account entity)
{
for (Account account : _accounts){
if (account.getId() == entity.getId()){
account.setName(entity.getName());
account.setDescription(entity.getDescription());
return true;
}
}
return false;
}
inline Account AccountRepository::getById(int Id)
{
for (Account account: _accounts)
{
if (account.getId() == Id)
return account;
}
}
inline bool AccountRepository::remove(Account entity)
{
vector<Account>::iterator it;
for (it = _accounts.begin(); it != _accounts.end(); ++it){
if (it->getId() == entity.getId())
{
_accounts.erase(it);
return true;
}
}
return false;
}
inline vector<Account> AccountRepository::getAll()
{
return _accounts;
}