Identifier "function_name" is undefined when calling a function [closed] - c++

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I have declared a function bool Network::areFriends(User & usr1, User & usr2) which when called unfortunately I am met with
identifier "function_name" is undefined
And the classes in which I am referring to.
Wall.h
#pragma once
class Wall
{
private:
std::list<Message> msgs_posted;
User* w_owner;
public:
Wall() = delete;
Wall(User* wownr);
virtual ~Wall();
void postMsg(User& usr ,Message msg);
void toString();
std::list<Message> getMsgsPosted();
};
Wall.cpp
#include "pch.h"
#include <iostream>
Wall::Wall(User * wownr)
:w_owner(wownr)
{
}
Wall::~Wall()
{
}
void Wall::postMsg(User& usr, Message msg)
{
//if are friends
if ((usr == *this->w_owner) || areFriends(usr,*this->w_owner)){
msgs_posted.push_back(msg);
/* does it get copied altogether? */
}
else
std::cout << "You can not post at this person's wall." << std::endl;
}
void Wall::toString()
{
std::list<Message> ::iterator tmp_it;
for (tmp_it = msgs_posted.begin(); tmp_it!= msgs_posted.end(); tmp_it++) {
tmp_it->toString();
}
std::cout << std::endl;
}
std::list<Message> Wall::getMsgsPosted()
{
return msgs_posted;
}
Network.h
#pragma once
class Network
{
private:
/* Singleton Implementation */
static Network* instance;
Network();
/* Misc */
std::list<User> users;
std::list<User>::iterator usr_it;
std::map<User, std::list<User*> > connections; // maybe pointer to users list?
std::map<User, std::list<User*> >::iterator map_it;
public:
/* Singleton Implementation */
Network(const Network&) = delete;
Network& operator=(const Network&) = delete;
~Network();
static Network& getInstance();
/* Other methods */
bool u_Exists(User& usr);
void addUser();
void addUser(User& usr);
void deleteUser(User& usr);
void connectUsers(User& usr1, User& usr2);
std::list<User> hasFriends(User& usr);
bool areFriends(User& usr1, User& usr2);
std::list<User> commonFriends(User* usr1, User* usr2);
};
Network.cpp
#include "pch.h"
#include <iostream>
Network::Network()
{}
...
Network& Network::getInstance()
{
static Network instance;
return instance;
}
bool Network::areFriends(User & usr1, User & usr2)
{
if (usr1 == usr2) {
return false;
}
else /*to be added*/{
return false;
}
}
The function that I am referring to is bool Network::areFriends(User & usr1, User & usr2) , used in
void Wall::postMsg(User& usr, Message msg)
{
//if are friends
if ((usr == *this->w_owner) || areFriends(usr,*this->w_owner)){
If needed I will post the rest of the classes but didn't due to size.

Answer 1

So shouldn't it be something like this
if ((usr == *this->w_owner) || Network::getInstance().areFriends(usr,*this->w_owner)){
In the code you've posted there's no instance of Network to call the areFriends function on.