Error 2 files include each other - c++11

Question

i have this problems while trying to include 2 files each other:
./include/../include/../src/Socket/../LinuxClass/ThreadingPool.hpp:38:5:
error: ‘Client’ does not name a type
Client client;
I already find a solution about declaring the first class in the second files but the error is still there here is the 2 .h
#ifndef THREADINGPOOL_HPP_
#define THREADINGPOOL_HPP_
#include <functional>
#include <algorithm>
#include <queue>
#include "../Socket/Client.hpp"
#include "../Intefaces/IThread.hpp"
#include "Mutex.hpp"
#include "Thread.hpp"
#include "Condvar.hpp"
#include "Process.hpp"
class ThreadingPool {
public:
ThreadingPool(unsigned int num_thr);
~ThreadingPool();
void Add_fct(std::function<void()> job);
private:
enum States {LIVE, DIE};
std::vector<std::thread> thrdVec;
std::vector<States> states;
std::queue<std::function<void()>> jobs;
Mutex mtex;
Condvar cond;
Process pros;
Client client;
};
#endif /* !THREADINGPOOL_HPP_ */
And the second one
#ifndef CLIENT_HPP_
# define CLIENT_HPP_
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <functional>
#include <unistd.h>
#include <fcntl.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#define PORT 1043
#define METASIZE 1024
#include "check_cmd.hpp"
class ThreadingPool;
class Client {
public:
Client();
~Client();
void ifMessage(ThreadingPool * thrdPool);
private:
int csock;
struct sockaddr_in csin;
};
#endif

Answer 1

I think the problem you have is that you put # define (space between hashtag)
instead of #define (no space between hashtag)
i think the space between it causes the compiler to not
implement the code within client.hpp, because you are not getting a error
saying
client.hpp does not exist, instead a error saying client (the class) does not exist. without define being wrote correctly, the compiler pretty much skips past the code within #ifndef