Pointer to a object class throwing "does not name a type"

I have开发者_StackOverflow中文版 a hardware class having a pointer to a TLB class object, and initialising that in the constructor. However, Codeblocks (GNU GCC) is giving me the error "proj3_hardware.h|15|error: 'TLB' does not name a type" "proj3_hardware.h|15|error: expected ';' before '*' token"

I just cannot see where is the error in the code. Thank you.

proj3_hardware.h

#include <iostream>
#include "proj3_globals.h"
#include "proj3_pagetable.h"
#include "proj3_tlb.h"

class Hardware{

public:

    // Defines the hardware parts
    int global_simulation_time;
    TLB* tlb;
    PageManagement* pagemm;

    // Hardware constructor and methods
    Hardware(int pageTableType, int replacementAlgo);

    void execute();
    void diskaccess();

};

proj3_tlb.h

#include <iostream>
#include "proj3_globals.h"

// Assumes that the TLB is using LRU

class TLBEntry{

    public:

        char validEntry;
        int VirtualAddress;
        int PhysicalAddress;
        long LastUsed;
};

class TLB{

    private:

        TLBEntry entries[HARDWARE_TLBSIZE];
        int* simulation_time;

    public:

        TLB(int* simulation_time);

        void tlb_add(int virtualaddress, int physicaladdress);
        int tlb_lookup(int virtualaddress);
        void tlb_flush();

};

Compiles for me.

The error must be in other code; Check your other header files for:

• any suspicious #defines
• missing semicolons?
• wrong include guards (this one is my best guess)