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//GState.h//
#include "GStateFlow.h"
class GStateFlow;
class GState
{
  public:
  virtual void NextState(GStateFlow* State)=0;
};
class LoaderStateUNKNOWN:public GState
{
  public:
  virtual void NextState(GStateFlow* State)
  {
    ShowMessage("State is UNKNOWN,turn to Reset");
    State->SetState(new LoaderStateRESET());
  }
};
class LoaderStateRESET:public GState
{
  public:
  virtual void NextState(GStateFlow* State)
  {
    ShowMessage("State is Reset.");
  }
};
 
//GStateFlow.h
#include "GState.h"
class GState;
class GStateFlow
{
  public:
  GStateFlow(){this->CurrentState = new LoaderStateUNKNOWN();}
  ~GStateFlow(){delete CurrentState;}
  void SetState(GState* State){CurrentState=State;}
  void NextState(){CurrentState->NextState(this);}
  protected:
  GState* CurrentState;
};

prog.cpp:2:24: error: GStateFlow.h: No such file or directory
prog.cpp:28:20: error: GState.h: No such file or directory
prog.cpp: In member function ‘virtual void LoaderStateUNKNOWN::NextState(GStateFlow*)’:
prog.cpp:14: error: ‘ShowMessage’ was not declared in this scope
prog.cpp:15: error: invalid use of incomplete type ‘struct GStateFlow’
prog.cpp:3: error: forward declaration of ‘struct GStateFlow’
prog.cpp:15: error: expected type-specifier before ‘LoaderStateRESET’
prog.cpp:15: error: expected `)' before ‘LoaderStateRESET’
prog.cpp: In member function ‘virtual void LoaderStateRESET::NextState(GStateFlow*)’:
prog.cpp:23: error: ‘ShowMessage’ was not declared in this scope

Standard output is empty