typdef in g++

Hi everyone
   
  I have some declaration in public: section of one class like this...
   
  ----------------------------------
  file "a.h"
  ----------------------------------
   
  template<class T> class example 
  {
  public:
   typedef  std::vector <T*>    TMem;
 typedef typename TMem::iterator   TMemIter;
 typedef typename TMem::const_iterator TMemConIter;
 typedef typename TMem::size_type  TMemSize;
  };
   
   
  -------------------------------------------------
  file "b.h"
  ---------------------------------------------------
   
  #include "a.h"
  .............
  ..............
  func()
  {
     for (TMemConIter iterMemb = iMem.begin (); iterMemb != iMem.end (); iterMemb++)
   
  }
  ........
  ........
  ..........
  i compile this with g++ compiler and gets error  
   
  `TMemConIter' undeclared (first use this function)"
   
  Can anybody help please ?
   
  Thanks

 				
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