the return value of difference_type function in iterator.h is difference_type*

TinySTL/Detail/Alloc.cpp

 #include "../Alloc.h"
 
 namespace TinySTL{
+
 	char *alloc::start_free = 0;
 	char *alloc::end_free = 0;
 	size_t alloc::heap_size = 0;
+
 	alloc::obj *alloc::free_list[alloc::ENFreeLists::NFREELISTS] = {
 		0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
 	};

TinySTL/Iterator.h

@@ -101,7 +101,7 @@ namespace TinySTL{
 		return static_cast<typename iterator_traits<Iterator>::value_type*>(0);
 	}
 	template<class Iterator>
-	inline typename iterator_traits<Iterator>::difference_type
+	inline typename iterator_traits<Iterator>::difference_type*
 		difference_type(const Iterator& It){
 		return static_cast<typename iterator_traits<Iterator>::difference_type*>(0);
 	}