difference_type 97 gc/include/gc_allocator.h typedef ptrdiff_t difference_type; difference_type 144 gc/include/gc_allocator.h typedef ptrdiff_t difference_type; difference_type 178 gc/include/gc_allocator.h typedef ptrdiff_t difference_type; difference_type 220 gc/include/gc_allocator.h typedef ptrdiff_t difference_type;