_allocator.html#ab8733c1237be93ee28664e4b983d535c" title="Short-hand for the Arena type this uses for allocation/deallocation/pointer semantics.">Arena_obj</a> is set up in such a way as to map all processes' locally-dereferenceable pointers to the same SHM location to the same numeric value (by specifying each pool's start as some predetermined numerical value in the huge 64-bit vaddr space &ndash; in all processes sharing that SHM pool. Now no address translation is needed, and <code>Arena::Pointer</code>