pad request, checking for minimum (but not maximum)

Many STL algorithms use swap instead of copy constructors

* Returns a function to use in pseudos for positionals * @param {Function} fn

Ptr to next or previous physical malloc_chunk.

also tests for erased values ----------------------------

TODO(csilvers): make protected + friend This is used by sparse_hashtable to get an element from the table when we know it exists.

chunk associated with aligned address A

Needed for hashtables, gets as a ne_iterator. Crashes for empty bcks

Set size, pinuse bit, foot, and clear next pinuse

the number of bytes to offset an address to align it