From cppreference.com
virtualvoid*do_deallocate(void*p,std::size_tbytes,std::size_talignment)=0;(library fundamentals TS)Deallocates the storage pointed to by p. p shall have been returned by a prior call to allocate(bytes, alignment) on a memory_resource that compares equal to *this, and the storage it points to shall not yet have been deallocated.
Exceptions
Throws nothing.
See also