synchronized_pool_resource(const pool_options& opts, memory_resource* upstream);
unsynchronized_pool_resource(const pool_options& opts, memory_resource* upstream);
Effects: Constructs a pool resource object that will obtain memory from upstream whenever the pool resource is unable to satisfy a memory request from its own internal data structures. The resulting object will hold a copy of upstream, but will not own the resource to which upstream points. [ Note: The intention is that calls to upstream->allocate() will be substantially fewer than calls to this->allocate() in most cases. — end note ] The behavior of the pooling mechanism is tuned according to the value of the opts argument.
Throws: Nothing unless upstream->allocate() throws. It is unspecified if, or under what conditions, this constructor calls upstream->allocate().