[ Note: The memory is released back to upstream_rsrc even if some blocks that were allocated from this have not been deallocated from this. — end note ]
memory_resource* upstream_resource() const;
void* do_allocate(size_t bytes, size_t alignment) override;
Effects: If the unused space in current_buffer can fit a block with the specified bytes and alignment, then allocate the return block from current_buffer; otherwise set current_buffer to upstream_rsrc->allocate(n, m), where n is not less than max(bytes, next_buffer_size) and m is not less than alignment, and increase next_buffer_size by an implementation-defined growth factor (which need not be integral), then allocate the return block from the newly-allocated current_buffer.
void do_deallocate(void* p, size_t bytes, size_t alignment) override;
bool do_is_equal(const memory_resource& other) const noexcept override;