The classstd::pmr::synchronized_pool_resource is a general-purpose memory resource class with the following properties:

• It owns the allocated memory and frees it on destruction, even ifdeallocate has not been called for some of the allocated blocks.
• It consists of a collection ofpools that serves requests for different block sizes. Each pool manages a collection ofchunks that are then divided into blocks of uniform size.
• Calls todo_allocate are dispatched to the pool serving the smallest blocks accommodating the requested size.
• Exhausting memory in the pool causes the next allocation request for that pool to allocate an additional chunk of memory from theupstream allocator to replenish the pool. The chunk size obtained increases geometrically.
• Allocations requests that exceed the largest block size are served from theupstream allocator directly.
• The largest block size and maximum chunk size may be tuned by passing astd::pmr::pool_options struct to its constructor.

synchronized_pool_resource may be accessed from multiple threads without external synchronization, and may have thread-specific pools to reduce synchronization costs. If the memory resource is only accessed from one thread,unsynchronized_pool_resource is more efficient.

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