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Showing content from https://en.cppreference.com/w/cpp/language/../memory/weak_ptr/../pool_options.html below:

std::pmr::pool_options - cppreference.com

struct pool_options;

(since C++17)

std::pmr::pool_options is a set of constructor options for pool resources including std::pmr::synchronized_pool_resource and std::pmr::unsynchronized_pool_resource.

[edit] Data members Member Meaning The maximum number of blocks that will be allocated at once from the upstream std::pmr::memory_resource to replenish the pool. If the value of max_blocks_per_chunk is zero or is greater than an implementation-defined limit, that limit is used instead. The implementation may choose to use a smaller value than is specified in this field and may use different values for different pools. The largest allocation size that is required to be fulfilled using the pooling mechanism. Attempts to allocate a single block larger than this threshold will be allocated directly from the upstream std::pmr::memory_resource. If largest_required_pool_block is zero or is greater than an implementation-defined limit, that limit is used instead. The implementation may choose a pass-through threshold larger than specified in this field. [edit] See also

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