20 Memory management library [mem]

20.4 Memory resources [mem.res]

20.4.5 Pool resource classes [mem.res.pool]

20.4.5.2 pool_options data members [mem.res.pool.options]

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The members of pool_options comprise a set of constructor options for pool resources.
The effect of each option on the pool resource behavior is described below:
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size_t max_blocks_per_chunk;
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The maximum number of blocks that will be allocated at once from the upstream memory resource ([mem.res.monotonic.buffer]) to replenish a 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.
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size_t largest_required_pool_block;
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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 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.