[#CCoinsMap]
= CCoinsMap
:mrdocs:

PoolAllocator's MAX_BLOCK_SIZE_BYTES parameter here uses sizeof the data, and adds the size of 4 pointers. We do not know the exact node size used in the std::unordered_node implementation because it is implementation defined. Most implementations have an overhead of 1 or 2 pointers, so nodes can be connected in a linked list, and in some cases the hash value is stored as well. Using an additional sizeof(void*)*4 for MAX_BLOCK_SIZE_BYTES should thus be sufficient so that all implementations can allocate the nodes from the PoolAllocator.

== Synopsis

Declared in `<coins.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
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using CCoinsMap = std::unordered_map<COutPoint, CCoinsCacheEntry, SaltedCoinsCacheHasher, std::equal_to<COutPoint>, PoolAllocator<CoinsCachePair, sizeof(CoinsCachePair) + sizeof(void *) * 4>>;
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