Use smartpointers for DagBlock and avoid unnecessary copies #2883
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Part of the codebase was using raw DagBlock objects, another part was using std::shared_ptr. As a result, we were making DagBlock object copies a lot, which is expensive... see
DagManager::getDagBlock(const blk_hash_t &hash)
methodThe codebase is now united and we are using only smart pointers...
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