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Merge #21498: refactor: return std::nullopt instead of {}
5294f0d5a94cc7beaf692131fba0cad8beec9f13 refactor: return std::nullopt instead of {} (fanquake) Pull request description: In #21415 [we decided](https://github.com/bitcoin/bitcoin/pull/21415#issuecomment-800236640) to return `std::optional` rather than `{}` for uninitialized values. This PR replaces the two remaining usages of `{}` with `std::nullopt`. As a side-effect, this also quells the spurious GCC 10.2.x warning that we've had reported quite a few times. i.e #21318, #21248, #20797. ```bash txmempool.cpp: In member function ‘CTxMemPool::setEntries CTxMemPool::GetIterSet(const std::set<uint256>&) const’: txmempool.cpp:898:13: warning: ‘<anonymous>’ may be used uninitialized in this function [-Wmaybe-uninitialized] 898 | return {}; | ^ ``` ACKs for top commit: hebasto: ACK 5294f0d5a94cc7beaf692131fba0cad8beec9f13, I have reviewed the code and it looks OK, I agree it can be merged. Tree-SHA512: 5b776be79ab26e5a3a5fc2b463b394ea5ce6797ed5558424873fa4ecee2898170eff76d6da9d69394d28f8f98974117fc63b922a3e19c52f5294c83073e79bb0
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@ -1387,7 +1387,7 @@ std::optional<CTxMemPool::txiter> CTxMemPool::GetIter(const uint256& txid) const
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{
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auto it = mapTx.find(txid);
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if (it != mapTx.end()) return it;
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return {};
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return std::nullopt;
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}
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CTxMemPool::setEntries CTxMemPool::GetIterSet(const std::set<uint256>& hashes) const
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@ -5604,7 +5604,7 @@ std::optional<uint256> ChainstateManager::SnapshotBlockhash() const {
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// If a snapshot chainstate exists, it will always be our active.
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return m_active_chainstate->m_from_snapshot_blockhash;
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}
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return {};
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return std::nullopt;
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}
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std::vector<CChainState*> ChainstateManager::GetAll()
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