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refactor: return std::nullopt instead of {}

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In #21415 we decided to return `std::optional` rather than `{}` for
uninitialized values. This PR repalces 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 {};
      |             ^
```
This commit is contained in:
fanquake 2021-03-22 11:22:06 +08:00
parent d2a78ee928
commit 5294f0d5a9
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2 changed files with 2 additions and 2 deletions
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2
src/validation.cpp
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@ -5186,7 +5186,7 @@ std::optional<uint256> ChainstateManager::SnapshotBlockhash() const {
// If a snapshot chainstate exists, it will always be our active.
return m_active_chainstate->m_from_snapshot_blockhash;
}
return {};
return std::nullopt;
}
std::vector<CChainState*> ChainstateManager::GetAll()