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Allow BatchWrite to destroy its input, reducing copying

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This commit is contained in:
Pieter Wuille
2014-08-24 02:08:05 +02:00
parent 5cd00bc8cb
commit b0875eb3fe
4 changed files with 21 additions and 14 deletions
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16
src/coins.cpp
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@@ -57,7 +57,7 @@ bool CCoinsView::SetCoins(const uint256 &txid, const CCoins &coins) { return fal
bool CCoinsView::HaveCoins(const uint256 &txid) { return false; }
uint256 CCoinsView::GetBestBlock() { return uint256(0); }
bool CCoinsView::SetBestBlock(const uint256 &hashBlock) { return false; }
bool CCoinsView::BatchWrite(const CCoinsMap &mapCoins, const uint256 &hashBlock) { return false; }
bool CCoinsView::BatchWrite(CCoinsMap &mapCoins, const uint256 &hashBlock) { return false; }
bool CCoinsView::GetStats(CCoinsStats &stats) { return false; }
@@ -68,7 +68,7 @@ bool CCoinsViewBacked::HaveCoins(const uint256 &txid) { return base->HaveCoins(t
uint256 CCoinsViewBacked::GetBestBlock() { return base->GetBestBlock(); }
bool CCoinsViewBacked::SetBestBlock(const uint256 &hashBlock) { return base->SetBestBlock(hashBlock); }
void CCoinsViewBacked::SetBackend(CCoinsView &viewIn) { base = &viewIn; }
bool CCoinsViewBacked::BatchWrite(const CCoinsMap &mapCoins, const uint256 &hashBlock) { return base->BatchWrite(mapCoins, hashBlock); }
bool CCoinsViewBacked::BatchWrite(CCoinsMap &mapCoins, const uint256 &hashBlock) { return base->BatchWrite(mapCoins, hashBlock); }
bool CCoinsViewBacked::GetStats(CCoinsStats &stats) { return base->GetStats(stats); }
CCoinsKeyHasher::CCoinsKeyHasher() : salt(GetRandHash()) {}
@@ -130,17 +130,19 @@ bool CCoinsViewCache::SetBestBlock(const uint256 &hashBlockIn) {
return true;
}
bool CCoinsViewCache::BatchWrite(const CCoinsMap &mapCoins, const uint256 &hashBlockIn) {
for (CCoinsMap::const_iterator it = mapCoins.begin(); it != mapCoins.end(); it++)
cacheCoins[it->first] = it->second;
bool CCoinsViewCache::BatchWrite(CCoinsMap &mapCoins, const uint256 &hashBlockIn) {
for (CCoinsMap::iterator it = mapCoins.begin(); it != mapCoins.end();) {
cacheCoins[it->first].swap(it->second);
CCoinsMap::iterator itOld = it++;
mapCoins.erase(itOld);
}
hashBlock = hashBlockIn;
return true;
}
bool CCoinsViewCache::Flush() {
bool fOk = base->BatchWrite(cacheCoins, hashBlock);
if (fOk)
cacheCoins.clear();
cacheCoins.clear();
return fOk;
}