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Only hash key once if key not found, i.e. use [] instead of find() and then emplace()

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This commit is contained in:
Sebastian Messmer 2016-06-21 23:43:52 -07:00
parent 389273a24f
commit adb10343d2
1 changed files with 3 additions and 8 deletions
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11
src/blockstore/implementations/versioncounting/KnownBlockVersions.cpp
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@ -34,17 +34,12 @@ KnownBlockVersions::~KnownBlockVersions() {
bool KnownBlockVersions::checkAndUpdateVersion(const Key &key, uint64_t version) { bool KnownBlockVersions::checkAndUpdateVersion(const Key &key, uint64_t version) {
ASSERT(_valid, "Object not valid due to a std::move"); ASSERT(_valid, "Object not valid due to a std::move");
auto found = _knownVersions.find(key); uint64_t &found = _knownVersions[key]; // If the entry doesn't exist, this creates it with value 0.
if (found == _knownVersions.end()) { if (found > version) {
_knownVersions.emplace(key, version);
return true;
}
if (found->second > version) {
return false; return false;
} }
found->second = version; found = version;
return true; return true;
} }