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/* Copyright 2012 10gen Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "mongo/base/string_data.h"
#include <ostream>
#include <third_party/murmurhash3/MurmurHash3.h>
namespace mongo {
namespace {
template <int SizeofSizeT>
size_t murmur3(const StringData& str);
template <>
size_t murmur3<4>(const StringData& str) {
uint32_t hash;
MurmurHash3_x86_32(str.rawData(), str.size(), 0, &hash);
return hash;
}
template <>
size_t murmur3<8>(const StringData& str) {
uint64_t hash[2];
MurmurHash3_x64_128(str.rawData(), str.size(), 0, hash);
return static_cast<size_t>(hash[0]);
}
} // namespace
std::ostream& operator<<(std::ostream& stream, const StringData& value) {
return stream.write(value.rawData(), value.size());
}
size_t StringData::Hasher::operator() (const StringData& str) const {
return murmur3<sizeof(size_t)>(str);
}
} // namespace mongo
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