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// string_map_internal.h
/* 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.
*/
namespace mongo {
inline size_t StringMapDefaultHash::operator()( const StringData& key ) const {
size_t mx = key.size();
size_t hash = 7;
for ( size_t i = 0; i < mx; i++ ) {
hash += ( 517 * static_cast<int>(key[i]) );
hash *= 13;
}
if ( hash == 0 )
hash = -1;
return hash;
}
}
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