heron/common/src/cpp/basics/sphash.h

/*
 * Copyright 2015 Twitter, 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.
 */

////////////////////////////////////////////////////////////////////////////////
// Define some hash functions for hash_set/hash_map and stuff
///////////////////////////////////////////////////////////////////////////////

#ifndef __SP_HASH_H
#define __SP_HASH_H

#include <functional>
#include <string>
#include <utility>
#include "basics/ridgen.h"

namespace std {

template <>
struct hash<std::pair<std::string, std::string> > {
  std::size_t operator()(const pair<std::string, std::string> &key) const {
    return std::hash<std::string>()(key.first + key.second);
  }
};

template <>
struct hash<std::pair<std::string, sp_int32> > {
  std::size_t operator()(const pair<std::string, sp_int32> &key) const {
    return std::hash<std::string>()(key.first) ^ std::hash<sp_int32>()(key.second);
  }
};

template <>
struct hash<REQID> {
  size_t operator()(const REQID &key) const { return std::hash<std::string>()(key.str()); }
};

}  // namespace std

#endif  // __HASHFN_H