src/kudu/util/shared_ptr_util.h

// Copyright 2015 Cloudera, 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.

#ifndef KUDU_UTIL_SHARED_PTR_UTIL_H_
#define KUDU_UTIL_SHARED_PTR_UTIL_H_

#include <cstddef>
#include <tr1/memory>

namespace kudu {

// This is needed on TR1. With C++11, std::hash<std::shared_ptr<>> is provided.
template <class T>
struct SharedPtrHashFunctor {
  std::size_t operator()(const std::tr1::shared_ptr<T>& key) const {
    return reinterpret_cast<std::size_t>(key.get());
  }
};

} // namespace kudu

#endif // KUDU_UTIL_SHARED_PTR_UTIL_H_