unordered.h

// Copyright (c) 2010 Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
//     * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
//     * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

// Include this file to use unordered_map and unordered_set.  If tr1
// or C++11 is not available, you can switch to using hash_set and
// hash_map by defining BP_USE_HASH_SET.

#ifndef COMMON_UNORDERED_H_
#define COMMON_UNORDERED_H_

#if defined(BP_USE_HASH_SET)
#include <hash_map>
#include <hash_set>

// For hash<string>.
#include "util/hash/hash.h"

template <class T, class U, class H = __gnu_cxx::hash<T> >
struct unordered_map : public hash_map<T, U, H> {};
template <class T, class H = __gnu_cxx::hash<T> >
struct unordered_set : public hash_set<T, H> {};

#elif defined(_LIBCPP_VERSION)  // c++11
#include <unordered_map>
#include <unordered_set>
using std::unordered_map;
using std::unordered_set;

#else  // Fallback to tr1::unordered
#include <tr1/unordered_map>
#include <tr1/unordered_set>
using std::tr1::unordered_map;
using std::tr1::unordered_set;
#endif

#endif  // COMMON_UNORDERED_H_