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/* Copyright 2013 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.
*/
#pragma once
// We need to drag in a C++ header so we can examine __GXX_EXPERIMENTAL_CXX0X__ or
// _LIBCPP_VERSION meaningfully. The <new> header is pretty lightweight, mostly unavoidable,
// and almost certain to bring in the standard library configuration macros.
#include <new>
// NOTE(acm): Before gcc-4.7, __cplusplus is always defined to be 1, so we can't reliably
// detect C++11 support by exclusively checking the value of __cplusplus. Additionaly, libc++,
// whether in C++11 or C++03 mode, doesn't use TR1 and drops things into std instead.
#if __cplusplus >= 201103L || defined(__GXX_EXPERIMENTAL_CXX0X__) || defined(_LIBCPP_VERSION)
#include <functional>
#define MONGO_HASH_NAMESPACE_START namespace std {
#define MONGO_HASH_NAMESPACE_END }
#define MONGO_HASH_NAMESPACE std
#elif defined(_MSC_VER) && _MSC_VER >= 1500
#if _MSC_VER >= 1600 /* Visual Studio 2010+ */
#include <functional>
#define MONGO_HASH_NAMESPACE_START namespace std {
#define MONGO_HASH_NAMESPACE_END }
#define MONGO_HASH_NAMESPACE std
#else /* Older Visual Studio */
#include <tr1/functional>
#define MONGO_HASH_NAMESPACE_START namespace std { namespace tr1 {
#define MONGO_HASH_NAMESPACE_END }}
#define MONGO_HASH_NAMESPACE std::tr1
#endif
#elif defined(__GNUC__)
#include <tr1/functional>
#define MONGO_HASH_NAMESPACE_START namespace std { namespace tr1 {
#define MONGO_HASH_NAMESPACE_END }}
#define MONGO_HASH_NAMESPACE std::tr1
#else
#error "Cannot determine namespace for 'hash'"
#endif
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