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+// Protocol Buffers - Google's data interchange format
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+// Copyright 2008 Google Inc. All rights reserved.
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+// https://developers.google.com/protocol-buffers/
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+//
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+// Redistribution and use in source and binary forms, with or without
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+// modification, are permitted provided that the following conditions are
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+// met:
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+//
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+// * Redistributions of source code must retain the above copyright
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+// notice, this list of conditions and the following disclaimer.
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+// * Redistributions in binary form must reproduce the above
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+// copyright notice, this list of conditions and the following disclaimer
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+// in the documentation and/or other materials provided with the
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+// distribution.
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+// * Neither the name of Google Inc. nor the names of its
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+// contributors may be used to endorse or promote products derived from
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+// this software without specific prior written permission.
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+//
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+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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+
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+#ifndef GOOGLE_PROTOBUF_STUBS_PBCONFIG_H__
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+#define GOOGLE_PROTOBUF_STUBS_PBCONFIG_H__
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+
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+#define GOOGLE_PROTOBUF_HAVE_HASH_MAP 1
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+#define GOOGLE_PROTOBUF_HAVE_HASH_SET 1
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+
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+// Use C++11 unordered_{map|set} if available.
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+#if __cplusplus >= 201103L || defined(__GXX_EXPERIMENTAL_CXX0X)
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+# define GOOGLE_PROTOBUF_HAS_CXX11_HASH
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+
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+// For XCode >= 4.6: the compiler is clang with libc++.
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+// For earlier XCode version: the compiler is gcc-4.2.1 with libstdc++.
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+// libc++ provides <unordered_map> and friends even in non C++11 mode,
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+// and it does not provide the tr1 library. Therefore the following macro
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+// checks against this special case.
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+// Note that we should not test the __APPLE_CC__ version number or the
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+// __clang__ macro, since the new compiler can still use -stdlib=libstdc++, in
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+// which case <unordered_map> is not compilable without -std=c++11
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+#elif defined(__APPLE_CC__)
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+# if defined(_LIBCPP_VERSION)
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+# define GOOGLE_PROTOBUF_HAS_CXX11_HASH
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+# elif __GNUC__ >= 4
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+# define GOOGLE_PROTOBUF_HAS_TR1
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+# else
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+// Not tested for gcc < 4... These setting can compile under 4.2.1 though.
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+# define GOOGLE_PROTOBUF_HASH_NAMESPACE __gnu_cxx
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+# define GOOGLE_PROTOBUF_HASH_MAP_H <ext/hash_map>
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+# define GOOGLE_PROTOBUF_HASH_MAP_CLASS hash_map
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+# define GOOGLE_PROTOBUF_HASH_SET_H <ext/hash_set>
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+# define GOOGLE_PROTOBUF_HASH_SET_CLASS hash_set
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+# endif
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+
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+// Version checks for gcc.
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+#elif defined(__GNUC__)
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+// For GCC 4.x+, use tr1::unordered_map/set; otherwise, follow the
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+// instructions from:
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+// https://gcc.gnu.org/onlinedocs/libstdc++/manual/backwards.html
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+# if __GNUC__ >= 4
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+# define GOOGLE_PROTOBUF_HAS_TR1
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+# elif __GNUC__ >= 3
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+# define GOOGLE_PROTOBUF_HASH_MAP_H <backward/hash_map>
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+# define GOOGLE_PROTOBUF_HASH_MAP_CLASS hash_map
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+# define GOOGLE_PROTOBUF_HASH_SET_H <backward/hash_set>
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+# define GOOGLE_PROTOBUF_HASH_SET_CLASS hash_set
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+# if __GNUC__ == 3 && __GNUC_MINOR__ == 0
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+# define GOOGLE_PROTOBUF_HASH_NAMESPACE std // GCC 3.0
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+# else
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+# define GOOGLE_PROTOBUF_HASH_NAMESPACE __gnu_cxx // GCC 3.1 and later
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+# endif
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+# else
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+# define GOOGLE_PROTOBUF_HASH_NAMESPACE
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+# define GOOGLE_PROTOBUF_HASH_MAP_H <hash_map>
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+# define GOOGLE_PROTOBUF_HASH_MAP_CLASS hash_map
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+# define GOOGLE_PROTOBUF_HASH_SET_H <hash_set>
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+# define GOOGLE_PROTOBUF_HASH_SET_CLASS hash_set
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+# endif
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+
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+// Version checks for MSC.
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+// Apparently Microsoft decided to move hash_map *back* to the std namespace in
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+// MSVC 2010:
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+// http://blogs.msdn.com/vcblog/archive/2009/05/25/stl-breaking-changes-in-visual-studio-2010-beta-1.aspx
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+// And.. they are moved back to stdext in MSVC 2013 (haven't checked 2012). That
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+// said, use unordered_map for MSVC 2010 and beyond is our safest bet.
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+#elif defined(_MSC_VER)
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+# if _MSC_VER >= 1600 // Since Visual Studio 2010
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+# define GOOGLE_PROTOBUF_HAS_CXX11_HASH
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+# define GOOGLE_PROTOBUF_HASH_COMPARE std::hash_compare
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+# elif _MSC_VER >= 1500 // Since Visual Studio 2008
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+# define GOOGLE_PROTOBUF_HAS_TR1
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+# define GOOGLE_PROTOBUF_HASH_COMPARE stdext::hash_compare
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+# elif _MSC_VER >= 1310
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+# define GOOGLE_PROTOBUF_HASH_NAMESPACE stdext
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+# define GOOGLE_PROTOBUF_HASH_MAP_H <hash_map>
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+# define GOOGLE_PROTOBUF_HASH_MAP_CLASS hash_map
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+# define GOOGLE_PROTOBUF_HASH_SET_H <hash_set>
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+# define GOOGLE_PROTOBUF_HASH_SET_CLASS hash_set
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+# define GOOGLE_PROTOBUF_HASH_COMPARE stdext::hash_compare
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+# else
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+# define GOOGLE_PROTOBUF_HASH_NAMESPACE std
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+# define GOOGLE_PROTOBUF_HASH_MAP_H <hash_map>
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+# define GOOGLE_PROTOBUF_HASH_MAP_CLASS hash_map
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+# define GOOGLE_PROTOBUF_HASH_SET_H <hash_set>
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+# define GOOGLE_PROTOBUF_HASH_SET_CLASS hash_set
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+# define GOOGLE_PROTOBUF_HASH_COMPARE stdext::hash_compare
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+# endif
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+
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+// **ADD NEW COMPILERS SUPPORT HERE.**
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+// For other compilers, undefine the macro and fallback to use std::map, in
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+// google/protobuf/stubs/hash.h
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+#else
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+# undef GOOGLE_PROTOBUF_HAVE_HASH_MAP
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+# undef GOOGLE_PROTOBUF_HAVE_HASH_SET
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+#endif
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+
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+#if defined(GOOGLE_PROTOBUF_HAS_CXX11_HASH)
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+# define GOOGLE_PROTOBUF_HASH_NAMESPACE std
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+# define GOOGLE_PROTOBUF_HASH_MAP_H <unordered_map>
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+# define GOOGLE_PROTOBUF_HASH_MAP_CLASS unordered_map
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+# define GOOGLE_PROTOBUF_HASH_SET_H <unordered_set>
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+# define GOOGLE_PROTOBUF_HASH_SET_CLASS unordered_set
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+#elif defined(GOOGLE_PROTOBUF_HAS_TR1)
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+# define GOOGLE_PROTOBUF_HASH_NAMESPACE std::tr1
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+# define GOOGLE_PROTOBUF_HASH_MAP_H <tr1/unordered_map>
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+# define GOOGLE_PROTOBUF_HASH_MAP_CLASS unordered_map
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+# define GOOGLE_PROTOBUF_HASH_SET_H <tr1/unordered_set>
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+# define GOOGLE_PROTOBUF_HASH_SET_CLASS unordered_set
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+#endif
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+
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+#undef GOOGLE_PROTOBUF_HAS_CXX11_HASH
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+#undef GOOGLE_PROTOBUF_HAS_TR1
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+
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+#endif // GOOGLE_PROTOBUF_STUBS_PBCONFIG_H__
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Jisi Liu