Fix hash.h for MSVC and platforms without hash map/set support.

Change-Id: Ic0fdb52c17b9495c73b8ce15879531383a148585

src/google/protobuf/stubs/hash.h

@@ -89,16 +89,17 @@ struct hash<const char*> {
 
 template <typename Key, typename Data,
           typename HashFcn = hash<Key>,
-          typename EqualKey = int,
+          typename EqualKey = std::equal_to<Key>,
           typename Alloc = std::allocator< std::pair<const Key, Data> > >
-class hash_map : public std::map<Key, Data, HashFcn, Alloc> {
+class hash_map : public std::map<Key, Data, HashFcn, EqualKey, Alloc> {
  public:
-  hash_map(int = 0) {}
+  hash_map(int = 0, const HashFcn& = HashFcn(), const EqualKey& = EqualKey(),
+           const Alloc& = Alloc()) {}
 };
 
 template <typename Key,
           typename HashFcn = hash<Key>,
-          typename EqualKey = int >
+          typename EqualKey = std::equal_to<Key> >
 class hash_set : public std::set<Key, HashFcn> {
  public:
   hash_set(int = 0) {}
@@ -126,19 +127,21 @@ struct hash<const char*>
 
 template <typename Key, typename Data,
           typename HashFcn = hash<Key>,
-          typename EqualKey = int,
+          typename EqualKey = std::equal_to<Key>,
           typename Alloc = std::allocator< std::pair<const Key, Data> > >
-class hash_map : public GOOGLE_PROTOBUF_HASH_NAMESPACE::hash_map<
-    Key, Data, HashFcn, Alloc> {
+class hash_map
+    : public GOOGLE_PROTOBUF_HASH_NAMESPACE::GOOGLE_PROTOBUF_HASH_MAP_CLASS<
+          Key, Data, HashFcn, EqualKey, Alloc> {
  public:
-  hash_map(int = 0) {}
+  hash_map(int = 0, const HashFcn& = HashFcn(), const EqualKey& = EqualKey(),
+           const Alloc& = Alloc()) {}
 };
 
-template <typename Key,
-          typename HashFcn = hash<Key>,
-          typename EqualKey = int >
-class hash_set : public GOOGLE_PROTOBUF_HASH_NAMESPACE::hash_set<
-    Key, HashFcn> {
+template <typename Key, typename HashFcn = hash<Key>,
+          typename EqualKey = std::equal_to<Key> >
+class hash_set
+    : public GOOGLE_PROTOBUF_HASH_NAMESPACE::GOOGLE_PROTOBUF_HASH_SET_CLASS<
+          Key, HashFcn, EqualKey> {
  public:
   hash_set(int = 0) {}
 };
@@ -169,7 +172,8 @@ struct hash<const char*> {
   }
 };
 
-template <typename Key, typename Data, typename HashFcn = hash<Key>,
+template <typename Key, typename Data,
+          typename HashFcn = hash<Key>,
           typename EqualKey = std::equal_to<Key>,
           typename Alloc = std::allocator< std::pair<const Key, Data> > >
 class hash_map

vsprojects/config.h

 /* protobuf config.h for MSVC.  On other platforms, this is generated
  * automatically by autoheader / autoconf / configure. */
 
-/* the location of <hash_map> */
-#define HASH_MAP_H <hash_map>
+#include <google/protobuf/stubs/pbconfig.h>
 
-/* the namespace of hash_map/hash_set */
-// Apparently Microsoft decided to move hash_map *back* to the std namespace
-// in MSVC 2010:
-//   http://blogs.msdn.com/vcblog/archive/2009/05/25/stl-breaking-changes-in-visual-studio-2010-beta-1.aspx
-// TODO(kenton):  Use unordered_map instead, which is available in MSVC 2010.
-#if _MSC_VER < 1310 || _MSC_VER >= 1600
-#define HASH_NAMESPACE std
-#else
-#define HASH_NAMESPACE stdext
-#endif
-
-/* the location of <hash_set> */
-#define HASH_SET_H <hash_set>
+#define HASH_MAP_H GOOGLE_PROTOBUF_HASH_MAP_H
+#define HASH_NAMESPACE GOOGLE_PROTOBUF_HASH_NAMESPACE
+#define HASH_SET_H GOOGLE_PROTOBUF_HASH_SET_H
 
-/* define if the compiler has hash_map */
-#define HAVE_HASH_MAP 1
+#ifdef GOOGLE_PROTOBUF_HAVE_HASH_MAP
+#define HAVE_HASH_MAP GOOGLE_PROTOBUF_HAVE_HASH_MAP
+#endif
 
-/* define if the compiler has hash_set */
-#define HAVE_HASH_SET 1
+#ifdef GOOGLE_PROTOBUF_HAVE_HASH_SET
+#define HAVE_HASH_SET GOOGLE_PROTOBUF_HAVE_HASH_SET
+#endif
 
 /* define if you want to use zlib.  See readme.txt for additional
  * requirements. */

vsprojects/google/protobuf/stubs/pbconfig.h

 /* protobuf config.h for MSVC.  On other platforms, this is generated
  * automatically by autoheader / autoconf / configure. */
 
-/* the location of <hash_map> */
-#define GOOGLE_PROTOBUF_HASH_MAP_H <hash_map>
+// NOTE: if you add new macros in this file manually, please propagate the macro
+// to vsprojects/config.h.
 
 /* the namespace of hash_map/hash_set */
 // Apparently Microsoft decided to move hash_map *back* to the std namespace
 // in MSVC 2010:
 //   http://blogs.msdn.com/vcblog/archive/2009/05/25/stl-breaking-changes-in-visual-studio-2010-beta-1.aspx
-// TODO(kenton):  Use unordered_map instead, which is available in MSVC 2010.
-#if _MSC_VER < 1310 || _MSC_VER >= 1600
+// And.. they are moved back to stdext in MSVC 2013 (haven't checked 2012). That
+// said, use unordered_map for MSVC 2010 and beyond is our safest bet.
+#if _MSC_VER >= 1600
 #define GOOGLE_PROTOBUF_HASH_NAMESPACE std
-#else
+#define GOOGLE_PROTOBUF_HASH_MAP_H <unordered_map>
+#define GOOGLE_PROTOBUF_HASH_MAP_CLASS unordered_map
+#define GOOGLE_PROTOBUF_HASH_SET_H <unordered_set>
+#define GOOGLE_PROTOBUF_HASH_SET_CLASS unordered_set
+#elif _MSC_VER >= 1310
 #define GOOGLE_PROTOBUF_HASH_NAMESPACE stdext
+#define GOOGLE_PROTOBUF_HASH_MAP_H <hash_map>
+#define GOOGLE_PROTOBUF_HASH_MAP_CLASS hash_map
+#define GOOGLE_PROTOBUF_HASH_SET_H <hash_set>
+#define GOOGLE_PROTOBUF_HASH_SET_CLASS hash_set
+#else
+#define GOOGLE_PROTOBUF_HASH_NAMESPACE std
+#define GOOGLE_PROTOBUF_HASH_MAP_H <hash_map>
+#define GOOGLE_PROTOBUF_HASH_MAP_CLASS hash_map
+#define GOOGLE_PROTOBUF_HASH_SET_H <hash_set>
+#define GOOGLE_PROTOBUF_HASH_SET_CLASS hash_set
 #endif
 
 /* the location of <hash_set> */
-#define GOOGLE_PROTOBUF_HASH_SET_H <hash_set>
 
 /* define if the compiler has hash_map */
 #define GOOGLE_PROTOBUF_HAVE_HASH_MAP 1
 
 /* define if the compiler has hash_set */
 #define GOOGLE_PROTOBUF_HAVE_HASH_SET 1
-
-/* define if you want to use zlib.  See readme.txt for additional
- * requirements. */
-// #define HAVE_ZLIB 1