[DBus] Explicitly instantiate dbusProperty variant

dbus/property.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef DBUS_PROPERTY_H_
 #define DBUS_PROPERTY_H_
 
 #include <map>
 #include <string>
 
@@ skipping 390 matching lines @@
  private:
   // Current cached value of the property.
   T value_;
 
   // Replacement value of the property.
   T set_value_;
 };
 
 template <> Property<uint8>::Property();
 template <> bool Property<uint8>::PopValueFromReader(MessageReader* reader);
 template <> void Property<uint8>::AppendSetValueToWriter(MessageWriter* writer);

[Nico, 2014/07/23 15:31:00]

Explicitly instantiating a template class instantiates all its methods, so you
can remove all the method instantiations from this file now, I think

[tzik, 2014/07/23 15:39:42]

I think this is a specialization rather than an instantiation.
Removing them causes compile error like this:
../../dbus/property.cc:220:18: error: explicit specialization of 'Property'
after instantiation

[Nico, 2014/07/23 15:41:26]

Ah, right.

+extern template class CHROME_DBUS_EXPORT Property<uint8>;
 
 template <> Property<bool>::Property();
 template <> bool Property<bool>::PopValueFromReader(MessageReader* reader);
 template <> void Property<bool>::AppendSetValueToWriter(MessageWriter* writer);
+extern template class CHROME_DBUS_EXPORT Property<bool>;
 
 template <> Property<int16>::Property();
 template <> bool Property<int16>::PopValueFromReader(MessageReader* reader);
 template <> void Property<int16>::AppendSetValueToWriter(MessageWriter* writer);
+extern template class CHROME_DBUS_EXPORT Property<int16>;
 
 template <> Property<uint16>::Property();
 template <> bool Property<uint16>::PopValueFromReader(MessageReader* reader);
 template <> void Property<uint16>::AppendSetValueToWriter(
   MessageWriter* writer);
+extern template class CHROME_DBUS_EXPORT Property<uint16>;
 
 template <> Property<int32>::Property();
 template <> bool Property<int32>::PopValueFromReader(MessageReader* reader);
 template <> void Property<int32>::AppendSetValueToWriter(MessageWriter* writer);
+extern template class CHROME_DBUS_EXPORT Property<int32>;
 
 template <> Property<uint32>::Property();
 template <> bool Property<uint32>::PopValueFromReader(MessageReader* reader);
 template <> void Property<uint32>::AppendSetValueToWriter(
   MessageWriter* writer);
+extern template class CHROME_DBUS_EXPORT Property<uint32>;
 
 template <> Property<int64>::Property();
 template <> bool Property<int64>::PopValueFromReader(MessageReader* reader);
 template <> void Property<int64>::AppendSetValueToWriter(MessageWriter* writer);
+extern template class CHROME_DBUS_EXPORT Property<int64>;
 
 template <> Property<uint64>::Property();
 template <> bool Property<uint64>::PopValueFromReader(MessageReader* reader);
 template <> void Property<uint64>::AppendSetValueToWriter(
   MessageWriter* writer);
+extern template class CHROME_DBUS_EXPORT Property<uint64>;
 
 template <> Property<double>::Property();
 template <> bool Property<double>::PopValueFromReader(MessageReader* reader);
 template <> void Property<double>::AppendSetValueToWriter(
   MessageWriter* writer);
+extern template class CHROME_DBUS_EXPORT Property<double>;
 
 template <> bool Property<std::string>::PopValueFromReader(
   MessageReader* reader);
 template <> void Property<std::string>::AppendSetValueToWriter(
   MessageWriter* writer);
+extern template class CHROME_DBUS_EXPORT Property<std::string>;
 
 template <> bool Property<ObjectPath>::PopValueFromReader(
   MessageReader* reader);
 template <> void Property<ObjectPath>::AppendSetValueToWriter(
   MessageWriter* writer);
+extern template class CHROME_DBUS_EXPORT Property<ObjectPath>;
 
 template <> bool Property<std::vector<std::string> >::PopValueFromReader(
   MessageReader* reader);
 template <> void Property<std::vector<std::string> >::AppendSetValueToWriter(
   MessageWriter* writer);
+extern template class CHROME_DBUS_EXPORT Property<std::vector<std::string> >;
 
 template <> bool Property<std::vector<ObjectPath> >::PopValueFromReader(
   MessageReader* reader);
 template <> void Property<std::vector<ObjectPath> >::AppendSetValueToWriter(
   MessageWriter* writer);
+extern template class CHROME_DBUS_EXPORT Property<std::vector<ObjectPath> >;
 
 template <> bool Property<std::vector<uint8> >::PopValueFromReader(
   MessageReader* reader);
 template <> void Property<std::vector<uint8> >::AppendSetValueToWriter(
   MessageWriter* writer);
+extern template class CHROME_DBUS_EXPORT Property<std::vector<uint8> >;
 
 }  // namespace dbus
 
 #endif  // DBUS_PROPERTY_H_