dialects of C++

was reading this: http://andrewgarrison.com/blog/porting-an-ios-app-to-windows-8/

the code:

void ReadFile(Platform::String^ fileName)
{
   using namespace Windows::Storage;
   using namespace Concurrency;

   // First get the file...asynchronously
   auto folder = ApplicationData::Current->LocalFolder;
   task getFileTask(folder->GetFileAsync(fileName));

   // Then read the file...asynchronously
   auto readBufferTask = getFileTask.then([] (StorageFile^ f)  {
      return FileIO::ReadBufferAsync(f);
   });

   // Then convert the buffer into something usable, like 
   // a std::vector......asynchronously
   readBufferTask.then([requestId] (Streams::IBuffer^ b) {
      auto a = ref new Platform::Array(b->Length);
      Streams::DataReader::FromBuffer(b)->ReadBytes(a);

      _data.clear();
      for (uint i = 0; i < b->Length; i++)
      {
         _data.push_back((char)a[i]);
      }

      // Now set a flag to indicate that _data vector is ready
      _dataIsReady = true;
   });
}

what dialect is this, and why is the bitwise or operator being use in this way, that is not the way that operator is supposed to be used

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