Fix Firestore source errors under VS2017 (#1515)

* Project file updates from sync_project.rb

* Fix misc compile errors under VS2017

* Fix util/hashing under VS2017

std::hash<int> is not just a pass through in Microsoft's STL.

* Disable unsafe code warnings in VS2017

... where comparing against a reference implementation that has no easy
safe equivalent.

* Handle drive letters in paths on Windows

1 files changed, 3 insertions, 1 deletions

diff --git a/Firestore/core/src/firebase/firestore/immutable/sorted_map_iterator.h b/Firestore/core/src/firebase/firestore/immutable/sorted_map_iterator.h
index 960e3f6..20c11a7 100644
--- a/Firestore/core/src/firebase/firestore/immutable/sorted_map_iterator.h
+++ b/Firestore/core/src/firebase/firestore/immutable/sorted_map_iterator.h
@@ -119,7 +119,9 @@ class SortedMapIterator {
   pointer get() const {
     switch (tag_) {
       case Tag::Array:
-        return array_iter_;
+        // std::array::iterator is not guaranteed to be a bare pointer but will
+        // be a RandomAccessIterator which does have operator*().
+        return &*array_iter_;
       case Tag::Tree:
         return tree_iter_.get();
     }