replacing FSTGetTokenResult by C++ Token implementation (#805)

* replacing Auth/FSTUser by C++ auth implementation

* address changes

* replacing FSTGetTokenResult by C++ Token implementation

* address changes

* address changes

* fix another const& v.s. dispatch bug

* fix more const& v.s. dispatch bug  zxu123 committed

* fix

* passing by value in callback

1 files changed, 10 insertions, 1 deletions

diff --git a/Firestore/core/src/firebase/firestore/util/string_apple.h b/Firestore/core/src/firebase/firestore/util/string_apple.h
index fe2a487..3f6b814 100644
--- a/Firestore/core/src/firebase/firestore/util/string_apple.h
+++ b/Firestore/core/src/firebase/firestore/util/string_apple.h
@@ -42,7 +42,16 @@ inline NSString* WrapNSStringNoCopy(const absl::string_view str) {
   return WrapNSStringNoCopy(str.data());
 }
 
-// Creates an absl::string_view wrapper for the contents of the given NSString.
+// Translates a string_view string to the equivalent NSString by making a copy.
+inline NSString* WrapNSString(const absl::string_view str) {
+  return [[NSString alloc]
+      initWithBytes:const_cast<void*>(static_cast<const void*>(str.data()))
+             length:str.length()
+           encoding:NSUTF8StringEncoding];
+}
+
+// Creates an absl::string_view wrapper for the contents of the given
+// NSString.
 inline absl::string_view MakeStringView(NSString* str) {
   return absl::string_view(
       [str UTF8String], [str lengthOfBytesUsingEncoding:NSUTF8StringEncoding]);