Move all Firestore Objective-C to Objective-C++ (#734)

* Move all Firestore files to Objective-C++
* Update project file references
* Don't use module imports from Objective-C++
* Use extern "C" for C-accessible globals
* Work around more stringent type checking in Objective-C++
  * NSMutableDictionary ivars aren't implicitly casted to NSDictionary
  * FSTMaybeDocument callback can't be passed a function that accepts
    FSTDocument
  * NSComparisonResult can't be multiplied by -1 without casting
* Add a #include <inttypes.h> where needed
* Avoid using C++ keywords as variables
* Remove #if __cplusplus guards

1 files changed, 70 insertions, 0 deletions

diff --git a/Firestore/Source/API/FIRSnapshotMetadata.mm b/Firestore/Source/API/FIRSnapshotMetadata.mm
new file mode 100644
index 0000000..27747ce
--- /dev/null
+++ b/Firestore/Source/API/FIRSnapshotMetadata.mm
@@ -0,0 +1,70 @@
+/*
+ * Copyright 2017 Google
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#import "FIRSnapshotMetadata.h"
+
+#import "Firestore/Source/API/FIRSnapshotMetadata+Internal.h"
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface FIRSnapshotMetadata ()
+
+- (instancetype)initWithPendingWrites:(BOOL)pendingWrites fromCache:(BOOL)fromCache;
+
+@end
+
+@implementation FIRSnapshotMetadata (Internal)
+
++ (instancetype)snapshotMetadataWithPendingWrites:(BOOL)pendingWrites fromCache:(BOOL)fromCache {
+  return [[FIRSnapshotMetadata alloc] initWithPendingWrites:pendingWrites fromCache:fromCache];
+}
+
+@end
+
+@implementation FIRSnapshotMetadata
+
+- (instancetype)initWithPendingWrites:(BOOL)pendingWrites fromCache:(BOOL)fromCache {
+  if (self = [super init]) {
+    _pendingWrites = pendingWrites;
+    _fromCache = fromCache;
+  }
+  return self;
+}
+
+// NSObject Methods
+- (BOOL)isEqual:(nullable id)other {
+  if (other == self) return YES;
+  if (![[other class] isEqual:[self class]]) return NO;
+
+  return [self isEqualToMetadata:other];
+}
+
+- (BOOL)isEqualToMetadata:(nullable FIRSnapshotMetadata *)metadata {
+  if (self == metadata) return YES;
+  if (metadata == nil) return NO;
+
+  return self.pendingWrites == metadata.pendingWrites && self.fromCache == metadata.fromCache;
+}
+
+- (NSUInteger)hash {
+  NSUInteger hash = self.pendingWrites ? 1 : 0;
+  hash = hash * 31u + (self.fromCache ? 1 : 0);
+  return hash;
+}
+
+@end
+
+NS_ASSUME_NONNULL_END