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, 63 insertions, 0 deletions

diff --git a/Firestore/Source/API/FIRSetOptions.mm b/Firestore/Source/API/FIRSetOptions.mm
new file mode 100644
index 0000000..b41086c
--- /dev/null
+++ b/Firestore/Source/API/FIRSetOptions.mm
@@ -0,0 +1,63 @@
+/*
+ * 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 "Firestore/Source/API/FIRSetOptions+Internal.h"
+
+NS_ASSUME_NONNULL_BEGIN
+
+@implementation FIRSetOptions
+
+- (instancetype)initWithMerge:(BOOL)merge {
+  if (self = [super init]) {
+    _merge = merge;
+  }
+  return self;
+}
+
++ (instancetype)merge {
+  return [[FIRSetOptions alloc] initWithMerge:YES];
+}
+
+- (BOOL)isEqual:(id)other {
+  if (self == other) {
+    return YES;
+  } else if (![other isKindOfClass:[FIRSetOptions class]]) {
+    return NO;
+  }
+
+  FIRSetOptions *otherOptions = (FIRSetOptions *)other;
+  return otherOptions.merge == self.merge;
+}
+
+- (NSUInteger)hash {
+  return self.merge ? 1231 : 1237;
+}
+@end
+
+@implementation FIRSetOptions (Internal)
+
++ (instancetype)overwrite {
+  static FIRSetOptions *overwriteInstance = nil;
+  static dispatch_once_t onceToken;
+  dispatch_once(&onceToken, ^{
+    overwriteInstance = [[FIRSetOptions alloc] initWithMerge:NO];
+  });
+  return overwriteInstance;
+}
+
+@end
+
+NS_ASSUME_NONNULL_END