Make ServerValue.increment() public (#5256)

Author: schmidt-sebastian

Example/Database/Tests/Integration/FData.m

@@ -21,7 +21,7 @@
 #import "FEventTester.h"
 #import "FIRDatabaseConfig_Private.h"
 #import "FIRDatabaseQuery_Private.h"
-#import "FIRServerValue_unreleased.h"
+#import "FIRServerValue.h"
 #import "FRepo_Private.h"
 #import "FTestHelpers.h"
 #import "FTupleEventTypeString.h"

Firebase/Database/Api/FIRServerValue.m

@@ -15,7 +15,6 @@
  */
 
 #import "FIRServerValue.h"
-#import "FIRServerValue_unreleased.h"
 
 @implementation FIRServerValue
 

Firebase/Database/Api/FIRServerValue_unreleased.h

@@ -1,4 +1,6 @@
 # Unreleased
+- [feature] Added `ServerValue.increment()` to support atomic field value increments
+  without transactions.
 
 # v6.1.4
 - [changed] Addressed a performance regression introduced in 6.1.3.

Firebase/Database/CHANGELOG.md

@@ -31,6 +31,23 @@ NS_SWIFT_NAME(ServerValue)
  */
 + (NSDictionary *)timestamp;
 
+/**
+ * Returns a placeholder value that can be used to atomically increment the
+ * current database value by the provided delta.
+ *
+ * The delta must be an long or a double value. If the current value is not an
+ * integer or double, or if the data does not yet exist, the transformation will
+ * set the data to the delta value. If either of the delta value or the existing
+ * data are doubles, both values will be interpreted as doubles. Double
+ * arithmetic and representation of double values follow IEEE 754 semantics. If
+ * there is positive/negative integer overflow, the sum is calculated as a  a
+ * double.
+ *
+ * @param delta the amount to modify the current value atomically.
+ * @return a placeholder value for modifying data atomically server-side.
+ */
++ (NSDictionary *)increment:(NSNumber *)delta NS_SWIFT_NAME(increment(_:));
+
 @end
 
 NS_ASSUME_NONNULL_END