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/*
* 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 <Foundation/Foundation.h>
NS_ASSUME_NONNULL_BEGIN
/**
* Placeholder values you may write into Firebase Database as a value or
* priority that will automatically be populated by the Firebase Database
* server.
*/
NS_SWIFT_NAME(ServerValue)
@interface FIRServerValue : NSObject
/**
* Placeholder value for the number of milliseconds since the Unix epoch
*/
+ (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 a long or 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
* 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