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54 lines
1.8 KiB
54 lines
1.8 KiB
4 years ago
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/*
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* Copyright 2017 Google
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#import <Foundation/Foundation.h>
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NS_ASSUME_NONNULL_BEGIN
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/**
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* Placeholder values you may write into Firebase Database as a value or
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* priority that will automatically be populated by the Firebase Database
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* server.
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*/
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NS_SWIFT_NAME(ServerValue)
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@interface FIRServerValue : NSObject
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/**
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* Placeholder value for the number of milliseconds since the Unix epoch
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*/
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+ (NSDictionary *)timestamp;
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/**
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* Returns a placeholder value that can be used to atomically increment the
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* current database value by the provided delta.
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*
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* The delta must be a long or double value. If the current value is not an
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* integer or double, or if the data does not yet exist, the transformation will
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* set the data to the delta value. If either of the delta value or the existing
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* data are doubles, both values will be interpreted as doubles. Double
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* arithmetic and representation of double values follow IEEE 754 semantics. If
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* there is positive/negative integer overflow, the sum is calculated as a
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* double.
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*
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* @param delta the amount to modify the current value atomically.
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* @return a placeholder value for modifying data atomically server-side.
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*/
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+ (NSDictionary *)increment:(NSNumber *)delta NS_SWIFT_NAME(increment(_:));
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@end
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NS_ASSUME_NONNULL_END
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