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d00ed249e5
* Introduce ASIntegerMap, improve our changeset handling Rename to ASIntegerMap License header * Add unit tests for ASIntegerMap * Address nit
71 lines
1.8 KiB
Objective-C
71 lines
1.8 KiB
Objective-C
//
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// ASIntegerMap.h
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// Texture
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//
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// Copyright (c) 2017-present, Pinterest, Inc. All rights reserved.
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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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#import <Foundation/Foundation.h>
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#import <AsyncDisplayKit/ASBaseDefines.h>
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NS_ASSUME_NONNULL_BEGIN
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/**
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* An objective-C wrapper for unordered_map.
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*/
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AS_SUBCLASSING_RESTRICTED
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@interface ASIntegerMap : NSObject <NSCopying>
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/**
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* Creates a map based on the specified update to an array.
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*
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* If oldCount is 0, returns the empty map.
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* If deleted and inserted are empty, returns the identity map.
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*/
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+ (ASIntegerMap *)mapForUpdateWithOldCount:(NSInteger)oldCount
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deleted:(nullable NSIndexSet *)deleted
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inserted:(nullable NSIndexSet *)inserted;
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/**
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* A singleton that maps each integer to itself. Its inverse is itself.
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*
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* Note: You cannot mutate this.
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*/
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@property (class, atomic, readonly) ASIntegerMap *identityMap;
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/**
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* A singleton that returns NSNotFound for all keys. Its inverse is itself.
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*
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* Note: You cannot mutate this.
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*/
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@property (class, atomic, readonly) ASIntegerMap *emptyMap;
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/**
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* Retrieves the integer for a given key, or NSNotFound if the key is not found.
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*
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* @param key A key to lookup the value for.
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*/
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- (NSInteger)integerForKey:(NSInteger)key;
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/**
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* Sets the value for a given key.
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*
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* @param value The new value.
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* @param key The key to store the value for.
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*/
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- (void)setInteger:(NSInteger)value forKey:(NSInteger)key;
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/**
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* Create and return a map with the inverse mapping.
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*/
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- (ASIntegerMap *)inverseMap;
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@end
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NS_ASSUME_NONNULL_END
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