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git-subtree-dir: submodules/AsyncDisplayKit git-subtree-mainline: d06f423e0ed3df1fed9bd10d79ee312a9179b632 git-subtree-split: 02bedc12816e251ad71777f9d2578329b6d2bef6
41 lines
1.2 KiB
Objective-C
41 lines
1.2 KiB
Objective-C
//
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// ASHashing.h
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// Texture
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//
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// Copyright (c) Pinterest, Inc. All rights reserved.
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// Licensed under Apache 2.0: 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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* When std::hash is unavailable, this function will hash a bucket o' bits real fast.
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* The hashing algorithm is copied from CoreFoundation's private function CFHashBytes.
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* https://opensource.apple.com/source/CF/CF-1153.18/CFUtilities.c.auto.html
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*
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* Simple example:
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* CGRect myRect = { ... };
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* ASHashBytes(&myRect, sizeof(myRect));
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*
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* Example:
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* struct {
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* NSUInteger imageHash;
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* CGSize size;
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* } data = {
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* _image.hash,
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* _bounds.size
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* };
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* return ASHashBytes(&data, sizeof(data));
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*
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* @warning: If a struct has padding, any fields that are intiailized in {}
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* will have garbage data for their padding, which will break this hash! Either
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* use `pragma clang diagnostic warning "-Wpadded"` around your struct definition
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* or manually initialize the fields of your struct (`myStruct.x = 7;` etc).
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*/
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AS_EXTERN NSUInteger ASHashBytes(void *bytes, size_t length);
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NS_ASSUME_NONNULL_END
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