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77e2d28919
* Create transfer-array method and use it * License headers * Update ASArrayByFlatMapping
43 lines
1.3 KiB
Objective-C
43 lines
1.3 KiB
Objective-C
//
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// ASCollections.h
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// Texture
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//
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// Copyright (c) 2018-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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NS_ASSUME_NONNULL_BEGIN
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@interface NSArray<__covariant ObjectType> (ASCollections)
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/**
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* Create an immutable NSArray from a C-array of strong pointers.
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*
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* Note: The memory for the array you pass in will be zero'd (to prevent ARC from releasing
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* the references when the array goes out of scope.)
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*
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* Can be combined with vector like:
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* vector<NSString *> vec;
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* vec.push_back(@"foo");
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* vec.push_back(@"bar");
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* NSArray *arr = [NSArray arrayTransferring:vec.data() count:vec.size()]
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* ** vec is now { nil, nil } **
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*
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* Unfortunately making a convenience method to do this is currently impossible because
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* vector<NSString *> can't be converted to vector<id> by the compiler (silly).
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*
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* See the private __CFArrayCreateTransfer function.
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*/
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+ (NSArray<ObjectType> *)arrayByTransferring:(ObjectType _Nonnull __strong * _Nonnull)pointers
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count:(NSUInteger)count NS_RETURNS_RETAINED;
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@end
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NS_ASSUME_NONNULL_END
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