54 lines
1.7 KiB
Objective-C
54 lines
1.7 KiB
Objective-C
//
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// Copyright 2018 Signal Messenger, LLC
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// SPDX-License-Identifier: AGPL-3.0-only
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//
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#import <SignalCoreKit/NSObject+OWS.h>
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#import <SignalCoreKit/OWSAsserts.h>
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NS_ASSUME_NONNULL_BEGIN
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#pragma mark - Singleton Asserts
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// The "singleton asserts" can be used to ensure
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// that we only create a singleton once.
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//
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// The simplest way to use them is the OWSSingletonAssert() macro.
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// It is intended to be used inside the singleton's initializer.
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//
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// If, however, a singleton has multiple possible initializers,
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// you need to:
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//
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// 1. Use OWSSingletonAssertFlag() outside the class definition.
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// 2. Use OWSSingletonAssertInit() in each initializer.
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#ifdef DEBUG
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#define ENFORCE_SINGLETONS
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#endif
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#ifdef ENFORCE_SINGLETONS
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#define OWSSingletonAssertFlag() static BOOL _isSingletonCreated = NO;
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#define OWSSingletonAssertInit() \
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@synchronized([self class]) { \
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if (!AppContextObjcBridge.CurrentAppContext.isRunningTests) { \
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OWSAssertDebug(!_isSingletonCreated); \
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_isSingletonCreated = YES; \
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} \
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}
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#define OWSSingletonAssert() OWSSingletonAssertFlag() OWSSingletonAssertInit()
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#else
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#define OWSSingletonAssertFlag()
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#define OWSSingletonAssertInit()
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#define OWSSingletonAssert()
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#endif
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NS_ASSUME_NONNULL_END
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