About: Automatic Reference Counting

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Automatic Reference Counting (ARC) is a memory management feature of the Clang compiler providing automatic reference counting for the Objective-C and Swift programming languages. At compile time, it inserts into the object code messages retain and release which increase and decrease the reference count at run time, marking for deallocation those objects when the number of references to them reaches zero.

Attributes	Values
rdf:type	software
rdfs:label	Automatic Reference Counting (en)
rdfs:comment	Automatic Reference Counting (ARC) is a memory management feature of the Clang compiler providing automatic reference counting for the Objective-C and Swift programming languages. At compile time, it inserts into the object code messages retain and release which increase and decrease the reference count at run time, marking for deallocation those objects when the number of references to them reaches zero. (en)
sameAs	Automatic Reference Counting
dbp:wikiPageUsesTemplate	dbt:About dbt:R dbt:Reflist
Subject	Memory management Objective-C
Link from a Wikipage to an external page	https://github.com/plausiblelabs/PLWeakCompatibility https://developer.apple.com/library/content/documentation/Swift/Conceptual/Swift_Programming_Language/AutomaticReferenceCounting.html https://developer.apple.com/library/ios/%23releasenotes/ObjectiveC/RN-TransitioningToARC/Introduction/Introduction.html
gold:hypernym	Enhancement
prov:wasDerivedFrom	http://en.wikipedia.org/wiki/Automatic_Reference_Counting?oldid=1063164601&ns=0
Wikipage page ID	36246458 (xsd:integer)
page length (characters) of wiki page	13717 (xsd:nonNegativeInteger)
Wikipage revision ID	1063164601 (xsd:integer)
Link from a Wikipage to another Wikipage	OS X Lion OS X Mountain Lion Programming language Smart pointer Xcode Apple Inc. Memory management Objective-C Object-oriented programming Object (computer science) Object code Objective-C Swift (programming language) Clang Dangling pointer Deadlock Runtime library Closure (computer programming) Compiler Conditional (computer programming) Garbage collection (computer science) List of iOS games IOS 4 IOS 5 Value type and reference type Weak reference Memory leak Memory management MacOS MacOS Sierra Mac OS X Snow Leopard Reference counting dbr:NSAutoreleasePool_alloc%5D_init%5D; dbr:NSNotificationCenter_defaultCenter%5D_removeObserver:self%5D;
has abstract	Automatic Reference Counting (ARC) is a memory management feature of the Clang compiler providing automatic reference counting for the Objective-C and Swift programming languages. At compile time, it inserts into the object code messages retain and release which increase and decrease the reference count at run time, marking for deallocation those objects when the number of references to them reaches zero. ARC differs from tracing garbage collection in that there is no background process that deallocates the objects asynchronously at runtime. Unlike tracing garbage collection, ARC does not handle reference cycles automatically. This means that as long as there are "strong" references to an object, it will not be deallocated. Strong cross-references can accordingly create deadlocks and memory leaks. It is up to the developer to break cycles by using weak references. Apple Inc. deploys ARC in their operating systems, such as macOS (OS X) and iOS. Limited support (ARCLite) has been available since Mac OS X Snow Leopard and iOS 4, with complete support following in Mac OS X Lion and iOS 5. Garbage collection was declared deprecated in OS X Mountain Lion, in favor of ARC, and removed from the Objective-C runtime library in macOS Sierra. (en)
foaf:isPrimaryTopicOf	http://en.wikipedia.org/wiki/Automatic_Reference_Counting
is Link from a Wikipage to another Wikipage of	ARC Object resurrection Objective-C List of programming languages by type Cocoa (API) Darwin (operating system) Finalizer Garbage collection (computer science) Manual memory management MacOS Sierra
is foaf:primaryTopic of	http://en.wikipedia.org/wiki/Automatic_Reference_Counting

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