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Many computer languages require garbage collection, either as part of the language specification ( e. g., Java, C #, and most scripting languages ) or effectively for practical implementation ( e. g., formal languages like lambda calculus ); these are said to be garbage collected languages.
Other languages were designed for use with manual memory management, but have garbage collected implementations available ( e. g., C, C ++).
Some languages, like Ada, Modula-3, and C ++/ CLI allow both garbage collection and manual memory management to co-exist in the same application by using separate heaps for collected and manually managed objects ; others, like D, are garbage collected but allow the user to manually delete objects and also entirely disable garbage collection when speed is required.
While integrating garbage collection into the language's compiler and runtime system enables a much wider choice of methods, post hoc GC systems exist, including some that do not require recompilation.
( Post-hoc GC is sometimes distinguished as litter collection.
) The garbage collector will almost always be closely integrated with the memory allocator.

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