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| title = C++ Tutorial Part I - Basic: 5.10 Function pointers are mainly used to achieve call back technique, which will be discussed right after.
| author = Silan Liu
| publisher = TRIPOD: Programming Tutorials Copyright © Silan Liu 2002
| quote = Function pointers are mainly used to achieve call back technique, which will be discussed right after.
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}}</ref> However it can be difficult or awkward to pass a state into or out of the callback function. This restriction also inhibits more dynamic behavior of the function. A function object solves those problems since the function is really a [[facade pattern|façade]] for a full object, carrying its own state.
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| title = C++ Tutorial Part I - Basic: 5.10 Function pointers are mainly used to achieve call back technique, which will be discussed right after.
| author = Paweł Turlejski
| date = 2009-10-02
| publisher = Just a Few Lines
| quote = PHP 5.3, along with many other features, introduced closures. So now we can finally do all the cool stuff that Ruby / Groovy / Scala / any_modern_language guys can do, right? Well, we can, but we probably won’t… Here's why.
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}}</ref> [[Functional programming]] languages additionally support [[closure (computer science)|closures]], i.e. first-class functions that can 'close over' variables in their surrounding environment at creation time. During compilation, a transformation known as [[lambda lifting]] converts the closures into function objects.
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