20 General utilities library [utilities]

20.14 Function objects [function.objects]

20.14.17 Polymorphic function wrappers [func.wrap]

20.14.17.3 Class template function [func.wrap.func]

20.14.17.3.8 Specialized algorithms [func.wrap.func.alg]

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template<class R, class... ArgTypes> void swap(function<R(ArgTypes...)>& f1, function<R(ArgTypes...)>& f2) noexcept;
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Effects: As if by: f1.swap(f2);