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22 General utilities library [utilities]

22.10 Function objects [function.objects]

22.10.17 Polymorphic function wrappers [func.wrap]

22.10.17.3 Class template function [func.wrap.func]

22.10.17.3.4 Capacity [func.wrap.func.cap]

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explicit operator bool() const noexcept;
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Returns: true if *this has a target, otherwise false.