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]

22.10.17.3.6 Target access [func.wrap.func.targ]

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const type_info& target_type() const noexcept;
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#
Returns: If *this has a target of type T, typeid(T); otherwise, typeid(void).
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template<class T> T* target() noexcept; template<class T> const T* target() const noexcept;
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Returns: If target_type() == typeid(T) a pointer to the stored function target; otherwise a null pointer.

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