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Showing content from https://timsong-cpp.github.io/cppwp/n4659/func.wrap.func.targ below:

[func.wrap.func.targ]

23 General utilities library [utilities] 23.14 Function objects [function.objects] 23.14.13 Polymorphic function wrappers [func.wrap] 23.14.13.2 Class template function [func.wrap.func] 23.14.13.2.5 function target access [func.wrap.func.targ]

const type_info& target_type() const noexcept;

1 #

Returns: If *this has a target of type T, typeid(T); otherwise, typeid(void).

template<class T> T* target() noexcept; template<class T> const T* target() const noexcept;

2 #

Returns: If target_­type() == typeid(T) a pointer to the stored function target; otherwise a null pointer.


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