I read ( en.cppreference.com/w/cpp/language/ ) that standard functions are not addressable except some limited number of functions. Otherwise the behavior either undefined or unspecified.
 
May the function std::invoke be used as shown below?
 
std::for_each( std::begin( v ), std::end( v ), std::invoke<std::function<void()> &> );
With best regards,
(Vlad from Moscow)
 
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