std::bad_function_call - Exception class thrown when class template function's operator() is called with

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                                                    libstdc++                       std::bad_function_call(3cxx)

       Exception class thrown when class template function's operator() is called with an empty target.

constchar*std::bad_function_call::what()const[virtual],[noexcept]
       Returns a C-style character string describing the general cause of the current error.

       Reimplemented from std::exception.

       std::bad_function_call - Exception class thrown when class template function's operator() is called with
       an empty target.

       #include <functional>

       Inherits std::exception.

   PublicMemberFunctions
       const char * what () const noexcept