20 General utilities library [utilities]

20.8 Function objects [function.objects]

20.8.11 Polymorphic function wrappers [func.wrap] Class bad_function_call [func.wrap.badcall]

An exception of type bad_function_call is thrown by function::operator() ([func.wrap.func.inv]) when the function wrapper object has no target.

namespace std {
  class bad_function_call : public std::exception {
    // [func.wrap.badcall.const], constructor:
    bad_function_call() noexcept;
} // namespace std bad_function_call constructor [func.wrap.badcall.const]

bad_function_call() noexcept;

Effects: constructs a bad_function_call object.