std::bad_function_call (3) Linux Manual Page

std::bad_function_call – std::bad_function_call

Synopsis

Defined in header <functional>
class bad_function_call; (since C++11)
std::bad_function_call is the type of the exception thrown by std::function::operator() if the function wrapper has no target.
 std-bad function call-inheritance.svg
Inheritance diagram

Member functions

              constructs the bad_function_call object
constructor (public member function)

 std::bad_function_call::bad_function_call()

bad_function_call() noexcept;

Constructs a new instance of std::bad_function_call.

Parameters

(none)

Inherited from std::exception

Member functions

destructor destroys the exception object
             (virtual public member function of std::exception)
[virtual]

what returns an explanatory string
             (virtual public member function of std::exception)
[virtual]

Example

// Run this code

#include <iostream>

#include <functional>
int main()

{
    std::function<int()> f = nullptr;
    try {
        f();
    } catch (const std::bad_function_call &e) {
        std::cout << e.what() << '\n';
    }
}

Possible output:

  bad function call

See also

function wraps callable object of any type with specified function call signature
         (class template)
(C++11)