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#include <functional>
 
class event_manager
{
public:
    template <typename... T>
    static void register_event(const unsigned long , std::function<void(T...)> )
    {
    }
};
 
int main()
{
    event_manager::register_event<unsigned int>(12, [](unsigned int ) {});
}
 

prog.cpp: In function ‘int main()’:
prog.cpp:14:73: error: no matching function for call to ‘event_manager::register_event(int, main()::__lambda0)’
     event_manager::register_event<unsigned int>(12, [](unsigned int ) {});
                                                                         ^
prog.cpp:14:73: note: candidate is:
prog.cpp:7:17: note: template<class ... T> static void event_manager::register_event(long unsigned int, std::function<void(T ...)>)
     static void register_event(const unsigned long , std::function<void(T...)> )
                 ^
prog.cpp:7:17: note:   template argument deduction/substitution failed:
prog.cpp:14:73: note:   ‘main()::__lambda0’ is not derived from ‘std::function<void(T ...)>’
     event_manager::register_event<unsigned int>(12, [](unsigned int ) {});
                                                                         ^

Standard output is empty