Functor -> reference to non-static member function must be called

Question

I have a class whose member function I am trying to point to, problem is I keep getting this error reference to non-static member function must be called which from my understanding is that a member function needs to be pointed to. The problem is, when I try to use this solution, the compiler complains because there is no viable conversion from 'void (Foo::*) (const List&) to std::function<void (const List &)>

This is my Foo class:

class Foo {
public:
  int Run( int port);
  void HandleRequest(HTTPServerRequest* request);

private:
    int num_ports;
    void callback_method(const List& );

};  //class Foo

void Foo::HandleRequest(HTTPServerRequest* request){
std::function<void (const List&)> functor = callback_method;
}

score 4 · Accepted Answer · edited Feb 15 '17 at 01:10

4

you can do like this:

void Foo::HandleRequest(HTTPServerRequest* request){
    std::function<void (const List&)> functor =
        std::bind(&Foo::callback_method, this, std::placeholders::_1);
}

or:

void Foo::HandleRequest(HTTPServerRequest* request){
    std::function<void (const List&)> functor = 
        [this](const List& list){callback_method(list);};
}

edited Feb 15 '17 at 01:10

A.S.H

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5
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answered Feb 15 '17 at 00:57

于明亮

62
3

thank you! works like a charm. I used the first option. Can you please explain it to me? – i_use_the_internet Feb 15 '17 at 16:46
you can see this:[link](http://en.cppreference.com/w/cpp/utility/functional/bind) – 于明亮 Feb 17 '17 at 05:41

Functor -> reference to non-static member function must be called

1 Answers1