bind member function to a function object

Question

I'm trying to set signal handler for some signals:

std::function<void(int)> signalHandlerCallback;

MyApp app;
signalHandlerCallback = std::bind(std::mem_fn(&MyApp::SignalHandler, &app, std::placeholders::_1)); // *

// ...
class MyApp
{
public:
    void SignalHandler(int signum);
};

and compiler produces the following error (at line *):

test.cpp:53:111: error: no matching function for call to 'mem_fn(void (MyApp::*)(int), MyApp*, const std::_Placeholder<1>&)'

The same error appears if I don't specify the placeholder.

So how can I bind member function to a std::function in this case?

Thanks in advance.

Answer 1

You don't need std::mem_fn . Just rewrite it this way:

signalHandlerCallback = std::bind(&MyApp::SignalHandler, &app, std::placeholders::_1);