[Boost-users] [signals2] Connect to overloaded slots

Subject: [Boost-users] [signals2] Connect to overloaded slots
From: Florian Lindner (mailinglists_at_[hidden])
Date: 2017-11-10 12:54:34

Hello,

this code compiles just fine:

#include <boost/signals2.hpp>
#include <iostream>

// void slot() { std::cout << "No args slot called." << std::endl; }
void slot(int i) { std::cout << "Int " << i << " arg slot called." << std::endl; }

int main(int argc, char **argv)
{
  boost::signals2::signal<void(int)> s;
  s.connect(&slot);

  return 0;
}

However, when I uncomment the slot() function, it does not do so, anymore:

boostsignals.cpp:78:5: error: no matching member function for call to 'connect'
  s.connect(&slot);
  ~~^~~~~~~
/usr/include/boost/signals2/detail/signal_template.hpp:689:18: note: candidate function not viable: no overload of
'slot' matching 'const boost::signals2::signal<void (int), boost::signals2::optional_last_value<void>, int,
      std::less<int>, boost::function<void (int)>, boost::function<void (const boost::signals2::connection &, int)>,
boost::signals2::mutex>::slot_type' (aka 'const slot<void (int), boost::function<void (int)> >') for 1st argument
      connection connect(const slot_type &slot, connect_position position = at_back)
                 ^
/usr/include/boost/signals2/detail/signal_template.hpp:693:18: note: candidate function not viable: requires at least 2
arguments, but 1 was provided
      connection connect(const group_type &group,
                 ^

Is there a way to make it working with overloaded slot functions?

Thanks,
Florian