static void connect_method(Subject& subject, Foo& foo) { subject.connect(&foo, &Foo::handler); }
static void connect_method(Subject& subject, Foo& foo) { //foo.reg = subject.connect(std::bind(&Foo::handler, &foo, std::placeholders::_1)); foo.reg = subject.connect(&foo, &Foo::handler); }
static void connect_method(Subject& subject, Foo& foo) { foo.reg.emplace_front(subject.connect( std::bind(&Foo::handler, &foo, std::placeholders::_1))); }