std::bind出现unresolved overloaded function type的问题？

Question

我有一个Event类：

class  Event
{
public:

int running;
struct Poll *poll;
TimerManager timer_manager;

std::function<bool()> handle_timer;
std::function<bool()> handle_io;

Event();
~Event();

bool wait();

private:

int num;

void  register_handler();
bool  default_handle_timer();
bool  default_handle_io();
};

然后，register_handler方法如下：

void  Event::register_handler()
{
handle_io = std::bind(default_handle_io, this);
handle_timer = std::bind(default_handle_timer, this);
}

编译报错：

error: no matching function for call to 'bind(<unresolved overloaded function type>, Event* const)'
     handle_io = std::bind(default_handle_io, this);

Answer 1

void  Event::register_handler()
{
handle_io = std::bind(&Event::default_handle_io, this);
handle_timer = std::bind(&Event::default_handle_timer, this);
}

Answer 2

https://stackoverflow.com/que...

说的很清楚了。