请问一下TimerQueue 构造函数里bind的问题

[clay Leven]

请问一下TimerQueue构造函数里的timerfdChannel_.setReadCallback(td::bind(&TimerQueue::handleRead, this));setReadCallback参数不是一个std::function<void(Timestamp)>嘛，为啥可以bind一个void void的函数啊

[Shuo Chen]

Ref. docs:

1. https://www.boost.org/doc/libs/1_66_0/libs/bind/doc/html/bind.html#bind.purpose.using_bind_with_functions_and_fu

> Any extra arguments are silently ignored, just like the first and the second argument are ignored in the third example.

2. https://en.cppreference.com/w/cpp/utility/functional/bind

> If some of the arguments that are supplied in the call to g() are not matched by any placeholders stored in g, the unused arguments are evaluated and discarded.