Hi Gavin:

 

>Having said this, using lambdas can get tricky in real-world code, as 
>it's common to want to start the same read operation when the first 
>completes, and so on.

 

Just like you said, will the code build a lambda expression when async_read() invoked ?

So that "[=](const error_code& ec, size_t count"  will be built servial times, it is kind of lavish for contructing the lambda expression, isn't ?

It's better that build a function object in static. What do you think ?

 

Cheers~