Non-blocking asynchronous servers in c++?

Question

C++ / C#

Hello everyone
Can you tell me a server in C ++ with non-blocking I / O for the socket, so that you do not have to create 1 thread per connection? (preferably supported at the current time :) )
Analogs:

• Java - Netty, Vertx;
  
• Core Node.js
  

Answer 1

will boost::asio work?
https://www.boost.org/doc/libs/1_74_0/doc/html/boo...

Answer 2

Not for C++, but CPC, continuation passing c may be of interest. There, in a synchronous style, you can write code that, through the meat grinder of lambda lifting, will be converted into asynchronous