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Re:John Carmack: “I just dumped the C++ server I wrote for a... by mwcampbell on Tuesday March 17, 2015 @09:46PM (#9223066)
What would you consider "modern tooling" for writing a network server in C++? Boost Asio, perhaps?
Re:John Carmack: “I just dumped the C++ server I wrote for a... by a8da6b0c91d on Tuesday March 17, 2015 @09:56PM (#9223108)
Asio is good but can frustrate people unaccustomed to the heavily templated boost approach. High learning barrier. cpp-netlib aims to wrap and simplify Asio for people doing the typical stuff, but I've no experience. POCO, Qt, and libevent are all good approaches.

Having followed Carmack a bit over the years my guess is he built something from scratch himself in C++.