This mini-project consists of some examples I wrote for a 30 minutes mini-lecture about modern async C++. In order to put the modern code in perspective, I implemented the same algorithm three times. First, "traditional.cpp" using blocking IO. Then, in "async.cpp" I show how most people would implement it today, using scattered methods and callbacks. And last in "modern.cpp", I show how elegantly it can be done with recent versions of boost::asio, using coroutines in stead of callbacks. The code is async, but it looks just as simple as traditional blocking code. As an extra bonus, the stack is intact, so if your program crash, you will have much more accurate information than in the async case. The code is very simple; it resolves a host-name, loops over the received IP numbers until it connects (or fails to connect to any of them). When connected, it sends a minimalistic HTTP request to the address, and prints the server-response directly to the standard output. The code is compiled with clang 3.5 and g++ 4.9.1 I put this code in the public domain. Jarle (jgaa) Aase, December 2014.
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