New C++ papers available
http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/2018-02-pre-Jacksonville.htm …
What'll make it to C+20? 
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That's why you should use unsigned integers when you need wrap around overflow behavior. Is the better performance worth the complications? Idk.. depends on what you are doing. But I have seen 10-20% improvements in performance critical code just from changing uint to int.
To be fair, you get the same performance improvement from changing a uint smaller than the machine regs to the machine reg size in the right spots. But then your C code isn't as portable anymore and usually you don't find the right spots without reading the compilers asm output.
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Performance isn’t a static value which never changes. Here we have to ask: is the better performance a fundamental property of particular hardware and semantics? Can we reach parity, and if not why? The answer in this context is quite complex.
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