Abstract: Here I propose C and C++ interfaces and experimental implementation for "Twofold fast arithmetic" I introduced earlier for tracking floating-point inaccuracy. Testing shows, plain C enables high-performance computing with twofolds. C++ interface enables coding as easily as ordinary floating-point numbers. My goal is convincing you to try twofolds; I think assuring accuracy of math computations is worth its cost.
2014 (C) Evgeny Latkin, Free for academic and non-commercial
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Text also uploaded to arXiv, link: http://arxiv.org/abs/1412.5316