The second is more extensive in that it addresses a real world case study which touches on most of the important aspects of the libary. https://www.youtube.com/watch?v=93Cjg42bGEw .
Finally, for those who still enjoy the written word there is the documentation in which significant effort has been invested. http://htmlpreview.github.io/?https://github.com/robertramey/safe_numerics/master/doc/html/index.html
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+If you use this libary and find it useful, please add a star. I need motivation!!!