Use std::abs() and std::fabs() instead of abs() and fabs() #189
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STL's std::abs and std::fabs are not defined in the math header provided by C but are accessible through either <cmath> or <cstdlib>. Change the math header to <cmath> so that builds do not fail on macOS.
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I'm not sure where the current
abs()andfabs()functions originated from, but I replaced them withstd::abs()andstd::fabs()