RE: [eigen] no matching function for call to 'abs(const float&)'

[Nuno Marques <n.marques21@xxxxxxxxxxx>]

> And if it's not? Eigen cannot control what has been included before or 
> after Eigen headers and I'm guessing your fix would break as soon as 
> someone uses that code without including cmath first.
> Ilja

I'm pretty much sure it is as I made sure i added #include <cmath> so you are not helping at all.

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> Date: Thu, 27 Aug 2015 13:59:32 -0400
> From: ilja.j..honkonen@xxxxxxxx
> To: eigen@xxxxxxxxxxxxxxxxxxx
> Subject: Re: [eigen] no matching function for call to 'abs(const float&)'
>
> > cmath has been included.
> > > > OK, replacing line 44 of Eigen/src/Core/functors/UnaryFunctors..h with:
> > > > EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE const result_type operator()
> > > > (const Scalar& a) const { using std::fabs; return fabs(a); }
> > > Will this work even if cmath hasn't been included at all?
>
> And if it's not? Eigen cannot control what has been included before or
> after Eigen headers and I'm guessing your fix would break as soon as
> someone uses that code without including cmath first.
> Ilja
>
>