Re: [eigen] Visual C++ 2005 - error c2783 can't deduce template argument for type T |

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*To*: eigen@xxxxxxxxxxxxxxxxxxx*Subject*: Re: [eigen] Visual C++ 2005 - error c2783 can't deduce template argument for type T*From*: Benoît Jacob <jacob@xxxxxxxxxxxxxxx>*Date*: Fri, 31 Oct 2008 18:33:31 +0100

Oooh I see... you're talking about Eigen 1 !! Just FYI Eigen 2 is in beta right now, and for a long time now all effort has been focused on it. Eigen 2 supports Visual C++. I don't remember exactly what was the status of Eigen 1 support with Visual C++, so this issue might not be the only one. Maybe you might want to switch to Eigen 2 anyway? It has many advantages over Eigen 1, including full Visual C++ support, although I don't know how well Visual C++ performs (the quality of the C++ compiler matters a lot for Eigen 2). Cheers, Benoit On Friday 31 October 2008 17:45:22 Mark B wrote: > Vector3d test; > test.isZero(); > > That should reproduce the problem in Visual C++ 2005 Express Edition. > Here is the error: > > 1>h:\collision\eigen\vectorbase.h(579) : error C2783: 'T > Eigen::Util::epsilon(void)' : could not deduce template argument for > 'T' > 1> h:\collision\eigen\util.h(79) : see declaration of > 'Eigen::Util::epsilon' > 1> h:\collision\eigen\vectorbase.h(609) : while compiling class > template member function 'bool > Eigen::VectorBase<T,Derived>::isZero(const T &) const' > 1> with > 1> [ > 1> T=double, > 1> Derived=Eigen::Vector<double,3> > 1> ] > 1> h:\collision\eigen\vector.h(99) : see reference to class > template instantiation 'Eigen::VectorBase<T,Derived>' being compiled > 1> with > 1> [ > 1> T=double, > 1> Derived=Eigen::Vector<double,3> > 1> ] > 1> h:\collision\collmodel.h(9) : see reference to class > template instantiation 'Eigen::Vector<T,Size>' being compiled > 1> with > 1> [ > 1> T=double, > 1> Size=3 > 1> ] > > On Fri, Oct 31, 2008 at 4:38 AM, Benoît Jacob <jacob@xxxxxxxxxxxxxxx> wrote: > > Hi, > > > > Could you paste the exact source code causing this error and compiler > > output? > > > > By the way, Vector3d is a typedef for Matrix<double, 3, 1>. There is no > > separate Vector class template, vectors are a special case of matrices. > > > > Cheers, > > Benoit > > > > On Friday 31 October 2008 07:25:39 Mark B wrote: > >> Hi. When trying to call some_vector.isZero() (when the type of > >> some_vector is Vector3d, which I would imagine is Vector<double, 3>) I > >> get the error c2783 can't deduce template argument for type T. Any > >> idea why? Should be an easy thing to deduce (the error output even > >> says for class 'vector<double, 3>' so obviously it knows the type > >> should be double :P) Thanks, > >> > >> Mark > >> > >> --- > > --- ---

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