In VC++ Directories -> Include Directories,I've added
E:\3D Works\Math Tools\eigen-eigen-6e7488e20373
This is the folder where I downloaded and extracted.

And now in my .cpp I've add #include <Eigen\Core>
But then I got a lot of errors like:

1>c:\program files (x86)\microsoft visual studio 8\vc\include\complex(426) : error C2628: '_Ty' followed by 'double' is illegal (did you forget a ';'?)
1> c:\program files (x86)\microsoft visual studio 8\vc\include\complex(530) : see reference to class template instantiation 'std::_Complex_base<_Ty,_Valbase>' being compiled
1>c:\program files (x86)\microsoft visual studio 8\vc\include\complex(426) : error C2059: syntax error : '<L_TYPE_raw>'
1>c:\program files (x86)\microsoft visual studio 8\vc\include\complex(426) : error C2334: unexpected token(s) preceding '{'; skipping apparent function body
1>c:\program files (x86)\microsoft visual studio 8\vc\include\complex(436) : error C2628: '_Ty' followed by 'double' is illegal (did you forget a ';'?)
1>c:\program files (x86)\microsoft visual studio 8\vc\include\complex(436) : error C2059: syntax error : '<L_TYPE_raw>'
......................................

Please help me, thanks.

that's rather strange since the errors appears in the standard complex header... Perhaps you could try two things:

1 - check the c:\program files (x86)\microsoft visual studio 8\vc\include\complex file, especially around lines 426 (you could even paste them here)

2 - try to include <complex> only (without Eigen/Core)

ggael wrote:that's rather strange since the errors appears in the standard complex header... Perhaps you could try two things:

1 - check the c:\program files (x86)\microsoft visual studio 8\vc\include\complex file, especially around lines 426 (you could even paste them here)

2 - try to include <complex> only (without Eigen/Core)

Thanks for your prompt reply, but the problem persists.

I've included neither <complex> nor <complex.h>, I simply don't need them.
I've never messed with <complex>, and its weird why #include <Eigen\Core>
leads to errors in <complex> ?, is there a relationship between them?

Is there an install tutorial for windows/MS visual studio? Thanks.

<Eigen/Core> has to include <complex>. It does that before including MKL's stuff.

ggael wrote:<Eigen/Core> has to include <complex>. It does that before including MKL's stuff.

I found what's wrong.

I've already templated real as double in my vector3.h, and this "real"
is also been used by <complex>, that's why in <complex> line 426
_Ty real(const _Ty& _Right)
it says '_Ty' followed by 'double' is illegal

Now I changed real to _real in my vector3.h and everything works correctly.

Thanks ggael.


P.S I just found Real,scalar,Scalar are all used in Eigen, is there a way to adopt Eigen's Real in my vector3.h?