Pointer to function problem

[Pierre Barbier de Reuille]

Hello,

I have a problem with g++ 4.1
I use pointer to functions and I get this error :

src/wrappers/export_vertex.cpp|122| error: no matches converting
function 'cross' to type 'real_t (*)(const class TOOLS::Vector2&, const
class TOOLS::Vector2&)'

/home/barbier/prog/labo/AMAPmod/src/Tools/util_vector.h|232| error:
candidates are: real_t TOOLS::cross(const TOOLS::Vector2&, const
TOOLS::Vector2&)

/home/barbier/prog/labo/AMAPmod/src/Tools/util_vector.h|510| error:
            TOOLS::Vector3 TOOLS::cross(const TOOLS::Vector3&, const
TOOLS::Vector3&)


Here is the line with the error:

real_t ( *cv2cv2_cross )( TOOLS::Vector2 const&, TOOLS::Vector2 const& )
= TOOLS::cross;

I tried to use a typedef like that :

typedef real_t ( *r_cv2cv2 )( const Vector2&, const Vector2& );
r_cv2cv2 cv2cv2_cross = cross;

But the problem is exactly the same.

I really don't understand it ! Also, I tried to reproduce the error with
a simple program but I don't seem to be able to :(

Thank you,

Pierre