[eigen] eigen3 msvc 1900

[Yann Nayn <yann.nayn@xxxxxxxx>]

Hi,

it seems that patching

Core/util/Macros.h line 310 as follows:

#if _MSC_VER >= 1900
    #define EIGEN_INHERIT_ASSIGNMENT_EQUAL_OPERATOR(Derived) \
        using Base::operator =;\
  EIGEN_STRONG_INLINE Derived& operator=(const Derived& other) { Base::operator=(other); return *this; }
#else
    #define EIGEN_INHERIT_ASSIGNMENT_EQUAL_OPERATOR(Derived) \
        using Base::operator =;
#endif 

and Core/MapBase.h line 310 as follows:

Derived& operator=(const MapBase& other)
    {
      return MapBase<Derived, ReadOnlyAccessors>::Base::operator=(other);
    }
   
    using MapBase<Derived, ReadOnlyAccessors>::Base::operator=;
   

lets Eigen3 compile smoothly using msvc 1900 22310.1

Yann