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      1 #include <iostream>
      2 #include <Eigen/Core>
      3 using namespace Eigen;
      4 
      5 template <typename Derived>
      6 void print_size(const EigenBase<Derived>& b)
      7 {
      8   std::cout << "size (rows, cols): " << b.size() << " (" << b.rows()
      9             << ", " << b.cols() << ")" << std::endl;
     10 }
     11 
     12 int main()
     13 {
     14     Vector3f v;
     15     print_size(v);
     16     // v.asDiagonal() returns a 3x3 diagonal matrix pseudo-expression
     17     print_size(v.asDiagonal());
     18 }
     19