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#include <Eigen/Geometry>

int main(int argc,char * argv[])
{
  Eigen::Rotation2Dd r;
}


gives a compiler error:

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error: no matching constructor for initialization of 'Eigen::Rotation2Dd'
      (aka 'Rotation2D<double>')
  Eigen::Rotation2Dd r;


Obviously I can fix this with:

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Eigen::Rotation2Dd r(0);


But the lack of a 0-argument constructor makes it tedious to include Rotation2D objects in stl containers or classes. Was there a good reason for not including such a constructor?

No good reason, it's just that its primary purpose is to create 2D rotation matrices from a given angle, and not to be actually stored.

Fixed in default and 3.2 branches.