How to check the version number of Eigen C++ template library?

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This answer is only a summary from the comments above:

  • At compile-time you have EIGEN_WORLD_VERSION, EIGEN_MAJOR_VERSION
    and EIGEN_MINOR_VERSION, you can easily embed this information in
    your application.

  • 3.1.91 sounds like a beta version of 3.2.

  • The version number macros are defined in Macros.h located at
    \Eigen\src\Core\util\.

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