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

问题

I added several different versions of Eigen to default including directory of Visual C++. But I got collapse problem when using LDLT (Cholesky decomposition) for some of the testing numerical examples.

So I want to determine which version is actually active when debugging the code.

Is there any function which can indicate the current active Eigen version number?

回答1:

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\.

回答2:

In order to check the version number of Eigen C++ template library, just type

dpkg -p libeigen3-dev

in the terminal. Or just type

pkg-config --modversion eigen3

you will get the Eigen version.

回答3:

Although it is not the goal of the OP, people finding this question may be interested in checking if the version is equal to are newer than a specific release for compatibility reasons with different versions of Eigen. This can be done more easily using the EIGEN_VERSION_AT_LEAST(x, y, z) macro as follows:

#if EIGEN_VERSION_AT_LEAST(3,3,0)
    // Implementation for Eigen 3.3.0 and newer
#else
    // Implementation for older Eigen versions
#endif

This macro is also defined in Eigen/src/Core/util/Macros.h and uses EIGEN_WORLD_VERSION, EIGEN_MAJOR_VERSION and EIGEN_MINOR_VERSION internally.

来源：https://stackoverflow.com/questions/21497064/how-to-check-the-version-number-of-eigen-c-template-library

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c++

eigen