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namespace Eigen {
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/** \page TopicCustomizing_InheritingMatrix Inheriting from Matrix
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Before inheriting from Matrix, be really, I mean REALLY, sure that using
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EIGEN_MATRIX_PLUGIN is not what you really want (see previous section).
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If you just need to add few members to Matrix, this is the way to go.
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An example of when you actually need to inherit Matrix, is when you
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have several layers of heritage such as
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MyVerySpecificVector1, MyVerySpecificVector2 -> MyVector1 -> Matrix and
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MyVerySpecificVector3, MyVerySpecificVector4 -> MyVector2 -> Matrix.
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In order for your object to work within the %Eigen framework, you need to
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define a few members in your inherited class.
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Here is a minimalistic example:
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\include CustomizingEigen_Inheritance.cpp
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Output: \verbinclude CustomizingEigen_Inheritance.out
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This is the kind of error you can get if you don't provide those methods
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\verbatim
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error: no match for ‘operator=’ in ‘v = Eigen::operator*(
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const Eigen::MatrixBase<Eigen::Matrix<double, -0x000000001, 1, 0, -0x000000001, 1> >::Scalar&,
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const Eigen::MatrixBase<Eigen::Matrix<double, -0x000000001, 1> >::StorageBaseType&)
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(((const Eigen::MatrixBase<Eigen::Matrix<double, -0x000000001, 1> >::StorageBaseType&)
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((const Eigen::MatrixBase<Eigen::Matrix<double, -0x000000001, 1> >::StorageBaseType*)(& v))))’
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\endverbatim
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*/
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}
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