为什么 operator+ 对于 rowwise Eigen 数组不是可交换的？

如何解决为什么 operator+ 对于 rowwise Eigen 数组不是可交换的？

给定两个特征数组：

Eigen::Array<double,1,2> m(1);
Eigen::Array<double,3,2> n(2);

为什么 n.rowwise() + m; 可以编译，而 m + n.rowwise(); 不能？

这是一个显示编译错误的 demonstration with Compiler Explorer，其中包括

invalid operands to binary expression ('Eigen::Array<double,2>' and 'Eigen::DenseBase<Eigen::Array<double,2,2>>::RowwiseReturnType' (aka 'VectorwiSEOp<Eigen::Array<double,2>,Horizontal>'))
    m + n.rowwise(); // does not compile
    ~ ^ ~~~~~~~~~~~
[...]/Eigen/src/Core/../plugins/ArrayCwiseBinaryOps.h:241:29: note: candidate function template not viable: no kNown conversion from 'Eigen::DenseBase<Eigen::Array<double,Horizontal>') to 'const Eigen::ArrayBase<Eigen::Array<double,2>>::StorageBaseType' (aka 'const Eigen::ArrayBase<Eigen::Array<double,2>>') for 2nd argument
[...]/Eigen/src/Core/../plugins/ArrayCwiseBinaryOps.h:241:29: note: candidate function template not viable: no kNown conversion from 'Eigen::DenseBase<Eigen::Array<double,2>>') for 2nd argument
[...]/Eigen/src/Core/../plugins/CommonCwiseBinaryOps.h:27:28: note: candidate template ignored: Could not match 'ArrayBase' against 'VectorwiSEOp'
[...]/Eigen/src/Core/../plugins/ArrayCwiseBinaryOps.h:241:29: note: candidate template ignored: substitution failure [with T = Eigen::VectorwiSEOp<Eigen::Array<double,1>]: no type named 'type' in 'Eigen::internal::promote_scalar_arg<double,Eigen::VectorwiSEOp<Eigen::Array<double,1>,false>'

第一个表达式使用的 operator+ 是编译的表达式，它是 on this line of VectorwiseOp.h。