eigen/doc/examples/make_circulant.cpp.expression

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template <class ArgType>
class Circulant : public Eigen::MatrixBase<Circulant<ArgType> > {
public:
Circulant(const ArgType& arg) : m_arg(arg) {
EIGEN_STATIC_ASSERT(ArgType::ColsAtCompileTime == 1, YOU_TRIED_CALLING_A_VECTOR_METHOD_ON_A_MATRIX);
}
typedef typename Eigen::internal::ref_selector<Circulant>::type Nested;
typedef Eigen::Index Index;
Index rows() const { return m_arg.rows(); }
Index cols() const { return m_arg.rows(); }
typedef typename Eigen::internal::ref_selector<ArgType>::type ArgTypeNested;
ArgTypeNested m_arg;
};