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