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https://gitlab.com/libeigen/eigen.git
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3036eeca0a
release of tvmet (inactive for 2 years and developer unreachable) as the basis for eigen2, because it provides seemingly good expression template mechanisms, we want that, and it would take years to reinvent that wheel. We'll see. So this commit imports the last tvmet release.
68 lines
1.3 KiB
C++
68 lines
1.3 KiB
C++
/*
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* $Id: Identity.h,v 1.3 2004/09/16 09:14:18 opetzold Exp $
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*/
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#ifndef TVMET_XPR_IDENTITY_H
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#define TVMET_XPR_IDENTITY_H
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namespace tvmet {
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/**
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* \class XprIdentity Identity.h "tvmet/xpr/Identity.h"
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* \brief Expression for the identity matrix.
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*
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* This expression doesn't hold any other expression, it
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* simply returns 1 or 0 depends where the row and column
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* element excess is done.
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*
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* \since release 1.6.0
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* \sa identity
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*/
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template<class T, std::size_t Rows, std::size_t Cols>
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struct XprIdentity
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: public TvmetBase< XprIdentity<T, Rows, Cols> >
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{
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XprIdentity& operator=(const XprIdentity&);
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public:
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typedef T value_type;
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public:
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/** Complexity counter. */
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enum {
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ops_assign = Rows * Cols,
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ops = ops_assign
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};
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public:
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/** access by index. */
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value_type operator()(std::size_t i, std::size_t j) const {
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return i==j ? 1 : 0;
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}
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public: // debugging Xpr parse tree
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void print_xpr(std::ostream& os, std::size_t l=0) const {
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os << IndentLevel(l++)
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<< "XprIdentity[O="<< ops << ")]<"
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<< std::endl;
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os << IndentLevel(l)
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<< typeid(T).name() << ","
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<< "R=" << Rows << ", C=" << Cols << std::endl;
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os << IndentLevel(--l) << ">"
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<< ((l != 0) ? "," : "") << std::endl;
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}
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};
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} // namespace tvmet
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#endif // TVMET_XPR_IDENTITY_H
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// Local Variables:
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// mode:C++
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// End:
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