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6d749c172a
The size_t type means a number of _bytes_, and it was misused as counting e.g. the number of rows/columns in a matrix. Moreover, it is unsigned, which can give strange bugs if a signed/unsigned mismatch occurs.
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, int Rows, int 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()(int i, int 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, int 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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