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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.
155 lines
3.8 KiB
C++
155 lines
3.8 KiB
C++
/*
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* Tiny Vector Matrix Library
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* Dense Vector Matrix Libary of Tiny size using Expression Templates
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*
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* Copyright (C) 2001 - 2003 Olaf Petzold <opetzold@users.sourceforge.net>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* lesser General Public License for more details.
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*
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* You should have received a copy of the GNU lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* $Id: Vector.h,v 1.20 2004/09/16 09:14:18 opetzold Exp $
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*/
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#ifndef TVMET_META_VECTOR_H
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#define TVMET_META_VECTOR_H
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#include <tvmet/NumericTraits.h>
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#include <tvmet/xpr/Null.h>
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namespace tvmet {
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/* forwards */
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template<class T, int Sz> class Vector;
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namespace meta {
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/**
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* \class Vector Vector.h "tvmet/meta/Vector.h"
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* \brief Meta %Vector class using expression templates
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*/
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template<int Sz, int K=0>
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class Vector
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{
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Vector();
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Vector(const Vector&);
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Vector& operator=(const Vector&);
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private:
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enum {
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doIt = (K < (Sz-1)) ? 1 : 0 /**< recursive counter */
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};
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public:
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/** assign an expression expr using the functional assign_fn. */
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template <class Dest, class Src, class Assign>
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static inline
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void assign(Dest& lhs, const Src& rhs, const Assign& assign_fn) {
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assign_fn.apply_on(lhs(K), rhs(K));
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meta::Vector<Sz * doIt, (K+1) * doIt>::assign(lhs, rhs, assign_fn);
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}
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/** build the sum of the vector. */
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template<class E>
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static inline
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typename E::value_type
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sum(const E& e) {
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return e(K) + meta::Vector<Sz * doIt, (K+1) * doIt>::sum(e);
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}
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/** build the product of the vector. */
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template<class E>
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static inline
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typename NumericTraits<
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typename E::value_type
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>::sum_type
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product(const E& e) {
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return e(K) * meta::Vector<Sz * doIt, (K+1) * doIt>::product(e);
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}
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/** build the dot product of the vector. */
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template<class Dest, class Src>
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static inline
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typename PromoteTraits<
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typename Dest::value_type,
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typename Src::value_type
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>::value_type
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dot(const Dest& lhs, const Src& rhs) {
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return lhs(K) * rhs(K)
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+ meta::Vector<Sz * doIt, (K+1) * doIt>::dot(lhs, rhs);
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}
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/** check for all elements */
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template<class E>
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static inline
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bool
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all_elements(const E& e) {
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if(!e(K)) return false;
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return meta::Vector<Sz * doIt, (K+1) * doIt>::all_elements(e);
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}
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/** check for any elements */
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template<class E>
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static inline
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bool
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any_elements(const E& e) {
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if(e(K)) return true;
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return meta::Vector<Sz * doIt, (K+1) * doIt>::any_elements(e);
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}
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};
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/**
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* \class Vector<0,0> Vector.h "tvmet/meta/Vector.h"
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* \brief Meta %Vector Specialized for recursion
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*/
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template<>
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class Vector<0,0>
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{
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Vector();
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Vector(const Vector&);
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Vector& operator=(const Vector&);
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public:
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template <class Dest, class Src, class Assign>
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static inline void assign(Dest&, const Src&, const Assign&) { }
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template<class E>
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static inline XprNull sum(const E&) { return XprNull(); }
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template<class E>
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static inline XprNull product(const E&) { return XprNull(); }
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template<class Dest, class Src>
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static inline XprNull dot(const Dest&, const Src&) { return XprNull(); }
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template<class E>
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static inline bool all_elements(const E&) { return true; }
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template<class E>
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static inline bool any_elements(const E&) { return false; }
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};
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} // namespace meta
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} // namespace tvmet
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#endif /* TVMET_META_VECTOR_H */
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// Local Variables:
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// mode:C++
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// End:
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