1 line
No EOL
3.6 KiB
C
Executable file
1 line
No EOL
3.6 KiB
C
Executable file
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/*+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*/
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/* */
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/* */
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/* MV++ Numerical Matrix/Vector C++ Library */
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/* MV++ Version 1.5 */
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/* */
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/* R. Pozo */
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/* National Institute of Standards and Technology */
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/* */
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/* NOTICE */
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/* */
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/* Permission to use, copy, modify, and distribute this software and */
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/* its documentation for any purpose and without fee is hereby granted */
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/* provided that this permission notice appear in all copies and */
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/* supporting documentation. */
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/* */
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/* Neither the Institution (National Institute of Standards and Technology) */
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/* nor the author makes any representations about the suitability of this */
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/* software for any purpose. This software is provided ``as is''without */
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/* expressed or implied warranty. */
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/* */
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/*+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*/
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//
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// mvvind.h MV_Vector Index class
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#ifndef _MV_VEC_INDEX_H_
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#define _MV_VEC_INDEX_H_
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// A MV_VecIndex is an ordered pair (start,end) denoting a subvector
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// region, similar to a Fortran 90 or Matlab colon notation. For example,
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//
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// MV_Vector_double A(10), B(20);
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// MV_VecIndex I(2,4);
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//
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// A(I) = B(MV_VecIndex(0,2);
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//
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// sets the thrid through fifth elements of A to the first two elements
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// of B. There is no stride argument, only contiguous regions are allowed.
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//
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#include <assert.h>
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class MV_VecIndex
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{
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private:
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unsigned int start_;
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unsigned int end_;
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char all_; // true if this index refers to the complete
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// vector range. start_ and end_ are ignored.
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public:
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MV_VecIndex() : start_(0), end_(0), all_(1) {}
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MV_VecIndex(unsigned int i1) :start_(i1), end_(i1), all_(0) {}
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MV_VecIndex(unsigned int i1, unsigned int i2): start_(i1), end_(i2),
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all_(0)
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{
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assert(i1 <= i2);
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}
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MV_VecIndex(const MV_VecIndex &s) : start_(s.start_), end_(s.end_),
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all_(s.all_){}
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int start() const { return (all_==1) ? 0 : start_;}
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int end() const { return (all_ ==1) ? 0 : end_;}
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int length() const {
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return (all_==1) ? 0 : (end_-start_+1);}
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int all() const { return all_; }
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MV_VecIndex& operator=(const MV_VecIndex& I)
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{ start_=I.start_; end_ = I.end_; return *this;}
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MV_VecIndex operator+(int i)
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{ return MV_VecIndex(start_ +i, end_ +i); }
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MV_VecIndex& operator+=(int i)
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{ start_ += i; end_ += i; return *this; }
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MV_VecIndex operator-(int i)
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{ return MV_VecIndex(start_ -i, end_ -i); }
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MV_VecIndex& operator-=(int i)
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{ start_ -= i; end_ -= i; return *this; }
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};
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#endif
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// _INDEX_H_
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