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