Rotate.h

//     ____   ______ __
//    / __ \ / ____// /
//   / /_/ // /    / /
//  / ____// /___ / /___   PixInsight Class Library
// /_/     \____//_____/   PCL 2.8.5
// ----------------------------------------------------------------------------
// pcl/Rotate.h - Released 2024-12-28T16:53:48Z
// ----------------------------------------------------------------------------
// This file is part of the PixInsight Class Library (PCL).
// PCL is a multiplatform C++ framework for development of PixInsight modules.
//
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// modification, is permitted provided that the following conditions are met:
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// POSSIBILITY OF SUCH DAMAGE.
// ----------------------------------------------------------------------------
 
#ifndef __PCL_Rotate_h
#define __PCL_Rotate_h
 
#include <pcl/Defs.h>
 
#include <pcl/Iterator.h>
#include <pcl/Utility.h>
 
// Template formal parameters:
//
// FI   Forward iterator
// BI   Bidirectional iterator
// RI   Random access iterator
// UP   Unary predicate
// BP   Binary predicate
// T    Item type
// F    Function
 
// ### TODO: Document this file.
 
namespace pcl
{
 
// ----------------------------------------------------------------------------
// void Reverse( BI, BI )
// ----------------------------------------------------------------------------
 
template <class BI> inline
void Reverse( BI i, BI j )
{
   __reverse__( i, j, IteratorClass( i ) );
}
 
template <class BI> inline
void __reverse__( BI i, BI j, BidirectionalIterator )
{
   for ( ; i != j && i != --j; ++i )
      Swap( *i, *j );
}
 
template <class RI> inline
void __reverse__( RI i, RI j, RandomAccessIterator )
{
   if ( i < j )
      for ( ; i < --j; ++i )
         Swap( *i, *j );
}
 
// ----------------------------------------------------------------------------
// void Rotate( FI, FI, FI )
// ----------------------------------------------------------------------------
 
template <class FI> inline
void Rotate( FI i, FI m, FI j )
{
   if ( m != i && m != j )
      __rotate__( i, m, j, IteratorClass( i ) );
}
 
template <class FI> inline
void __rotate__( FI i, FI m, FI j, ForwardIterator )
{
   for ( FI k = m; ; )
   {
      Swap( *i, *k );
      if ( ++i == m )
         if ( ++k == j )
            break;
         else
            m = k;
      else if ( ++k == j )
         k = m;
   }
}
 
template <class BI> inline
void __rotate__( BI i, BI m, BI j, BidirectionalIterator )
{
   Reverse( i, m );
   Reverse( m, j );
   Reverse( i, j );
}
 
template <class RI> inline
void __rotate__( RI i, RI m, RI j, RandomAccessIterator )
{
   __rotate_ri__( i, m, j, ItemType( i ) );
}
 
template <class RI, class T> inline
void __rotate_ri__( RI i, RI m, RI j, const T* )
{
   distance_type d = m-i;
   distance_type n = j-i;
 
   for ( distance_type a = d; a != 0; )
   {
      distance_type b = n % a;
      n = a;
      a = b;
   }
 
   if ( n < j-i )
      for ( ; 0 < n; --n )
      {
         RI x = i+n;
         RI y = x;
         RI z = y+d;
         if ( z == j )
            z = i;
 
         T v = *x;
 
         while ( z != x )
         {
            *y = *z;
            y = z;
            z = (d < j-z) ? z+d : i+(d-(j-z));
         }
 
         *y = v;
      }
}
 
// ----------------------------------------------------------------------------
// void Shift( FI, FI, FI, T )
// void ShiftLeft( FI, FI, FI, T )
// ----------------------------------------------------------------------------
 
template <class FI, class T> inline
void Shift( FI i, FI m, FI j, const T& v )
{
   if ( m != i )
   {
      for ( ; m != j; ++m, ++i )
         *i = *m;
      for ( ; i != j; ++i )
         *i = v;
   }
}
 
template <class FI, class T> inline
void ShiftLeft( FI i, FI m, FI j, const T& v )
{
   Shift( i, m, j, v );
}
 
// ----------------------------------------------------------------------------
// void ShiftRight( FI, FI, FI, T )
// ----------------------------------------------------------------------------
 
template <class FI, class T> inline
void ShiftRight( FI i, FI m, FI j, const T& v )
{
   if ( i != j && m != j )
      __shift_right__( i, m, j, v, IteratorClass( i ) );
}
 
template <class FI, class T> inline
void __shift_right__( FI i, FI m, FI j, const T& v, ForwardIterator )
{
   do
   {
      if ( m != i )
      {
         FI k = i;
         do
            Swap( *++k, *i );
         while ( k != m );
         *m = *i;
      }
 
      *i = v;
      ++i;
   }
   while ( ++m != j );
}
 
template <class BI, class T> inline
void __shift_right__( BI i, BI m, BI j, const T& v, BidirectionalIterator )
{
   while ( m != i )
      *--j = *--m;
   do
      *m = v;
   while ( ++m != j );
}
 
// ----------------------------------------------------------------------------
 
} // pcl
 
#endif  // __PCL_Rotate_h
 
// ----------------------------------------------------------------------------
// EOF pcl/Rotate.h - Released 2024-12-28T16:53:48Z