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valarray::shift

Shifts all the elements in a valarray by a specified number of places.

valarray<Type> shift(
   int _Count
) const;

Parameters

  • _Count
    The number of places the elements are to be shifted forward.

Return Value

A new valarray in which all the elements have been moved _Count positions toward the front of the valarray, left with respect to their positions in the operand valarray.

Remarks

A positive value of _Count shifts the elements left _Count places, with zero fill.

A negative value of _Count shifts the elements right _Count places, with zero fill.

Example

// valarray_shift.cpp
// compile with: /EHsc
#include <valarray>
#include <iostream>

int main( )
{
   using namespace std;
   int i;

   valarray<int> va1 ( 10 ), va2 ( 10 );
   for ( i = 0 ; i < 10 ; i += 1 )
      va1 [ i ] =  i;
   for ( i = 0 ; i < 10 ; i += 1 )
      va2 [ i ] = 10 -  i;

   cout << "The operand valarray va1(10) is: ( ";
      for ( i = 0 ; i < 10 ; i++ )
         cout << va1 [ i ] << " ";
   cout << ")." << endl;

   // A positive parameter shifts elements left
   va1 = va1.shift ( 4 );
   cout << "The shifted valarray va1 is: va1.shift (4) = ( ";
      for ( i = 0 ; i < 10 ; i++ )
         cout << va1 [ i ] << " ";
   cout << ")." << endl;

   cout << "The operand valarray va2(10) is: ( ";
      for ( i = 0 ; i < 10 ; i++ )
         cout << va2 [ i ] << " ";
   cout << ")." << endl;

   // A negative parameter shifts elements right
   va2 = va2.shift ( - 4 );
   cout << "The shifted valarray va2 is: va2.shift (-4) = ( ";
      for ( i = 0 ; i < 10 ; i++ )
         cout << va2 [ i ] << " ";
   cout << ")." << endl;
}
The operand valarray va1(10) is: ( 0 1 2 3 4 5 6 7 8 9 ).
The shifted valarray va1 is: va1.shift (4) = ( 4 5 6 7 8 9 0 0 0 0 ).
The operand valarray va2(10) is: ( 10 9 8 7 6 5 4 3 2 1 ).
The shifted valarray va2 is: va2.shift (-4) = ( 0 0 0 0 10 9 8 7 6 5 ).

Requirements

Header: <valarray>

Namespace: std

See Also

Reference

valarray Class

Other Resources

valarray Members