operator>> (<valarray>)

Artikel
07/29/2015

Right-shifts the bits for each element of a valarray a specified number of positions or by an element-wise amount specified by a second valarray.

template<class Type>
   valarray<Type> operator>>(
      const valarray<Type>& _Left,
      const valarray<Type>& _Right
   );
template<class Type>
   valarray<Type> operator>>(
      const valarray<Type>& _Left,
      const Type& _Right
  );
template<class Type>
   valarray<Type> operator>>(
      const Type& _Left,
      const valarray<Type>& _Right
   );

Parameters

_Left
The value to be shifted or the valarray whose elements are to be shifted.
_Right
The value indicating the amount of right shift or valarray whose elements indicate the element-wise amount of right shift.

Return Value

A valarray whose elements have been shifted right by the specified amount.

Remarks

Signed numbers have their signs preserved.

Example

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

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

   valarray<int> vaL ( 8 ), vaR ( 8 );
   valarray<int> vaNE ( 8 );
   for ( i = 0 ; i < 8 ; i += 2 )
      vaL [ i ] =  64;
   for ( i = 1 ; i < 8 ; i += 2 )
      vaL [ i ] =  -64;
   for ( i = 0 ; i < 8 ; i++ )
      vaR [ i ] =  i;
   
   cout << "The initial Left valarray is: ( ";
      for ( i = 0 ; i < 8 ; i++ )
         cout << vaL [ i ] << " ";
   cout << ")." << endl;

   cout << "The initial Right valarray is: ( ";
      for ( i = 0 ; i < 8 ; i++ )
         cout << vaR [ i ] << " ";
   cout << ")." << endl;

   vaNE = ( vaL >> vaR );
   cout << "The element-by-element result of "
        << "the right shift is the\n valarray: ( ";
      for ( i = 0 ; i < 8 ; i++ )
         cout << vaNE [ i ] << " ";
   cout << ")." << endl;
}

The initial Left valarray is: ( 64 -64 64 -64 64 -64 64 -64 ).
The initial Right valarray is: ( 0 1 2 3 4 5 6 7 ).
The element-by-element result of the right shift is the
 valarray: ( 64 -32 16 -8 4 -2 1 -1 ).

Requirements

Header: <valarray>

Namespace: std

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