operator|

Artikel
07/29/2015

Obtains the bitwise OR between corresponding elements of two equally sized valarrays or between a valarray and a specified value of the element type.

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 first of the two valarrays whose respective elements are to be combined with the bitwise OR or a specified value of the element type to be combined bitwise with each element of a valarray.
_Right
The second of the two valarrays whose respective elements are to be combined with the bitwise OR or a specified value of the element type to be combined bitwise with each element of a valarray.

Return Value

A valarray whose elements are the element-wise combination of the bitwise OR operation of _Left and _Right.

Remarks

A bitwise operation can only be used to manipulate bits in char and int data types and variants and not on float, double, long double, void, bool or other, more complex data types.

The bitwise OR has the same truth table as the logical OR, but applies to the data type on the level of the individual bits. Given bits b1 and b2, b1 OR b2 is true if at least one of the bits is true or false if both bits are false. The logical OR operator|| applies on an element level, counting all nonzero values as true, and the result is a valarray of Boolean values. The bitwise OR operator|, by contrast, can result in a valarray of values other than 0 or 1, depending on the outcome of the bitwise operation.

Example

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

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

   valarray<int> vaL ( 10 ), vaR ( 10 );
   valarray<int> vaLAA ( 10 );
   for ( i = 0 ; i < 10 ; i += 2 )
      vaL [ i ] =  1;
   for ( i = 1 ; i < 10 ; i += 2 )
      vaL [ i ] =  0;
   for ( i = 0 ; i < 10 ; i += 3 )
      vaR [ i ] =  i;
   for ( i = 1 ; i < 10 ; i += 3 )
      vaR [ i ] =  i-1;
   for ( i = 2 ; i < 10 ; i += 3 )
      vaR [ i ] =  i-1;
   
   cout << "The initial Left valarray is:  ( ";
      for (i = 0 ; i < 10 ; i++ )
         cout << vaL [ i ] << " ";
   cout << ")." << endl;

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

   vaLAA = ( vaL | vaR );
   cout << "The element-by-element result of "
        << "the bitwise OR operator| is the\n valarray: ( ";
      for (i = 0 ; i < 10 ; i++ )
         cout << vaLAA [ i ] << " ";
   cout << ")." << endl;
}

The initial Left valarray is:  ( 1 0 1 0 1 0 1 0 1 0 ).
The initial Right valarray is: ( 0 0 1 3 3 4 6 6 7 9 ).
The element-by-element result of the bitwise OR operator| is the
 valarray: ( 1 0 1 3 3 4 7 6 7 9 ).

Requirements

Header: <valarray>

Namespace: std

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