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valarray::operator<<= 

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


valarray<Type>& operator<<=(
   const valarray<Type>& _Right
);
valarray<Type>& operator<<=(
   const Type& _Right
);

Parameters

_Right

The value indicating the amount of left shift or valarray whose elements indicate the element-wise amount of left shift.

A valarray whose elements have been shifted left the amount specified in _Right.

Signed numbers have their signs preserved.

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

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

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

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

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

Output

The initial operand valarray is: ( 1 -1 1 -1 1 -1 1 -1 ).
The _Right valarray is: ( 0 1 2 3 4 5 6 7 ).
The element-by-element result of the left shift
 on the operand array is the valarray:
 ( 1 -2 4 -8 16 -32 64 -128 ).

Header: <valarray>

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