operator!= (<valarray>)

發行項
07/29/2015

Tests whether the corresponding elements of two equally sized valarrays are unequal or whether all the elements of a valarray are unequal a specified value.

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

Parameters

_Left
The first of the two valarrays whose elements are to be tested for inequality.
_Right
The second of the two valarrays whose elements are to be tested for inequality.

Return Value

A valarray of Boolean values, each of which is:

true if the corresponding elements are unequal.
false if the corresponding elements are not unequal.

Remarks

The first template operator returns an object of class valarray<bool>, each of whose elements I is _Left[I] != _Right[I].

The second template operator stores in element I _Left[I] != _Right.

The third template operator stores in element I _Left != _Right[I].

Example

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

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

   valarray<int> vaL ( 10 ), vaR ( 10 );
   valarray<bool> vaNE ( 10 );
   for ( i = 0 ; i < 10 ; i += 2 )
      vaL [ i ] =  -i;
   for ( i = 1 ; i < 10 ; i += 2 )
      vaL [ i ] =  i;
   for ( i = 0 ; i < 10 ; i++ )
      vaR [ i ] =  i;
   
   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;

   vaNE = ( vaL != vaR );
   cout << "The element-by-element result of "
        << "the not equal comparison test is the\n valarray: ( ";
      for ( i = 0 ; i < 10 ; i++ )
         cout << vaNE [ i ] << " ";
   cout << ")." << endl;
}

The initial Left valarray is: ( 0 1 -2 3 -4 5 -6 7 -8 9 ).
The initial Right valarray is: ( 0 1 2 3 4 5 6 7 8 9 ).
The element-by-element result of the not equal comparison test is the
 valarray: ( 0 0 1 0 1 0 1 0 1 0 ).

Requirements

Header: <valarray>

Namespace: std

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