operator<= (<valarray>)

아티클
07/29/2015

Tests whether the elements of one valarray are less than or equal to the elements of an equally sized valarray or whether all the elements of a valarray are greater than or equal to or less than or equal to 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 compared or a specified value to be compared with each element of a valarray.
_Right
The second of the two valarrays whose elements are to be compared or a specified value to be compared with each element of a valarray.

Return Value

A valarray of Boolean values, each of which is:

true if the _Left element or value is less than or equal to the corresponding _Right element or value.
false if the _Left element or value is greater than the corresponding _Right element or value.

Remarks

If the number of elements two valarrays is not equal, the result is undefined.

Example

// valarray_op_le.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 - 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;

   vaNE = ( vaL <= vaR );
   cout << "The element-by-element result of "
        << "the less than or equal 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: ( -1 0 1 2 3 4 5 6 7 8 ).
The element-by-element result of the less than or equal test is the
 valarray: ( 0 0 1 0 1 0 1 0 1 0 ).

Requirements

Header: <valarray>

Namespace: std

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