Export (0) Print
Expand All

operator== (hash_set)

Note Note

This API is obsolete. The alternative is unordered_set Class.

Tests if the hash_set object on the left side of the operator is equal to the hash_set object on the right side.

bool operator!==( 
   const hash_set <Key, Traits, Allocator>& _Left, 
   const hash_set <Key, Traits, Allocator>& _Right 
);

_Left

An object of type hash_set.

_Right

An object of type hash_set.

true if the hash_set on the left side of the operator is equal to the hash_set on the right side of the operator; otherwise false.

The comparison between hash_set objects is based on a pairwise comparison of their elements. Two hash_sets are equal if they have the same number of elements and their respective elements have the same values. Otherwise, they are unequal.

In Visual C++ .NET 2003, members of the <hash_map> and <hash_set> header files are no longer in the std namespace, but rather have been moved into the stdext namespace. See The stdext Namespace for more information.

// hash_set_op_eq.cpp
// compile with: /EHsc
#include <hash_set>
#include <iostream>

int main( )
{
   using namespace std;
   using namespace stdext;
   hash_set <int> s1, s2, s3;
   int i;

   for ( i = 0 ; i < 3 ; i++ )
   {
      s1.insert ( i );
      s2.insert ( i * i );
      s3.insert ( i );
   }

   if ( s1 == s2 )
      cout << "The hash_sets s1 and s2 are equal." << endl;
   else
      cout << "The hash_sets s1 and s2 are not equal." << endl;

   if ( s1 == s3 )
      cout << "The hash_sets s1 and s3 are equal." << endl;
   else
      cout << "The hash_sets s1 and s3 are not equal." << endl;
}
The hash_sets s1 and s2 are not equal.
The hash_sets s1 and s3 are equal.

Header: <hash_set>

Namespace: stdext

Show:
© 2015 Microsoft