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operator== (multimap)

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

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

_Left

An object of type multimap.

_Right

An object of type multimap.

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

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

// multimap_op_eq.cpp
// compile with: /EHsc
#include <map>
#include <iostream>

int main( )
{
   using namespace std;
   multimap<int, int> m1, m2, m3;
   int i;
   typedef pair<int, int> Int_Pair;

   for (i = 0; i < 3; i++)
   {
      m1.insert(Int_Pair(i, i));
      m2.insert(Int_Pair(i, i*i));
      m3.insert(Int_Pair(i, i));
   }

   if ( m1 == m2 )
      cout << "m1 and m2 are equal" << endl;
   else
      cout << "m1 and m2 are not equal" << endl;

   if ( m1 == m3 )
      cout << "m1 and m3 are equal" << endl;
   else
      cout << "m1 and m3 are not equal" << endl;
}
m1 and m2 are not equal
m1 and m3 are equal

Header: <map>

Namespace: std

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