operator< (multimap)

Tests if the multimap object on the left side of the operator is less than 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 strictly less than 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. The less-than relationship between two objects is based on a comparison of the first pair of unequal elements.

// multimap_op_lt.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 = 1 ; i < 3 ; i++ )
   {
      m1.insert ( Int_Pair ( i, i ) );
      m2.insert ( Int_Pair ( i, i * i ) );
      m3.insert ( Int_Pair ( i, i - 1 ) );
   }

   if ( m1 < m2 )
      cout << "The multimap m1 is less than the multimap m2." << endl;
   else
      cout << "The multimap m1 is not less than the multimap m2." << endl;

   if ( m1 < m3 )
      cout << "The multimap m1 is less than the multimap m3." << endl;
   else
      cout << "The multimap m1 is not less than the multimap m3." << endl;
}
The multimap m1 is less than the multimap m2.
The multimap m1 is not less than the multimap m3.

Header: <map>

Namespace: std

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