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
);
Parameters
_Left
An object of type multimap._Right
An object of type multimap.
Return Value
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.
Remarks
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.
Example
// 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.
Requirements
Header: <map>
Namespace: std