operator< (set)
Tests if the set object on the left side of the operator is less than the set object on the right side.
bool operator<(
const set <Key, Traits, Allocator>& _Left,
const set <Key, Traits, Allocator>& _Right
);
Parameters
_Left
An object of type set._Right
An object of type set.
Return Value
true if the set on the left side of the operator is strictly less than the set on the right side of the operator; otherwise false.
Remarks
The comparison between set 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
// set_op_lt.cpp
// compile with: /EHsc
#include <set>
#include <iostream>
int main( )
{
using namespace std;
set <int> s1, s2, s3;
int i;
for ( i = 0 ; i < 3 ; i++ )
{
s1.insert ( i );
s2.insert ( i * i );
s3.insert ( i - 1 );
}
if ( s1 < s2 )
cout << "The set s1 is less than the set s2." << endl;
else
cout << "The set s1 is not less than the set s2." << endl;
if ( s1 < s3 )
cout << "The set s1 is less than the set s3." << endl;
else
cout << "The set s1 is not less than the set s3." << endl;
}
The set s1 is less than the set s2.
The set s1 is not less than the set s3.
Requirements
Header: <set>
Namespace: std