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Showing content from https://www.tutorialspoint.com/cpp_standard_library/cpp_multimap_operator_less_than.htm below:

C++ Map Library - operator< Function

The C++ function std::multimap::operator< tests whether first multimap is less than other or not.

Operator < compares element sequentially and comparison stops at first mismatch.

Following is the declaration for std::multimap::operator

template <class Key, class T, class Compare, class Alloc>
bool operator< ( const multimap<Key,T,Compare,Alloc>& m1,
                  const multimap<Key,T,Compare,Alloc>& m2);

• m1 − First multimap object.

• m2 − Second multimap object.

Returns true if first multimap is less than second otherwise false.

No effect on container if exception is thrown.

Linear i.e. O(n)

The following example shows the usage of std::multimap::operator< function.

#include <iostream>
#include <map>

using namespace std;

int main(void) {
   /* Multimap with duplicates */
   multimap<char, int> m1;
   multimap<char, int> m2;

   m2.insert(pair<char, int>('a', 1));

   if (m1 < m2)
      cout << "m1 multimap is less than m2." << endl;

   m1 = m2;

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

   return 0;
}

Let us compile and run the above program, this will produce the following result −

m1 multimap is less than m2.
m1 multimap is not less than m2.

map.htm

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