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C++ Map Library - multimap() Function

The C++ function std::multimap::multimap() constructs a multimap with the contents of other using move semantics.

Following is the declaration for std::multimap::multimap() function form std::map header.

multimap (multimap&& other);
multimap (multimap&& other, const allocator_type& alloc);

• other − Another multimap object of same type.

• alloc − The allocator object.

Constructor never return value.

No effect on container if exception is thrown.

Linear i.e. O(n)

The following example shows the usage of std::multimap::multimap() function.

#include <iostream>
#include <map>

using namespace std;

int main(void) {
   /* Multimap with duplicates */
   multimap<char, int> m1 = {
         {'a', 1},
         {'a', 2},
         {'b', 3},
         {'c', 4},
         {'c', 5},
               };

   multimap<char, int>m2(move(m1));

   cout << "Multimap contains following elements:" << endl;

   for (auto it = m2.begin(); it != m2.end(); ++it)
      cout << it->first << " = " << it->second << endl;

   return 0;
}

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

Multimap contains following elements:
a = 1
a = 2
b = 3
c = 4
c = 5

map.htm

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