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C++ Unordered Multimap Copy Constructor

The C++ function std::unordered_multimap::unordered_multimap() constructs an unordered_multimap with copy of each elements present in existing unordered_multimap.

Following is the declaration for std::unordered_multimap::unordered_multimap() function form std::unordered_map() header.

unordered_multimap (const unordered_multimap& umm);

umm − Another unordered_multimap object.

Constructor never returns value.

Linear i.e. O(n) in average case.

Quadratic i.e. O(n²) in worst case.

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

#include <iostream>
#include <unordered_map>

using namespace std;

int main(void) {
   unordered_multimap<char, int> umm1 = {
            {'a', 1},
            {'b', 2},
            {'c', 3},
            {'d', 4},
            {'e', 5}
            };
   unordered_multimap<char, int> umm2(umm1);

   cout << "Unordered multimap contains following elements" << endl;

   for (auto it = umm2.begin(); it != umm2.end(); ++it)
      cout << it->first << " = " << it->second << endl;

   return 0;
}

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

Unordered multimap contains following elements
e = 5
a = 1
b = 2
c = 3
d = 4

unordered_map.htm

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