C++ Unordered_multimap Library - unordered_multimap() Function

Description

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

Declaration

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

C++11

unordered_multimap(unordered_multimap&& umm);

Parameters

umm − Another unordered_multimap object of same type.

Return value

Constructor never returns value.

Time complexity

Constant i.e. O(1)

Example

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(move(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