The C++ function std::unordered_multimap::unordered_multimap() constructs an unordered_multimap with the contents of other using move semantics.
Following is the declaration for std::unordered_multimap::unordered_multimap() function form std::unordered_map() header.
unordered_multimap(unordered_multimap&& umm);
umm − Another unordered_multimap object of same type.
Constructor never returns value.
Constant i.e. O(1)
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