The C++ function std::unordered_multimap::operator=() assigns new contents to the unordered_multimap by replacing old ones and modifies size if necessary.
Following is the declaration for std::unordered_multimap::operator=() function form std::unordered_map() header.
unordered_multimap& operator=(const unordered_multimap& umm);
umm − Another unordered_multimap object of same type.
Returns this pointer.
Linear i.e. O(n)
The following example shows the usage of std::unordered_multimap::operator=() 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; 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