The C++ function std::unordered_multimap::operator=() copy elements from initializer list to unordered_multimap.
Following is the declaration for std::unordered_multimap::operator=() function form std::unordered_map() header.
unordered_multimap& operator=(intitializer_list<value_type> il);
il − Initialize list.
Returns this pointer.
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::operator=() function.
#include <iostream> #include <unordered_map> using namespace std; int main(void) { unordered_multimap<char, int> umm; umm = { {'a', 1}, {'b', 2}, {'c', 3}, {'d', 4}, {'e', 5}, }; cout << "Unordered multimap contains following elements" << endl; for (auto it = umm.begin(); it != umm.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 d = 4 c = 3 b = 2 a = 1