Understanding C++11 Unordered Map Iterators

Can you explain what an unordered map is in C++11?

An unordered map in C++11 is a hash table-based container that stores key-value pairs with no specific order.

How do I iterate over an unordered map?

You can use iterators to traverse an unordered map. For example, you can use a for loop with begin() and end() methods.

Can you show me a code example of iterating through an unordered map?

Sure! Here's a simple example:

#include <iostream>
#include <unordered_map>

int main() {
    std::unordered_map<int, std::string> myMap = {{1, "one"}, {2, "two"}, {3, "three"}};
    for (const auto& pair : myMap) {
        std::cout << pair.first << " : " << pair.second << std::endl;
    }
    return 0;
}

What are the advantages of using unordered maps over ordered maps?

Unordered maps provide average constant time complexity for insertions and lookups, making them faster than ordered maps for these operations.