What are the advanced features of unordered_map in C++11?
C++11 introduced several advanced features for unordered_map, such as improved performance, custom hash functions, and better memory management.
Can you explain how custom hash functions work with unordered_map?
Sure! You can define a custom hash function by creating a struct that overloads the operator() and then pass it as a template argument to unordered_map.
What are the performance benefits of using unordered_map over map?
unordered_map offers average constant time complexity for insertions and lookups, while map has logarithmic time complexity due to its underlying tree structure.
Are there any limitations to using unordered_map?
Yes, unordered_map does not maintain the order of elements, and it requires a good hash function to minimize collisions for optimal performance.
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