What is the memory usage of unordered_map in C++11?
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What is the memory usage of unordered_map in C++11?
In C++11, an unordered_map typically uses more memory than a standard map due to its hash table implementation. The memory usage depends on the number of elements and the load factor.
How does the load factor affect memory usage?
The load factor is the ratio of the number of elements to the number of buckets. A higher load factor means less memory usage but can lead to more collisions, affecting performance.
What is the default load factor in unordered_map?
The default load factor in unordered_map is 1.0, meaning that the number of elements should not exceed the number of buckets.
Can I change the load factor?
Yes, you can change the load factor by using the max_load_factor() method to set a new value.
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