The std::unordered_map::rehash() is a built in function C++ STL which which sets the number of buckets in container to n or more.
void rehash( size_type s );
- If s is greater than the current buckets into the container then rehashed is done. The new bucket count can be greater than or equal to n.
- If s is less than current bucket count then there may or may not be any effect of function. It totally depends upon compiler
Parameters : It takes New number of buckets into the container.
Return type : Its return type is none.
Size of container : 3 Initial bucket count : 5 Size of container : 3 Now bucket count is : 31
Size of container : 4 Initial bucket count : 7 Size of container : 4 Now bucket count is : 23
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