NAME¶

std::unordered_map::reserve - std::unordered_map::reserve

Synopsis¶

void reserve( size_type count ); (since C++11)

Sets the number of buckets to the number needed to accommodate at least count
elements without exceeding maximum load factor and rehashes the container, i.e. puts
the elements into appropriate buckets considering that total number of buckets has
changed. Effectively calls rehash(std::ceil(count / max_load_factor())).

Parameters¶

count - new capacity of the container

Return value¶

(none)

Complexity¶

Average case linear in the size of the container, worst case quadratic.

See also¶

reserves at least the specified number of buckets and regenerates the hash
rehash table
(public member function)